❤️ 健康健身Health & Fitness
BMI 计算器BMI Calculator
在线计算身体质量指数 BMI，按中国标准和 WHO 标准判断偏瘦、正常、超重或肥胖。Calculate Body Mass Index and see your weight category.
基础代谢率 BMR 计算器BMR Calculator
用 Mifflin-St Jeor 公式计算基础代谢率（每天静息消耗的热量）。Calculate your basal metabolic rate with the Mifflin-St Jeor equation.
每日热量需求 TDEE 计算器Calorie Calculator (TDEE)
根据年龄、身高、体重和活动量计算每日总热量消耗 TDEE，以及减脂/增肌热量建议。Calculate daily calorie needs (TDEE) and targets for weight loss or gain.
体脂率计算器Body Fat Calculator
用美国海军公式通过身高、腰围、颈围（女性加臀围）估算体脂率。Estimate body fat % with the U.S. Navy method (height, waist, neck, hip).
理想体重计算器Ideal Weight Calculator
根据身高和性别，用多种公式（Devine、Robinson、Miller）和健康 BMI 范围计算理想体重。Ideal body weight by height and sex using Devine, Robinson, Miller formulas and healthy BMI range.
每日饮水量计算器Water Intake Calculator
根据体重和运动时间计算每天应该喝多少水。How much water should you drink per day, based on weight and exercise.
预产期计算器Pregnancy Due Date Calculator
根据末次月经日期计算预产期、当前孕周和重要产检时间。Calculate your due date and current pregnancy week from the last menstrual period.
排卵期计算器Ovulation Calculator
根据月经周期计算排卵日、易孕期和未来几个月的预测。Predict ovulation day and fertile window for the next cycles.
心率区间计算器Heart Rate Zone Calculator
用 Karvonen 公式根据年龄和静息心率计算最大心率和 5 个训练心率区间。Calculate max heart rate and 5 training zones (Karvonen method).
腰臀比计算器Waist-to-Hip Ratio Calculator
计算腰臀比（WHR），按 WHO 标准评估健康风险。Calculate waist-to-hip ratio and health risk per WHO guidelines.
睡眠周期计算器Sleep Calculator
按 90 分钟睡眠周期计算最佳入睡或起床时间，醒来不困。Find the best time to sleep or wake up based on 90-minute sleep cycles.
跑步配速计算器Running Pace Calculator
根据距离和用时计算跑步配速（分钟/公里）、速度，并预测 5K、10K、半马、全马成绩。Calculate running pace (min/km), speed and predict 5K/10K/half/marathon times.
蛋白质摄入量计算器Protein Intake Calculator
根据体重和目标（久坐、健身、增肌、减脂）计算每天需要的蛋白质克数。Daily protein needs by body weight and goal (sedentary, fitness, muscle gain, fat loss).
运动消耗热量计算器Calories Burned Calculator
根据运动类型（MET 值）、体重和时长计算运动消耗的卡路里。Estimate calories burned by activity (MET), body weight and duration.
瘦体重计算器Lean Body Mass Calculator
用 Boer、James、Hume 公式估算瘦体重（去脂体重）和体脂比例。Estimate lean body mass with the Boer, James and Hume formulas.
体表面积计算器Body Surface Area (BSA) Calculator
用 Mosteller、DuBois、Haycock 公式计算体表面积（m²），常用于药物剂量计算。Body surface area (m²) by Mosteller, DuBois and Haycock — used for drug dosing.
1RM 最大重量计算器One Rep Max (1RM) Calculator
根据训练重量和次数估算单次最大重量（1RM），并给出各百分比训练重量表。Estimate your one-rep max from weight × reps (Epley, Brzycki, Lombardi) with a percentage table.
三大营养素计算器Macro Calculator
根据每日热量和饮食类型计算蛋白质、碳水化合物、脂肪的克数。Daily protein, carb and fat grams from your calorie target and diet style.
血液酒精浓度计算器Blood Alcohol (BAC) Calculator
用 Widmark 公式估算血液酒精浓度（BAC）和大约多久可以代谢完毕。仅供参考，酒后切勿驾车。Estimate blood alcohol concentration with the Widmark formula and time until sober. Never drink and drive.
步数换算公里计算器Steps to Distance Calculator
根据身高估算步幅，把步数换算为公里/英里，并估算消耗热量。Convert steps to kilometers/miles using a height-based stride length, with estimated calories.
最大摄氧量计算器（Cooper 测试）VO2 Max Calculator (Cooper Test)
根据 12 分钟跑距离（Cooper 测试）估算最大摄氧量 VO2max。Estimate VO2 max from the distance covered in a 12-minute run (Cooper test).
孩子身高预测Child Adult Height Predictor
根据父母身高用遗传身高公式（中位亲代身高法）预测孩子成年身高范围。Predict a child's adult height range from parents' heights (mid-parental method).
血压水平判断Blood Pressure Category Checker
输入收缩压/舒张压，按 AHA 2017 和中国高血压指南判断血压分级。Classify your blood pressure by the AHA 2017 guideline and the Chinese hypertension guideline.
腰高比计算器Waist-to-Height Ratio Calculator
计算腰围身高比（WHtR），评估腹部肥胖风险，0.5 为常用健康界线。Waist-to-height ratio (WHtR) for central obesity risk; 0.5 is the common cut-off.
跑步成绩预测Race Time Predictor
用 Riegel 公式根据已知比赛成绩预测其他距离（5K、10K、半马、全马）的完赛时间。Predict 5K, 10K, half and full marathon times from a known result using Riegel's formula.
吸烟花费计算器（戒烟省钱）Smoking Cost Calculator
计算吸烟每月、每年和多年来的花费，以及戒烟后能省下的钱。How much smoking costs per month, year and over the years — and what quitting saves.
孕期体重增长计算器Pregnancy Weight Gain Calculator
根据孕前 BMI 和 IOM 指南计算孕期建议增重范围及当前孕周的参考增重。Recommended pregnancy weight gain by pre-pregnancy BMI (IOM guidelines), with the target for your week.
FFMI 去脂体重指数FFMI Calculator (Fat-Free Mass Index)
根据身高、体重和体脂率计算去脂体重指数 FFMI 和标准化 FFMI，评估肌肉量。Fat-free mass index (FFMI) and normalized FFMI from height, weight and body fat %.
文胸尺码计算器Bra Size Calculator
由下胸围和上胸围按欧洲标准（EN 13402）计算欧码/中国码，并换算美码和英码（底围 + 罩杯），各品牌版型不同，仅供参考。Work out your EU/China bra size (EN 13402) from underbust and bust, converted to US and UK sizes (band + cup); brands vary, so treat it as a starting point.
美军体脂计算器Army Body Fat Calculator
按美国陆军 2023 年起使用的单部位腹围法（AR 600-9）估算体脂率，并对照年龄组的最大允许体脂标准。Estimate body fat with the US Army one-site (abdomen) tape test used since 2023 (AR 600-9) and compare with the maximum allowed for your age group.
经期计算器Period Calculator
根据上次月经开始日期、周期长度和经期天数，预测接下来几次月经日期、排卵日和易孕期。Predict your next periods, ovulation day and fertile window from the first day of your last period, cycle length and period length.
热量缺口计算器Calorie Deficit Calculator
根据每日总消耗（TDEE）和计划摄入量计算每日热量缺口，估算每周减重速度和达到目标体重所需时间。Daily calorie deficit from your TDEE and planned intake, the weekly weight-loss rate and how long it takes to reach your goal.
减肥计算器Weight Loss Calculator
按 Mifflin-St Jeor 公式估算每日消耗，根据目标体重和期限计算每日应摄入热量，并提示速度是否安全。Estimate daily energy use with Mifflin-St Jeor, then the daily calories needed to hit a goal weight by your deadline, with a safety check.
体型计算器Body Shape Calculator
根据胸围、腰围、上臀围和臀围，按 FFIT 体型分类法判断沙漏型、梨型（三角形）、倒三角形、矩形、勺型等体型。Find your body shape — hourglass, triangle (pear), inverted triangle, rectangle, spoon and more — from bust, waist, high hip and hip measurements using the FFIT method.
受孕日期计算器Conception Date Calculator
根据预产期、末次月经第一天或超声推算的孕周，估算受孕日期和可能的受孕时间窗口，并给出对应的排卵日。Estimate when conception most likely happened from the due date, the first day of the last period or an ultrasound dating, with the likely conception window and ovulation date.
着床日期计算器Implantation Calculator
根据排卵日或末次月经第一天和周期长度，估算受精卵着床的日期范围（排卵后 6–12 天，最常见 8–10 天），以及最早可以验孕和建议验孕的日期。Estimate when implantation may happen — 6 to 12 days after ovulation, most often days 8–10 — from the ovulation date or the first day of the last period and cycle length, with the earliest and recommended pregnancy test dates.
戒酒（戒断）天数计算器Sobriety Calculator
输入戒酒、戒烟或戒除其他习惯的开始日期，计算已坚持的天数、周数、月数和小时数，显示下一个里程碑（30 天、90 天、1 年等），并可估算省下的钱。Count how long you have been sober — or off smoking or another habit — in days, weeks, months and hours from your start date, see the next milestone (30 days, 90 days, 1 year…) and estimate the money saved.
狗粮喂食量计算器Dog Food Calculator
按狗狗体重和生命阶段计算每日能量需求（静息能量 RER = 70 × 体重^0.75，乘以生命阶段系数，主要系数参照 AAHA 2021 指南），再根据狗粮包装上的热量算出每天喂多少克或多少杯。Work out how much to feed your dog: daily calories from resting energy (RER = 70 × weight^0.75) times a life-stage factor (main factors from the 2021 AAHA guidelines), then grams or cups per day from the calorie content on the bag.
狗狗年龄换算（相当于人类几岁）Dog Age Calculator (Dog Years to Human Years)
把狗狗年龄换算成相当于人类的年龄：同时给出按体型的兽医经验法（第 1 年 ≈ 15 岁、第 2 年 ≈ 24 岁，之后小型犬每年约 +4、大型犬约 +6）和 2020 年基于 DNA 甲基化的研究公式 16·ln(狗龄) + 31。Convert your dog's age to human years using the vet rule of thumb by size (year one ≈ 15, year two ≈ 24, then about +4 a year for small dogs up to +7 for giants) and the 2020 DNA-methylation formula 16·ln(age) + 31.
哺乳期热量计算器Breastfeeding Calorie Calculator
按 Mifflin-St Jeor 公式算出基础代谢和日常消耗，再加上哺乳额外需要的热量（美国医学研究院：产后 0–6 个月约 +330 kcal、7–12 个月约 +400 kcal），估算哺乳期妈妈每天该吃多少热量。Estimate daily calories while breastfeeding: Mifflin-St Jeor BMR times activity, plus the extra energy for milk production (US Institute of Medicine: about +330 kcal at 0–6 months and +400 kcal at 7–12 months).
身高百分位计算器（成人参考值或自定义正态分布）Height Percentile Calculator (Adult Reference or Custom Normal Distribution)
输入身高，按所选人群的平均身高和标准差（正态分布近似）求 z 值和百分位，即比多少比例的人高；也可以反过来求某个百分位对应的身高。内置美国成年男女参考值（约 175.3 cm ± 7.6 和 161.3 cm ± 7.1），也可填写其他人群的数据。儿童请使用正式生长曲线。本地处理。Enter a height to get its z-score and percentile (the share of people you are taller than) under a normal approximation for the chosen group, or find the height for a given percentile. Built-in US adult references (about 175.3 cm ± 7.6 for men and 161.3 cm ± 7.1 for women) are included, or enter figures for another population. Use official growth charts for children. Processed locally.
发病率计算器（人时发病率、累积发病率、率比）Incidence Rate Calculator (Person-Time Rate, Cumulative Incidence, Rate Ratio)
流行病学常用指标：按新发病例数和观察人时求发病密度（每 1,000 或 100,000 人年）并给出 95 % 置信区间；按起始风险人群求累积发病率（风险）；或比较两组的发病率比 (IRR) 及其 95 % 置信区间。本地处理。Common epidemiology measures: the incidence rate from new cases and person-time (per 1,000 or 100,000 person-years) with a 95 % confidence interval, cumulative incidence (risk) from the population at risk, or the incidence rate ratio (IRR) of two groups with its 95 % CI. Processed locally.
跳绳卡路里计算器（按速度选 MET）Jump Rope Calorie Calculator (MET by Pace)
按体重、跳绳时间和速度（每分钟跳数）估算消耗的热量：慢速（< 100 次/分）MET 8.8、中速（100–120 次/分）11.8、快速（120–160 次/分）12.3，取自《身体活动纲要》，也可自定义 MET。给出总消耗、净消耗、每分钟消耗、估计跳绳次数和达到目标所需时间。本地处理。Estimate calories burned skipping from weight, time and pace: slow (under 100 skips a minute) MET 8.8, moderate (100–120) 11.8 and fast (120–160) 12.3 from the Compendium of Physical Activities, or a custom MET. You get the total and net burn, the burn per minute, an estimated skip count and the time to reach a target. Processed locally.
维持热量计算器（Mifflin-St Jeor / Harris-Benedict，含减重增重目标）Maintenance Calorie Calculator (Mifflin-St Jeor or Harris-Benedict, with Goals)
按性别、年龄、身高、体重和活动水平估算基础代谢 (BMR) 和每日维持热量 (TDEE)，可选 Mifflin-St Jeor 或修订版 Harris-Benedict 公式，支持公制和英制，并给出每周减重或增重 0.25–0.5 kg 对应的每日热量参考。仅为估算，不是医疗或营养建议。本地处理。Estimate basal metabolic rate (BMR) and daily maintenance calories (TDEE) from sex, age, height, weight and activity level with the Mifflin-St Jeor or revised Harris-Benedict equation, in metric or imperial, plus daily targets for losing or gaining 0.25–0.5 kg a week. An estimate, not medical or nutrition advice. Processed locally.
餐食热量计算器（按项目或宏量营养素加总）Meal Calorie Calculator (Add Up Items or Macros)
每行一项食物：可以只写热量（如“米饭 200”），也可以写“名称, 蛋白质 g, 碳水 g, 脂肪 g”由宏量营养素换算热量（4/4/9 kcal/g）。加总整餐热量和三大营养素，给出供能比例，并与每日目标比较。也兼容用空格分隔的一串热量数字。本地处理。One food per line: either just calories (such as Rice 200) or Name, protein g, carbs g, fat g to work out calories from macros (4/4/9 kcal per gram). The meal total and macros are added up with the energy split and a comparison with your daily target. A plain list of calorie numbers separated by spaces still works. Processed locally.
需治疗人数 NNT 计算器（ARR、RRR、RR、NNH、置信区间）Number Needed to Treat (NNT) Calculator (ARR, RRR, RR, NNH, Confidence Interval)
输入对照组和干预组的事件率（或事件数和总人数），计算绝对风险降低 (ARR)、相对风险降低 (RRR)、相对风险 (RR) 和需治疗人数 NNT（向上取整），干预组事件更多时给出需伤害人数 NNH。按人数输入时附 ARR 和 NNT 的 95 % 置信区间。用于理解研究结果，不能代替临床判断。本地处理。Enter the event rates of the control and treatment groups (or events and group sizes) to get the absolute risk reduction (ARR), relative risk reduction (RRR), relative risk (RR) and the number needed to treat, rounded up, or the number needed to harm when the treatment group fares worse. With counts, 95 % confidence intervals for ARR and NNT are shown. For reading studies, not a substitute for clinical judgement. Processed locally.
吸烟包年计算器（多段吸烟史，肺癌筛查参考）Pack-Year Calculator (Several Smoking Periods, Lung Screening Guide)
按每天吸烟包数（或支数）和吸烟年数计算包年，可以每行输入一段吸烟史后合计。同时说明美国预防服务工作组 (USPSTF) 2021 年肺癌低剂量 CT 筛查建议的年龄和包年条件，供与医生讨论时参考。本地处理。Work out pack-years from packs (or cigarettes) a day and years smoked, with one smoking period per line added together. It also explains the age and pack-year criteria in the 2021 US Preventive Services Task Force (USPSTF) recommendation for low-dose CT lung screening, as a starting point for talking with a doctor. Processed locally.
对乙酰氨基酚剂量参考计算器（儿童按体重，成人上限）Paracetamol (Acetaminophen) Dose Reference Calculator (Child by Weight, Adult Limits)
按体重和 mg/kg 计算对乙酰氨基酚（扑热息痛）单次剂量和对应的混悬液毫升数，并按常见上限检查：单次不超过 1000 mg、24 小时不超过 4 次（每 4–6 小时一次）、每日不超过 60 mg/kg 且不超过 4000 mg。仅为教学参考，用药前请核对说明书或咨询医生、药师。本地处理。From weight and mg/kg, get the single paracetamol (acetaminophen) dose and the matching volume of liquid, checked against common limits: at most 1000 mg a dose, at most 4 doses in 24 hours (every 4–6 hours), and no more than 60 mg/kg and 4000 mg a day. An educational reference only; check the label or ask a doctor or pharmacist before giving any medicine. Processed locally.
儿童剂量换算规则（Clark、Young、Fried、体表面积法）Pediatric Dose Rules (Clark, Young, Fried, Body Surface Area)
用药理学教材中的经典换算规则，由成人剂量估算儿童剂量：Clark 规则（按体重，体重 kg ÷ 68 或 磅 ÷ 150）、Young 规则（按年龄，年龄 ÷ (年龄 + 12)）、Fried 规则（婴儿，月龄 ÷ 150）和体表面积法（BSA ÷ 1.73 m²，Mosteller 公式）。这些规则仅用于学习，现代儿科用药以药品说明书的 mg/kg 剂量为准。本地处理。Estimate a child dose from an adult dose with the classic textbook rules: Clark (by weight, kg / 68 or lb / 150), Young (by age, age / (age + 12)), Fried (infants, months / 150) and the body surface area method (BSA / 1.73 m², Mosteller). These rules are for learning only; modern paediatric dosing follows the mg/kg dose on the product label. Processed locally.
每搏输出量计算器（SV、心指数、搏出指数、射血分数）Stroke Volume Calculator (SV, Cardiac Index, Stroke Volume Index, Ejection Fraction)
三种方法求每搏输出量 SV：心输出量 ÷ 心率；舒张末期容积 − 收缩末期容积（同时得到射血分数 EF）；或超声多普勒法 LVOT 面积 × VTI。输入身高体重可求体表面积和搏出指数、心指数。仅供学习参考。本地处理。Three ways to get stroke volume: cardiac output ÷ heart rate; end-diastolic minus end-systolic volume (which also gives the ejection fraction); or the Doppler method, LVOT area × VTI. Add height and weight for body surface area, stroke volume index and cardiac index. For learning only. Processed locally.
游泳卡路里计算器（按泳姿和强度的 MET）Swimming Calorie Calculator (MET by Stroke and Effort)
按 2024 年体力活动纲要的 MET 值估算游泳消耗：选择泳姿和强度（自由泳慢/中/快、蛙泳、仰泳、蝶泳、踩水、休闲游等），输入体重和时间（kg 或 lb）。kcal = MET × 体重 kg × 小时。也可直接输入自定义 MET。本地处理。Estimates calories burned swimming with MET values from the Compendium of Physical Activities: pick the stroke and effort (freestyle slow, moderate or fast, breaststroke, backstroke, butterfly, treading water, leisure swimming and more) and enter weight in kg or lb and time. kcal = MET × weight in kg × hours. A custom MET can be entered too. Processed locally.
Tinetti 平衡与步态评分（POMA 总分与跌倒风险分级）Tinetti Balance and Gait Score (POMA Total and Fall-Risk Band)
输入 Tinetti 表现导向活动量表（POMA）的平衡分（0–16）和步态分（0–12），得到总分（0–28）和常用的跌倒风险分级：≤18 高风险、19–23 中等风险、≥24 低风险。仅供记录与参考，评估须由专业人员完成。本地处理。Enter the Tinetti Performance-Oriented Mobility Assessment (POMA) balance score (0–16) and gait score (0–12) to get the total (0–28) and the usual fall-risk band: 18 or less high risk, 19–23 moderate risk, 24 or more low risk. For recording and reference only; the assessment itself must be done by a trained professional. Processed locally.
尿量计算器（mL/kg/h、少尿判断）Urine Output Calculator (mL/kg/h and Oliguria Check)
由收集的尿量、体重和收集时长算出每小时每公斤尿量（mL/kg/h）：成人按 KDIGO 急性肾损伤尿量标准对照（<0.5 mL/kg/h），儿童按儿科常用少尿经验阈值对照（<1 mL/kg/h，并非 KDIGO 阈值）；同时给出每小时尿量和 24 小时折算。仅供参考，不能替代医疗判断。本地处理。From the collected urine volume, body weight and collection time, get the urine output in mL/kg/h. For adults it is compared with the KDIGO acute-kidney-injury urine-output criterion (below 0.5 mL/kg/h); for children it is compared with a common pediatric oliguria rule of thumb (below 1 mL/kg/h), which is not the KDIGO threshold. Also shows mL per hour and the 24-hour equivalent. For reference only, not a medical judgement. Processed locally.
步行消耗热量计算器（ACSM 步行公式，速度与坡度）Walking Calorie Calculator (ACSM Walking Equation, Speed and Incline)
用美国运动医学会（ACSM）步行代谢公式 VO₂ = 0.1·速度 + 1.8·速度·坡度 + 3.5（mL/kg/min）估算步行消耗的热量：输入体重、速度、坡度和时长，得到总消耗、净消耗（扣除静息）和每分钟消耗。本地处理。Estimate calories burned walking with the American College of Sports Medicine (ACSM) walking equation VO₂ = 0.1·speed + 1.8·speed·grade + 3.5 (mL/kg/min). Enter weight, speed, incline and duration to get gross calories, net calories (resting subtracted) and calories per minute. Processed locally.
BMI 计算器（身体质量指数，公制/英制，健康体重范围）BMI Calculator (Body Mass Index, Metric/Imperial, Healthy Weight Range)
计算成人 BMI = 体重(kg) ÷ 身高(m)²，支持公制和英制（磅、英尺英寸），按 WHO 分级（也可选亚洲标准），并给出该身高的健康体重范围和 BMI Prime。BMI 不区分肌肉和脂肪，仅供筛查参考。本地处理。Adult BMI = weight (kg) ÷ height (m)², metric or imperial (pounds, feet and inches), classified by WHO (or Asian) cut-offs, with the healthy weight range for your height and BMI Prime. BMI does not tell muscle from fat and is only a screening measure. Processed locally.
女性 BMI 计算器（含腰围、腰高比）BMI Calculator for Women (with Waist and Waist-to-Height Ratio)
女性成人 BMI 和健康体重范围（WHO 标准，与男性相同），可再填腰围：按女性腰围界值（≥80 cm 风险增加、≥88 cm 明显增加）和腰高比（≥0.5 风险增加）评估腹部脂肪风险。孕期不适用。本地处理。Adult BMI and healthy weight range for women (WHO cut-offs, the same as for men), plus an optional waist measurement assessed with the female waist thresholds (80 cm or more increased risk, 88 cm or more substantially increased) and the waist-to-height ratio (0.5 or more increased risk). Not for use in pregnancy. Processed locally.
热量消耗估算器（MET × 体重 × 时间）Calories Burned Estimator (MET × Weight × Time)
粗估消耗 kcal ≈ MET × 体重(kg) × 小时。请先查活动对应的 MET 再填。本地示意，非实验室或穿戴设备测量。Rough kcal ≈ MET × weight(kg) × hours. Look up the activity MET first. Local demo only - not a lab or wearable measurement.
咖啡因摄入Caffeine Intake
总咖啡因 = 份数 × 每份毫克。本地处理。可设置「份数」、「每份 mg」。Total caffeine = servings × mg per serving. Processed locally. Settings: Servings, mg per serving.
输液滴速IV Drops per Minute
滴速 = 体积(mL) × 滴系数 / 时间(min)。本地处理。可设置「体积 mL」、「滴系数 gtt/mL」、「时间 分钟」。Rate = volume (mL) × drop factor / time (min). Processed locally. Settings: Volume mL, Drop factor gtt/mL, Time minutes.
MELD 评分示意MELD Score (demo)
MELD = 3.78 ln(胆红素) + 11.2 ln(INR) + 9.57 ln(肌酐) + 6.43（简化，未计透析修正；按 KDIGO/UNOS 示意：胆红素与 INR 下限 1，肌酐上限 4）。本地处理。MELD = 3.78 ln(bili) + 11.2 ln(INR) + 9.57 ln(creat) + 6.43 (simplified; no dialysis tweak; KDIGO/UNOS-style clamps: bilirubin and INR floored at 1, creatinine capped at 4). Processed locally.
Bradford 因子Bradford Factor
B = S² × D（S 病假次数，D 总病假天数）。本地处理。可设置「病假次数」、「总天数」。B = S² × D (S spells, D total sick days). Processed locally. Settings: Spells, Total days.
皮褶体脂示意Skinfold Body Fat (demo)
简易：体脂% ≈ (Σ三处皮褶)×0.1 + 性别常数（示意，非 Jackson-Pollock）。本地处理。可设置「性别」、「皮褶1 mm」、「皮褶2 mm」、「皮褶3 mm」。Demo: BF% ≈ (sum of 3 skinfolds)×0.1 + sex constant (not Jackson-Pollock). Processed locally. Settings: Sex, Fold 1 mm, Fold 2 mm, Fold 3 mm.
吸烟花费Cigarette Cost
年花费 = 包/天 × 365 × 单价。本地处理。可设置「包/天」、「每包价格」。Yearly cost = packs/day × 365 × price. Processed locally. Settings: Packs / day, Price per pack.
Apgar 评分Apgar Score
五项 0-2 分合计（外观、脉搏、反应、肌张力、呼吸）。本地处理。可设置「外观 0-2」、「脉搏 0-2」、「反应 0-2」、「肌张力 0-2」、「呼吸 0-2」。Sum of five 0-2 scores (appearance, pulse, grimace, activity, respiration). Processed locally. Settings: Appearance 0-2, Pulse 0-2, Grimace 0-2, Activity 0-2, Respiration 0-2.
血糖单位换算Blood Sugar Converter
mmol/L ↔ mg/dL（×18）。本地处理。可设置「方向」、「数值」。mmol/L ↔ mg/dL (×18). Processed locally. Settings: Direction, Value.
儿童 BMI（示意）Child BMI (demo)
BMI = kg / m²（百分位需生长曲线，本页只算 BMI）。本地处理。可设置「体重 kg」、「身高 cm」。BMI = kg / m² (percentiles need growth charts - BMI only here). Processed locally. Settings: Weight kg, Height cm.
钠排泄分数 FENaFENa Calculator (Fractional Excretion of Sodium)
FENa = (尿钠 × 血肌酐) / (血钠 × 尿肌酐) × 100%，常用于区分肾前性与肾性急性肾损伤。仅供学习参考，不能替代医生判断。本地处理。FENa = (urine Na × plasma creatinine) / (plasma Na × urine creatinine) × 100%, used to tell prerenal from intrinsic acute kidney injury. For learning only - not medical advice. Processed locally.
孕周计算（按末次月经）Gestational Age Calculator
按末次月经第一天计算到指定日期的孕周和天数，预产期 = 末次月经 + 280 天（内格莱规则）。仅供参考，以医生和超声为准。本地处理。Gestational age from the first day of the last menstrual period to a chosen date; due date = LMP + 280 days (the Naegele rule). For reference only - your doctor and ultrasound decide. Processed locally.
心率恢复（HRR）Heart Rate Recovery Calculator
运动停止时的心率减去 1 分钟（或 2 分钟）后的心率。1 分钟下降 ≤ 12 次通常被认为偏低。仅供参考。本地处理。Heart rate at the end of exercise minus the rate 1 (or 2) minutes later. A 1-minute drop of 12 bpm or less is usually considered low. For reference only. Processed locally.
试管婴儿（IVF）预产期IVF Due Date Calculator
按胚胎移植日期和胚胎天数计算预产期：第 5 天囊胚 + 261 天，第 3 天胚胎 + 263 天；也可按取卵日 + 266 天。仅供参考。本地处理。Due date from the embryo transfer date and embryo age: day-5 blastocyst + 261 days, day-3 embryo + 263 days; or egg retrieval + 266 days. For reference only. Processed locally.
生酮饮食宏量营养素Keto Macro Calculator
按每日热量和碳水、蛋白质比例计算碳水、蛋白质、脂肪克数（碳水和蛋白质 4 kcal/g，脂肪 9 kcal/g）。仅供参考。本地处理。Grams of carbs, protein and fat from daily calories and carb/protein percentages (carbs and protein 4 kcal/g, fat 9 kcal/g). For reference only. Processed locally.
马拉松配速Marathon Pace Calculator
输入目标完赛时间（时:分:秒），计算每公里、每英里配速和平均速度；可选全马、半马、10K、5K 或自定义距离。本地处理。Enter a target finish time (h:mm:ss) to get the pace per km and per mile and the average speed, for a marathon, half, 10K, 5K or a custom distance. Processed locally.
标准杯酒精量Standard Drink Calculator
纯酒精克数 = 容量 mL × 酒精度 % × 0.789 g/mL；按美国（14 g）、英国（8 g 一单位）、澳大利亚（10 g）和中国常用的 10 g 标准换算杯数。仅供参考。本地处理。Grams of alcohol = volume mL × ABV % × 0.789 g/mL, converted to US (14 g), UK (8 g per unit) and Australian (10 g) standard drinks. For reference only. Processed locally.
6 分钟步行试验6-Minute Walk Test Calculator
Enright 公式估算 6MWT 参考距离。可设置「性别」、「年龄」、「身高 cm」、「体重 kg」、「实测距离 m（可选）」。Reference 6MWT distance (Enright). Settings: Sex, Age, Height cm, Weight kg, Measured m (optional).
步数转英里Steps to Miles Calculator
按身高估算步幅，把步数换成英里/公里。可设置「步数」、「身高 cm」、「性别」。Steps → miles/km using a height-based stride. Settings: Steps, Height cm, Sex.
猫咪年龄换算器（猫龄 → 人类年龄）Cat Age Calculator (Cat Years to Human Years)
按国际猫科医学会（ISFM）和美国猫科医师协会（AAFP）常用的换算：猫 1 岁约等于人 15 岁，2 岁约 24 岁，之后每年约加 4 岁；同时给出所处生命阶段。也可反向由人类年龄换算猫龄。Convert cat years to human years with the common ISFM/AAFP scale — 1 cat year ≈ 15 human years, 2 ≈ 24, then about 4 per year — and see the life stage; or go from human years back to cat years.
狗狗孕期（预产期）计算器Dog Pregnancy Calculator
由配种日期（或排卵日期）估算狗狗的预产期和孕期关键节点：B 超确认、X 光数胎、体温下降监测等。犬的妊娠期从排卵算约 63 天，从第一次配种算为 58–72 天。Estimate a dog's due date and pregnancy milestones — ultrasound, X-ray puppy count, temperature watch — from the breeding (or ovulation) date. Gestation is about 63 days from ovulation, or 58–72 days from the first breeding.
猫咪每日热量计算器Cat Calorie Calculator
按静息能量需求 RER = 70 × 体重(kg)^0.75 和常用的生活阶段系数，估算猫每天需要的热量；输入猫粮热量（kcal/杯或 kcal/罐、kcal/kg）可换算成每日喂食量。Estimate a cat's daily calories from the resting energy requirement RER = 70 × weight(kg)^0.75 and a life-stage factor, and turn it into a daily amount of food from the food's calories per cup, can or kg.
校正血钙计算器（白蛋白校正）Corrected Calcium Calculator
按 Payne 公式用白蛋白校正总血钙：校正钙 = 测得总钙 + 0.8 × (4.0 − 白蛋白)（mg/dL、g/dL），或国际单位 校正钙 = 总钙 + 0.02 × (40 − 白蛋白)（mmol/L、g/L）。Correct total serum calcium for albumin with the Payne formula: corrected Ca = measured Ca + 0.8 × (4.0 − albumin) in mg/dL and g/dL, or Ca + 0.02 × (40 − albumin) in mmol/L and g/L.
中性粒细胞绝对计数（ANC）计算器Absolute Neutrophil Count (ANC) Calculator
由血常规的白细胞总数和中性粒细胞百分比（分叶核 + 杆状核）计算中性粒细胞绝对计数 ANC，并按常用分级判断是否中性粒细胞减少。Calculate the absolute neutrophil count from the white blood cell count and the percentage of neutrophils (segmented + bands), and grade any neutropenia with the usual cut-offs.
尿素氮/肌酐比值（BUN/Cr）计算器BUN to Creatinine Ratio Calculator
由血尿素氮（BUN）和血肌酐计算 BUN/肌酐比值，支持 mg/dL 和国际单位（尿素 mmol/L、肌酐 µmol/L），并给出常见的解读方向。Calculate the blood urea nitrogen (BUN) to creatinine ratio from mg/dL or SI units (urea mmol/L, creatinine µmol/L), with the usual direction of interpretation.
净碳水计算器Net Carbs Calculator
按营养标签计算净碳水：美式标签用 总碳水 − 膳食纤维 − 糖醇（赤藓糖醇、阿洛酮糖全减，其他糖醇常按一半减）；欧盟/英国/中国等标签的「碳水化合物」本身已不含纤维，只需扣糖醇。Work out net carbs from a nutrition label: on US labels, total carbs − fiber − sugar alcohols (erythritol and allulose fully, others usually by half); on EU/UK-style labels "carbohydrate" already excludes fiber, so only sugar alcohols are taken off.
Wilks 系数计算器（力量举）Wilks Calculator
按体重和三项总成绩（深蹲 + 卧推 + 硬拉）计算力量举相对力量分数：原版 Wilks（1994）、Wilks-2（2020）和 DOTS，支持千克和磅。Score powerlifting strength relative to bodyweight from your total (squat + bench + deadlift): original Wilks (1994), Wilks-2 (2020) and DOTS, in kilograms or pounds.
血型遗传计算器（ABO 与 Rh）Blood Type Calculator (ABO and Rh Inheritance)
由父母双方的 ABO 血型和 Rh 血型推算孩子可能和不可能的血型；如果知道父母的基因型（如 AO、BB），还会给出每种血型的概率。Work out which ABO and Rh blood types a child can and cannot have from both parents' types — and, if you know the parents' genotypes (such as AO or BB), the chance of each type.
最大心率计算器（多公式对比）Max Heart Rate Calculator
按年龄用多个常用公式估算最大心率并对比：Fox（220 − 年龄）、Tanaka（208 − 0.7 × 年龄）、Gellish（207 − 0.7 × 年龄）、Nes（211 − 0.64 × 年龄），女性另给出 Gulati（206 − 0.88 × 年龄），并按所选公式列出最大心率百分比区间。Estimate maximum heart rate from age with several common formulas side by side — Fox (220 − age), Tanaka (208 − 0.7 × age), Gellish (207 − 0.7 × age), Nes (211 − 0.64 × age) and, for women, Gulati (206 − 0.88 × age) — with %-of-max zones from the formula you pick.
睡眠周期计算器Sleep Cycle Calculator
按约 90 分钟一个睡眠周期，加上入睡所需时间，算出想在某个时间起床应该几点上床，或现在上床几点起床比较不容易在深睡中被叫醒；周期长度和入睡时间可自定义。Using sleep cycles of about 90 minutes plus the time it takes to fall asleep, find when to go to bed to wake at a set time — or when to wake if you go to bed now — so you are less likely to wake in deep sleep. Cycle length and time to fall asleep are adjustable.
每日碳水化合物计算器Carbohydrate Calculator
按每日热量和碳水供能比例算出每天该吃多少克碳水：默认采用美国医学研究院（IOM）的宏量营养素可接受范围 45–65%，热量可直接填写，或用 Mifflin-St Jeor 公式由身高、体重、年龄和活动量估算。Work out how many grams of carbohydrate to eat a day from your calories and the share from carbs — by default the Institute of Medicine's acceptable range of 45–65% — entering calories directly or estimating them with Mifflin-St Jeor from height, weight, age and activity.
保龄球计分计算器Bowling Score Calculator
输入每一球的结果（X 全中、/ 补中、- 或 0 失球、数字为击倒瓶数；每一球只占一个字符，空格、逗号和竖线都只是分隔符，“9,1”就是 9 瓶和 1 瓶两球），按十瓶制规则逐格计算分数，显示每格得分和累计分；未打完的局给出当前分数和最高可能分。Enter each roll (X for a strike, / for a spare, - or 0 for a miss, digits for pins; each ball is one character, and spaces, commas and bars only separate balls, so '9,1' is two balls, 9 then 1) to score a ten-pin game frame by frame, with each frame's score and the running total — or, for an unfinished game, the score so far and the highest possible final score.
棒球打击率计算器Batting Average Calculator
打击率 AVG = 安打 ÷ 打数，按棒球惯例显示为 .300 这样的三位小数；还可以算出要达到目标打击率还需要连续击出几支安打。Batting average AVG = hits ÷ at-bats, shown baseball-style to three decimals like .300 — plus how many straight hits you need to reach a target average.
上垒率（OBP）计算器On-Base Percentage Calculator
上垒率 OBP = (安打 + 保送 + 触身球) ÷ (打数 + 保送 + 触身球 + 牺牲飞球)；填写长打数据还可同时算出长打率和 OPS。On-base percentage OBP = (hits + walks + hit-by-pitch) ÷ (at-bats + walks + hit-by-pitch + sacrifice flies); add extra-base hits to get slugging and OPS too.
长打率（SLG）计算器Slugging Percentage Calculator
长打率 SLG = 垒打数 ÷ 打数，垒打数 = 一垒安打 + 2 × 二垒安打 + 3 × 三垒安打 + 4 × 本垒打；同时给出打击率和纯长打率（ISO）。Slugging percentage SLG = total bases ÷ at-bats, with total bases = singles + 2 × doubles + 3 × triples + 4 × home runs — plus batting average and isolated power (ISO).
四分之一英里（直线加速）成绩估算器Quarter Mile Calculator
按常被引用的 Huntington 经验公式，由车重和马力估算 1/4 英里直线加速时间（ET）和终点速度：ET = 5.825 × (重量 ÷ 马力)^(1/3)，终速 = 234 × (马力 ÷ 重量)^(1/3)；也可由 ET 或终速反推马力。Estimate quarter-mile elapsed time and trap speed from weight and horsepower with the often-quoted Huntington rules of thumb, ET = 5.825 × (weight ÷ hp)^(1/3) and trap mph = 234 × (hp ÷ weight)^(1/3) — or back out horsepower from an ET or trap speed.
eDPI 与鼠标灵敏度换算计算器eDPI Calculator
计算游戏中的有效灵敏度 eDPI = 鼠标 DPI × 游戏内灵敏度，并按游戏的转角系数换算成转一圈（360°）需要移动的厘米/英寸数；还能把灵敏度从一个游戏换算到另一个游戏。Work out eDPI = mouse DPI × in-game sensitivity, convert it to centimetres or inches per 360° turn using each game's yaw, and carry your sensitivity from one game to another.
猫龄换算人类年龄Convert Cat Age to Human Years
按常用阶段公式把猫龄换成人类年龄（第1年=15，第2年+9，之后每年+4）。本地处理。Convert cat age to human years (year 1 = 15, year 2 +9, then +4 per year). Processed locally.
人类年龄换算猫龄Convert Human Age to Cat Years
按常用阶段公式把人类年龄反换算成猫龄。本地处理。Convert human age back to cat years with the usual stage formula. Processed locally.
人类年龄换算狗龄Convert Human Age to Dog Years
按体型阶段公式把人类年龄换成狗龄（默认中型）。本地处理。可设置「体型」。Convert human age to dog years by size stage (medium by default). Processed locally. Settings: Size.
跑步卡路里计算器Running Calorie Calculator
按 2024 年《成人身体活动纲要》跑步 MET 值（按速度插值）、体重和时长估算跑步消耗的热量，支持 kg/lb、km/英里、配速/速度/用时。本地处理。Estimate calories burned running from the 2024 Adult Compendium of Physical Activities running METs (interpolated by speed), body weight and duration; kg/lb, km/miles, pace, speed or time. Processed locally.
胎儿体重估算Fetal Weight Estimator
按宫高与腹围用产科教材常用的经验公式（宫高 × 腹围 + 200 g）估算胎儿体重，仅作参考，不能替代超声与医生评估。本地处理。Estimates fetal weight from fundal height and abdominal girth with the rule of thumb used in Chinese obstetrics textbooks (fundal height × abdominal girth + 200 g). For reference only; it does not replace ultrasound or a clinician. Processed locally.
按体重计算剂量（mg/kg，含浓度换算毫升）Weight-Based Dosage Calculator (mg/kg, with mL from concentration)
按体重计算药物剂量：体重（kg 或 lb，0.1–700 kg）× 每公斤剂量（mg/kg），可选单次最大剂量上限、每日次数，以及按药液浓度（mg/mL）换算成毫升。仅用于核对计算，不能替代医嘱。本地处理。Weight-based drug dose: weight (kg or lb, 0.1–700 kg) × dose per kg (mg/kg), with an optional maximum single dose, doses per day and conversion to millilitres from the concentration (mg/mL). For checking arithmetic only, not a prescription. Processed locally.
褪黑素剂量参考（按年龄组）Melatonin Dose Reference by Age Group
把拟用的褪黑素剂量与所选年龄组的公开参考上限比较（儿童按 IPSA 2025 专家共识与 AAP HealthyChildren，成人按 NHS 与 NCCIH），超出时给出警示并列出注意事项。仅供参考，不能替代医生或药师建议。本地处理。Compare an intended melatonin dose with published reference limits for an age group (children: IPSA 2025 expert consensus and AAP HealthyChildren; adults: NHS and NCCIH), with warnings above the range and safety cautions. Reference only, not medical advice. Processed locally.
卡铂剂量计算器（Calvert 公式）Carboplatin Dose Calculator (Calvert)
按 Calvert 公式 剂量 = AUC × (GFR + 25) 计算卡铂剂量；估算 GFR 超过 125 mL/min 时自动封顶，可用 Cockcroft–Gault 由年龄、体重、性别和肌酐估算。仅供学习核对，不可用于处方。本地处理。Carboplatin dose by the Calvert formula, dose = AUC × (GFR + 25); an estimated GFR above 125 mL/min is capped, and GFR can be estimated with Cockcroft–Gault from age, weight, sex and creatinine. For learning and double-checking only, not for prescribing. Processed locally.
胆固醇比值计算器（TC/HDL、LDL/HDL、TG/HDL、非 HDL）Cholesterol Ratio Calculator (TC/HDL, LDL/HDL, TG/HDL, non-HDL)
由血脂化验结果计算总胆固醇 / HDL、LDL / HDL、甘油三酯 / HDL 和非 HDL 胆固醇，支持 mg/dL 与 mmol/L（胆固醇 ×38.67，甘油三酯 ×88.57），并按 NCEP ATP III 与美国国家脂质协会（NLA）的分级给出参考区间。仅供参考，不能替代医生判断。本地处理。Total cholesterol / HDL, LDL / HDL, triglyceride / HDL and non-HDL cholesterol from a lipid panel, in mg/dL or mmol/L (cholesterol ×38.67, triglycerides ×88.57), with reference bands from NCEP ATP III and the National Lipid Association (NLA). For information only, not a diagnosis. Processed locally.
骑行消耗卡路里计算器（2024 体力活动纲要）Calories Burned Biking Calculator (2024 Compendium)
按 2024 年《成人体力活动纲要》（Compendium of Physical Activities）的骑行 MET 值估算消耗：千卡 = MET × 体重（kg）× 时长（小时）。公路骑行按平均速度（km/h 或 mph）选取 MET，也可选山地车或室内单车。本地处理。Estimate calories burned cycling with the MET values of the 2024 Adult Compendium of Physical Activities: kcal = MET × body weight (kg) × duration (hours). Road cycling picks the MET from your average speed (km/h or mph); mountain biking and indoor cycling are also available. Processed locally.
减重百分比计算器（目标进度与每周速度）Weight Loss Percentage Calculator (Goal Progress & Weekly Rate)
由起始体重和当前体重算减重量和减重百分比（体重增加时显示增重）；可选目标体重看完成进度，可选经过周数看平均每周减重和每周百分比。任何体重单位都可以。本地处理。Weight lost and the percentage lost from your starting and current weight (a gain is shown as a gain), with optional goal progress and, given the number of weeks, the average loss per week and percent per week. Any weight unit works. Processed locally.
美国海军体脂计算器（男女，cm/英寸）US Navy Body Fat Calculator (Men & Women, cm or in)
用美国海军围度法估算体脂率：男性用身高、颈围、腰围，女性另加臀围。可用厘米或英寸，填写体重时还会给出脂肪量和去脂体重，并按 ACE 分级说明所在区间。仅为估算，不能代替医学检查。本地处理。Estimate body fat with the US Navy circumference method: height, neck and waist for men, plus hips for women. Use centimetres or inches; add your weight to also get fat mass and lean mass, and see which ACE category the result falls in. This is an estimate, not a medical test. Processed locally.
Bishop 宫颈评分计算器（教学用）Bishop Score Calculator (Educational)
按经典 Bishop 评分的五项（宫口扩张、宫颈消退、先露位置、宫颈硬度、宫颈位置）选择检查结果，得到 0–13 分的总分和各项得分，并说明常用的判读阈值。仅供学习，不能用于临床决策。本地处理。Pick the findings for the five items of the classic Bishop score (dilation, effacement, station, consistency, position) to get the 0–13 total, the points for each item and the usual reading of the score. For learning only, not for clinical decisions. Processed locally.
阿莫西林儿童剂量参考计算器（mg/kg）Amoxicillin Pediatric Dose Reference Calculator (mg/kg)
按体重和所选的 mg/kg/日 方案算出每日总量、每次剂量和对应的口服混悬液毫升数，并按成人常用上限封顶。方案取自说明书常见用法和高剂量方案。仅为教学参考，具体剂量必须遵医嘱和药品说明书。本地处理。From the weight and a chosen mg/kg/day regimen, get the daily total, the dose per administration and the matching volume of oral suspension, capped at the usual adult maximum. Regimens follow common label and high-dose schedules. Educational reference only; the actual dose must come from a clinician and the product label. Processed locally.
AST/ALT 比值计算器（De Ritis 比值）AST/ALT Ratio Calculator (De Ritis Ratio)
输入同一次化验的 AST 和 ALT（U/L），计算 AST/ALT（De Ritis）比值，并对照常见参考上限标出是否升高，附上文献中常见的解读方式。仅供了解，结果需由医生结合病史解读。本地处理。Enter AST and ALT (U/L) from the same blood test to get the AST/ALT (De Ritis) ratio, see whether each is above a common upper reference limit, and read how the ratio is usually discussed in the literature. For information only; a clinician must interpret results with your history. Processed locally.
药物半衰期计算器（剩余量、清除时间、重复给药稳态）Drug Half-Life Calculator (Amount Left, Clearance Time, Repeated-Dose Steady State)
按一级动力学（指数衰减）计算：经过一段时间后体内剩余多少；降到某个量或百分比需要多久；以及按固定间隔重复给药时的蓄积倍数和稳态峰谷量。附逐个半衰期的剩余比例表。仅为药理学教学模型，不能用于决定用药。本地处理。Using first-order (exponential) elimination: how much remains after a time, how long until the amount falls to a level or percentage, and the accumulation factor and steady-state peak and trough with repeated doses at a fixed interval, with a table of what remains after each half-life. A teaching model of pharmacology, not for dosing decisions. Processed locally.
椭圆机卡路里计算器（MET 法，含净消耗）Elliptical Calorie Calculator (MET Method, with Net Burn)
按体重、锻炼时间和强度（MET 值）估算椭圆机消耗的热量：总消耗 kcal = MET × 体重 kg × 小时，同时给出扣除静息代谢后的净消耗、每分钟消耗，以及达到目标热量需要的时间。支持 kg 和 lb。本地处理。Estimate the calories burned on an elliptical trainer from weight, time and intensity (MET): total kcal = MET × weight in kg × hours, with the net burn above resting, the burn per minute and the time needed to reach a target. Works in kg or lb. Processed locally.