👗 圆裙裁剪计算器（整圆、半圆、四分之一圆）Circle Skirt Calculator (Full, Half & Quarter Circle)
按腰围、裙长和缝份算圆裙的腰线半径和外半径，支持整圆、半圆和四分之一圆裙，并给出需要的布料尺寸，提示布幅够不够。支持厘米和英寸。本地处理。Work out the waist radius and outer radius of a full, half or quarter circle skirt from the waist, skirt length and allowances, with the fabric size needed and a check against the fabric width. In cm or inches. Processed locally.
使用说明与常见问题How-to & FAQ
「圆裙裁剪计算器（整圆、半圆、四分之一圆）」是什么？What is the Circle Skirt Calculator (Full, Half & Quarter Circle) tool?
按腰围、裙长和缝份算圆裙的腰线半径和外半径，支持整圆、半圆和四分之一圆裙，并给出需要的布料尺寸，提示布幅够不够。支持厘米和英寸。本地处理。Work out the waist radius and outer radius of a full, half or quarter circle skirt from the waist, skirt length and allowances, with the fabric size needed and a check against the fabric width. In cm or inches. Processed locally.
如何使用「圆裙裁剪计算器（整圆、半圆、四分之一圆）」？How do I use the Circle Skirt Calculator (Full, Half & Quarter Circle) tool?
在「圆裙裁剪计算器（整圆、半圆、四分之一圆）」中，填写「样式」、「单位」、「腰围」、「裙长（成品）」、「下摆折边」等参数，结果会随输入实时计算并显示在下方。In the Circle Skirt Calculator (Full, Half & Quarter Circle): Fill in "Style", "Unit", "Waist", "Finished skirt length", "Hem allowance"; results are recalculated instantly as you type.
腰线半径怎么算？How is the waist radius found?
腰线是圆的一部分，所以半径 = 腰围 ÷（2π × 比例）：整圆比例 1，半圆 0.5，四分之一圆 0.25。例如腰围 70 cm 的整圆裙，半径约 11.14 cm。The waistline is part of a circle, so radius = waist ÷ (2π × fraction): 1 for a full circle, 0.5 for a half and 0.25 for a quarter. A 70 cm waist on a full circle skirt gives a radius of about 11.14 cm.
要加多少缝份？How much allowance should I add?
下摆常加 1–3 cm（窄卷边更少），腰部缝份常见 1–1.5 cm。腰部缝份从腰线半径里减去，这样缝好后腰围正好。斜裁的弹性布料可以把腰围稍微减一点。Hems are usually 1–3 cm (less for a narrow rolled hem) and waist seams 1–1.5 cm. The waist seam allowance is taken off the waist radius so the finished waist is right. On bias-cut or stretchy fabric you can reduce the waist slightly.
布幅不够怎么办？What if the fabric is not wide enough?
整圆裙一片需要 2 × 外半径 见方的布。不够宽时分成两个半圆或四个四分之一圆，侧边加缝份后拼接。A one-piece full circle needs a square 2 × the outer radius on each side. If the fabric is narrower, cut two half circles or four quarters and join them, adding side seam allowances.
能举个计算实例吗？Can you show a worked example?
例如在「圆裙裁剪计算器（整圆、半圆、四分之一圆）」中填 样式 = 整圆，单位 = 厘米，腰围 = 62.83，裙长（成品） = 50，下摆折边 = 0，腰部缝份 = 0，结果区显示：腰线半径（成品）：10 cm；裁剪腰线半径（减缝份）：10 cm；外半径（含折边）：60 cm；所需布料（单片）：120 × 120 cm；下摆周长：377 cm；ℹ 腰线半径 = 腰围 ÷（2π × 圆的比例）；外半径 = 腰线半径 + 裙长 + 折边For example, entering Style = Full circle, Unit = cm, Waist = 62.83, Finished skirt length = 50, Hem allowance = 0, Waist seam allowance = 0 in the Circle Skirt Calculator (Full, Half & Quarter Circle) gives: Waist radius (finished): 10 cm; Cutting waist radius (minus seam allowance): 10 cm; Outer radius (with hem): 60 cm; Fabric needed (one piece): 120 × 120 cm; Hem circumference: 377 cm; ℹ waist radius = waist ÷ (2π × fraction of a circle); outer radius = waist…
哪些输入会被检查？Which inputs are validated?
「圆裙裁剪计算器（整圆、半圆、四分之一圆）」会检查这些输入——「腰围」、「裙长（成品）」：必须填写，须大于 0；「下摆折边」：可留空；「腰部缝份」：不能为负数；「布幅宽度（可选）」：须大于 0；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Circle Skirt Calculator (Full, Half & Quarter Circle) checks its inputs — "Waist", "Finished skirt length": required, must be greater than 0; "Hem allowance": optional; "Waist seam allowance": cannot be negative; "Fabric width (optional)": must be greater than 0; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.
有哪些选项可以调整？What options can I adjust?
「圆裙裁剪计算器（整圆、半圆、四分之一圆）」的设置：「样式」可选 整圆、半圆、四分之一圆（默认 整圆）；「单位」可选 厘米、英寸（默认 厘米）；「腰围」默认 70；「裙长（成品）」默认 60；「下摆折边」默认 2；「腰部缝份」默认 1；「布幅宽度（可选）」默认 150。每次生成结果都按当前设置处理。Settings in the Circle Skirt Calculator (Full, Half & Quarter Circle) — "Style": Full circle, Half circle, Quarter circle (default Full circle); "Unit": cm, inches (default cm); "Waist" default 70; "Finished skirt length" default 60; "Hem allowance" default 2; "Waist seam allowance" default 1; "Fabric width (optional)" default 150. The result always uses the current settings.
手机上能用吗？Does it work on mobile?
可以。「圆裙裁剪计算器（整圆、半圆、四分之一圆）」支持触屏操作，在手机和平板浏览器中均可使用，无需安装 App。Yes. The Circle Skirt Calculator (Full, Half & Quarter Circle) supports touch input and works in mobile and tablet browsers without installing an app.
「圆裙裁剪计算器（整圆、半圆、四分之一圆）」免费吗？需要注册吗？Is the Circle Skirt Calculator (Full, Half & Quarter Circle) free? Do I need an account?
「圆裙裁剪计算器（整圆、半圆、四分之一圆）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Circle Skirt Calculator (Full, Half & Quarter Circle) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.