📏 单位换算Unit Converters （第 30 页）(page 30)
光纳秒 ↔ 罗马肘Light-nanosecond to Roman cubit
光纳秒与罗马肘互算（1 light-ns = 0.6752082387 cubit Rom）。本地换算，附常用相关单位。Convert light-nanosecond and Roman cubit (1 light-ns = 0.6752082387 cubit Rom). Runs locally with related units.
光纳秒 ↔ 埃及短肘Light-nanosecond to Egyptian short cubit
光纳秒与埃及短肘互算（1 light-ns = 0.6662054622 cubit EgS）。本地换算，附常用相关单位。Convert light-nanosecond and Egyptian short cubit (1 light-ns = 0.6662054622 cubit EgS). Runs locally with related units.
光纳秒 ↔ 公制海缆Light-nanosecond to Metric cable
光纳秒与公制海缆互算（1 light-ns = 0.001618749773 cable met）。本地换算，附常用相关单位。Convert light-nanosecond and metric cable (1 light-ns = 0.001618749773 cable met). Runs locally with related units.
光纳秒 ↔ 美制工程师链Light-nanosecond to US engineer chain
光纳秒与美制工程师链互算（1 light-ns = 0.009835710564 ch EngUS）。本地换算，附常用相关单位。Convert light-nanosecond and US engineer chain (1 light-ns = 0.009835710564 ch EngUS). Runs locally with related units.
周与年换算Weeks to Years Converter
把周数换算成年（公历平均年 = 52.1775 周），同时给出按 52 周一年、按月和按天的换算；也可以把年换回周。Convert weeks to years (an average Gregorian year is 52.1775 weeks), along with 52-week years, months and days — or convert years back to weeks.
Mbps 与 Gbps 换算Mbps to Gbps Converter
在 Mbps（兆比特每秒）和 Gbps（吉比特每秒）之间换算（1 Gbps = 1,000 Mbps），同时给出 Kbps、MB/s、GB/s，并可估算按该速率传输一个文件需要多久。Convert between Mbps (megabits per second) and Gbps (gigabits per second) — 1 Gbps = 1,000 Mbps — with Kbps, MB/s and GB/s, and an estimate of how long a file takes at that speed.
酵母换算计算器Yeast Conversion Calculator
在干酵母（活性干酵母）、即发干酵母和鲜酵母之间换算用量，支持克、盎司、茶匙、标准包（7 克）和 2 盎司鲜酵母块；按 Red Star 酵母的换算：干酵母与即发酵母 1:1，鲜酵母约为干酵母的 2.7 倍重。Convert amounts between active dry, instant and fresh (cake) yeast in grams, ounces, teaspoons, standard 7 g packets or 2 oz fresh cakes — using Red Star Yeast's figures: active dry and instant swap 1:1, and fresh yeast is about 2.7 times the weight of dry.
文件大小换算File Size Converter
在 B、KB/MB/GB/TB（1000 进制）与 KiB/MiB/GiB/TiB（1024 进制）之间精确换算。本地处理。Convert exactly between B, KB/MB/GB/TB (powers of 1000) and KiB/MiB/GiB/TiB (powers of 1024). Processed locally.
周转小时（及天、分钟）Weeks to Hours (and days, minutes)
在周、天、小时、分钟、秒之间换算（一周 = 7 天 = 168 小时），可输入小数，也可选“工作周”按每周工时计算。本地处理。Convert between weeks, days, hours, minutes and seconds (1 week = 7 days = 168 hours); decimals are fine, and a work-week option uses your weekly working hours. Processed locally.
用沙量计算器（体积、重量、袋数）Sand Calculator (Volume, Weight, Bags)
按矩形或圆形面积与铺设厚度计算用沙体积（m³、yd³、ft³）和重量（kg、lb、公吨、美吨），并按袋装规格算出需要多少袋。支持公制和英制，可选干沙、湿沙或自定义密度。本地处理。Sand volume (m³, yd³, ft³) and weight (kg, lb, metric tonnes, US short tons) for a rectangular or circular area at a given depth, plus the number of bags for a chosen bag size. Metric or imperial units, with dry, wet or custom density. Processed locally.
量纲分析单位换算（因子链）Dimensional Analysis Unit Converter (factor-label)
用量纲分析（因子标签法）换算单位：支持长度、质量、时间、体积、能量、力、功率、压强及 km/h → m/s、kg·m/s² 这类复合单位，逐步列出换算因子链，单位量纲不一致时报错。本地处理。Convert units by dimensional analysis (the factor-label method): length, mass, time, volume, energy, force, power, pressure and compound units such as km/h → m/s or kg·m/s², with every conversion factor in the chain shown and an error when the dimensions do not match. Processed locally.
河卵石用量计算器（体积、重量、袋数）River Rock Calculator (Volume, Weight, Bags)
按铺设区域的长、宽（或直接面积）和厚度算需要多少河卵石：体积、重量和袋数，含损耗余量，支持公制和英制。默认密度 1,600 kg/m³（约 1.35 短吨/立方码）。本地处理。Work out how much river rock you need from the length and width (or the area) and the depth: volume, weight and number of bags, with a waste allowance, in metric or US units. Default density 1,600 kg/m³ (about 1.35 short tons per cubic yard). Processed locally.
力矩（扭矩）单位换算Moment of Force (Torque) Converter
在 N·m、kN·m、N·cm、N·mm、kgf·m、kgf·cm、gf·cm、lbf·ft（ft·lb）、lbf·in（in·lb）、ozf·in 和 dyn·cm 之间换算力矩/扭矩，一次列出全部结果。本地处理。Convert moment of force (torque) between N·m, kN·m, N·cm, N·mm, kgf·m, kgf·cm, gf·cm, lbf·ft (ft·lb), lbf·in (in·lb), ozf·in and dyn·cm, with every result listed at once. Processed locally.
接线盒容积计算器（NEC）/ 装箱数量计算器Box Fill Calculator (NEC Electrical) & Packing Box Count
两种用法：按美国电气规范 NEC 314.16 计算接线盒需要的容积（导线、接地线、器件、线夹、管接头折算导线数 × 每根导线容积），并和盒子容积比较；或者计算长方体箱子能装多少件同样大小的物品，自动尝试 6 种摆放方向。本地处理。Two uses: work out the volume an electrical box needs under NEC 314.16 (conductors, grounds, devices, clamps and fittings counted as conductor allowances × volume per conductor) and compare it with the box, or count how many identical items fit in a carton, trying all 6 orientations. Processed locally.