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🍳 菜谱用量换算器（按份数缩放）Recipe Scaler
把菜谱按新的份数或倍数等比例放大或缩小：粘贴配料清单（每行一种，如“2 1/2 杯 面粉”“200g butter”），自动换算每种配料的用量，支持分数、带分数、小数和范围（如 2–3）。Scale a recipe up or down to a new number of servings or by any factor: paste the ingredient list, one per line (such as "2 1/2 cups flour" or "200 g butter"), and every amount is recalculated — fractions, mixed numbers, decimals and ranges like 2–3 included.
使用说明与常见问题How-to & FAQ
「菜谱用量换算器（按份数缩放）」是什么？What is the Recipe Scaler tool?
把菜谱按新的份数或倍数等比例放大或缩小：粘贴配料清单（每行一种，如“2 1/2 杯 面粉”“200g butter”），自动换算每种配料的用量，支持分数、带分数、小数和范围（如 2–3）。Scale a recipe up or down to a new number of servings or by any factor: paste the ingredient list, one per line (such as "2 1/2 cups flour" or "200 g butter"), and every amount is recalculated — fractions, mixed numbers, decimals and ranges like 2–3 included.
如何使用「菜谱用量换算器（按份数缩放）」？How do I use the Recipe Scaler tool?
在「菜谱用量换算器（按份数缩放）」中，填写「缩放方式」、「原份数」、「新份数」、「倍数」等参数，结果会随输入实时计算并显示在下方。In the Recipe Scaler: Fill in "Scale by", "Original servings", "New servings", "Factor"; results are recalculated instantly as you type.
支持哪些数量写法？Which amount formats work?
行首的整数、小数、分数（3/4）、带分数（2 1/4）、Unicode 分数（½、¾）以及范围（2–3、2-3、2 to 3）都可以识别。没有数量的行（如“盐少许”）保持不变。千位分隔符（1,000）可以识别；含义不明确或无法识别的写法（如 1,5、1.2.3、3/、1/0、1e6）也会保持不变，并在表中提示。Whole numbers, decimals, fractions (3/4), mixed numbers (2 1/4), Unicode fractions (½, ¾) and ranges (2–3, 2-3, 2 to 3) at the start of a line. Lines without an amount, like "salt to taste", stay as they are. Thousands separators (1,000) work; ambiguous or unreadable amounts (such as 1,5, 1.2.3, 3/, 1/0 or 1e6) are left unchanged and flagged in the table.
为什么显示成分数？Why fractions?
量杯、量勺常用 1/4、1/3、1/2 等刻度，所以默认把结果近似到最接近的 1/8、1/4、1/3；误差超过 0.03 时改用小数（这是本工具的显示规则）。用 g、kg、mg、ml、L 或 克、千克、毫升 等称量的配料总是显示为小数。Measuring cups and spoons use 1/4, 1/3, 1/2 and so on, so results round to the nearest eighth, quarter or third, falling back to decimals when that would be off by more than 0.03 (this tool's display rule). Ingredients in g, kg, mg, ml or L are always shown as decimals.
鸡蛋等整数配料怎么办？What about eggs?
工具按比例换算，可能得到 1 1/2 个鸡蛋之类的结果，可以打散后按体积取用，或四舍五入。烘焙时发酵粉、盐等的放大比例也建议适当保守。The tool scales proportionally, so you may get 1 1/2 eggs — beat them and measure by volume, or round. In baking, scale leaveners and salt a little conservatively.
「菜谱用量换算器（按份数缩放）」免费吗？需要注册吗？Is the Recipe Scaler free? Do I need an account?
「菜谱用量换算器（按份数缩放）」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 Recipe Scaler is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.