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🧱 保温层厚度与用量计算器Insulation Calculator
按目标 R 值、现有 R 值和保温材料的每英寸 R 值，计算还需要多厚的保温层、总体积，以及按包装覆盖面积需要几包；材料 R 值取自美国能源部和 PNNL 资料，也可自定义。Work out how thick your insulation needs to be from a target R-value, any existing R-value and the material's R-value per inch, with the total volume and the number of bags or packs from the coverage on the label. Material R-values come from US DOE and PNNL references, or enter your own.
使用说明与常见问题How-to & FAQ
「保温层厚度与用量计算器」是什么？What is the Insulation Calculator tool?
按目标 R 值、现有 R 值和保温材料的每英寸 R 值，计算还需要多厚的保温层、总体积，以及按包装覆盖面积需要几包；材料 R 值取自美国能源部和 PNNL 资料，也可自定义。Work out how thick your insulation needs to be from a target R-value, any existing R-value and the material's R-value per inch, with the total volume and the number of bags or packs from the coverage on the label. Material R-values come from US DOE and PNNL references, or enter your own.
如何使用「保温层厚度与用量计算器」？How do I use the Insulation Calculator tool?
在「保温层厚度与用量计算器」中，填写「面积单位」、「面积」、「目标 R 值（英制）」、「现有 R 值（英制）」、「材料」等参数，结果会随输入实时计算并显示在下方。In the Insulation Calculator: Fill in "Area units", "Area", "Target R-value (imperial)", "Existing R-value (imperial)", "Material"; results are recalculated instantly as you type.
所需厚度怎么算？How is the thickness worked out?
保温层的 R 值大致与厚度成正比：需要的厚度 = (目标 R 值 − 现有 R 值) ÷ 材料每英寸 R 值。例如从 R-11 加到 R-49 需要增加 R-38，用每英寸约 3.5 的纤维素约需 10.9 英寸。Insulation R-value scales roughly with thickness: thickness = (target R − existing R) ÷ the material's R per inch. Going from R-11 to R-49 means adding R-38, which with cellulose at about 3.5 per inch takes about 10.9 inches.
材料 R 值从哪来？Where do the material R-values come from?
来自美国 PNNL「Building America Solution Center」的常见保温材料 R 值表和松散填充资料（引自美国能源部），以及美国能源部《Guide to Home Insulation》。计算取区间中值；松散填充值是沉降后的 R 值。实际产品以标签为准，可改用自定义。From the US PNNL Building America Solution Center tables of typical R-values and its loose-fill guide (citing the US Department of Energy), and the DOE Guide to Home Insulation. The middle of each range is used; loose-fill figures are settled values. Real products vary, so check the label or use Custom.
R 值和 RSI 怎么换算？How do R-value and RSI convert?
美国常用英制 R 值（ft²·°F·h/Btu），1 个英制 R 值 = 0.1761 m²·K/W（RSI）。例如 R-49 ≈ RSI 8.63。US R-values are imperial (ft²·°F·h/Btu); 1 imperial R = 0.1761 m²·K/W (RSI). R-49 is about RSI 8.63.
「保温层厚度与用量计算器」免费吗？需要注册吗？Is the Insulation Calculator free? Do I need an account?
「保温层厚度与用量计算器」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 Insulation Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.