🧵 布料用量计算器（按裁片排版或面积，米/码）Fabric Calculator (by Pattern Pieces or Area, Metres or Yards)

使用说明与常见问题How-to & FAQ

「布料用量计算器（按裁片排版或面积，米/码）」是什么？What is the Fabric Calculator (by Pattern Pieces or Area, Metres or Yards) tool?

两种算法：按裁片尺寸和数量，在给定幅宽上逐行排版（可选是否允许旋转、对花余量），算出需要的布长；或按所需面积除以幅宽估算。结果加上损耗，并换算成米、厘米和码。本地处理。Two ways: lay out pattern pieces of a given size and count across the fabric width row by row (optionally allowing rotation and adding a pattern-repeat allowance) to get the length needed, or estimate from the area divided by the width. Waste is added and the result is shown in metres, centimetres and yards. Processed locally.

如何使用「布料用量计算器（按裁片排版或面积，米/码）」？How do I use the Fabric Calculator (by Pattern Pieces or Area, Metres or Yards) tool?

在「布料用量计算器（按裁片排版或面积，米/码）」中，填写「算法」、「单位」、「幅宽」、「裁片宽」、「裁片长」等参数，结果会随输入实时计算并显示在下方。In the Fabric Calculator (by Pattern Pieces or Area, Metres or Yards): Fill in "Method", "Units", "Fabric width", "Piece width", "Piece length"; results are recalculated instantly as you type.

排版怎么算？How is the layout worked out?

每行能放的裁片数 = 幅宽 ÷ 裁片宽（向下取整），行数 = 裁片总数 ÷ 每行数量（向上取整），布长 = 行数 × 裁片长。允许旋转时会比较两种方向，取用布更少的方案。Pieces per row = fabric width / piece width rounded down; rows = pieces / per row rounded up; length = rows × piece length. With rotation allowed both orientations are tried and the shorter one is used.

常见幅宽有哪些？What are common fabric widths?

常见有 110–115 cm（44–45 英寸）、140–150 cm（54–60 英寸），床品布可达 2.5–2.8 m。请以布料标签为准。Common widths are 110–115 cm (44–45 in) and 140–150 cm (54–60 in); sheeting can be 2.5–2.8 m. Check the bolt label.

有花型的布要多买多少？How much extra for patterned fabric?

需要对花时，通常每个裁片要多留一个花回长度，可在“对花余量”里填写总长度。有方向的图案（绒布、单向花）不要允许旋转。Matching a pattern usually needs one repeat extra per piece; enter the total in the repeat allowance. Do not allow rotation for directional prints or napped fabric.

能举个计算实例吗？Can you show a worked example?

例如在「布料用量计算器（按裁片排版或面积，米/码）」中填 算法 = 按面积，单位 = 厘米，幅宽 = 140，所需面积（m² 或 sq ft） = 5.6，对花余量（长度） = 0，损耗 % = 0，结果区显示：需要布长：400 cm；4 m / 4.37 yd；建议购买：4 m；ℹ 含 0 % 损耗。缩水的布料请先预洗或再加约 5–10 %。For example, entering Method = By area, Units = cm, Fabric width = 140, Area needed (m² or sq ft) = 5.6, Pattern repeat allowance (length) = 0, Waste % = 0 in the Fabric Calculator (by Pattern Pieces or Area, Metres or Yards) gives: Length needed: 400 cm; 4 m / 4.37 yd; Suggested purchase: 4 m; ℹ Includes 0 % waste. Pre-wash fabric that shrinks or add about 5–10 % more.

哪些输入会被检查？Which inputs are validated?

「布料用量计算器（按裁片排版或面积，米/码）」会检查这些输入——「幅宽」：必须填写，须大于 0；「裁片宽」、「裁片长」、「所需面积（m² 或 sq ft）」：所选方式用到时必须填写，须大于 0；「裁片数量」：所选方式用到时必须填写，须为不小于 1 的整数；「对花余量（长度）」：不能为负数；「损耗 %」：可留空；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 Fabric Calculator (by Pattern Pieces or Area, Metres or Yards) checks its inputs — "Fabric width": required, must be greater than 0; "Piece width", "Piece length", "Area needed (m² or sq ft)": required when the chosen option uses it, must be greater than 0; "Number of pieces": required when the chosen option uses it, must be a whole number of at least 1; "Pattern repeat allowance (length)": cannot be negative; "Waste %": optional; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the…

有哪些选项可以调整？What options can I adjust?

「布料用量计算器（按裁片排版或面积，米/码）」的设置：「算法」可选 按裁片排版、按面积（默认 按裁片排版）；「单位」可选 厘米、英寸（默认 厘米）；「幅宽」默认 140；「裁片宽」默认 50；「裁片长」默认 70；「裁片数量」默认 4；「允许旋转 90°」可选 允许、不允许（有方向的布）（默认 允许）；「所需面积（m² 或 sq ft）」默认 5；「对花余量（长度）」默认 0；「损耗 %」默认 10。每次生成结果都按当前设置处理。Settings in the Fabric Calculator (by Pattern Pieces or Area, Metres or Yards) — "Method": Lay out pieces, By area (default Lay out pieces); "Units": cm, in (default cm); "Fabric width" default 140; "Piece width" default 50; "Piece length" default 70; "Number of pieces" default 4; "Allow 90° rotation": Yes, No (directional fabric) (default Yes); "Area needed (m² or sq ft)" default 5; "Pattern repeat allowance (length)" default 0; "Waste %" default 10. The result always uses the current settings.

手机上能用吗？Does it work on mobile?

可以。「布料用量计算器（按裁片排版或面积，米/码）」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 Fabric Calculator (by Pattern Pieces or Area, Metres or Yards) supports touch input and works in mobile and tablet browsers without installing an app.

「布料用量计算器（按裁片排版或面积，米/码）」免费吗？需要注册吗？Is the Fabric Calculator (by Pattern Pieces or Area, Metres or Yards) free? Do I need an account?

「布料用量计算器（按裁片排版或面积，米/码）」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 Fabric Calculator (by Pattern Pieces or Area, Metres or Yards) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.