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🚚 货运等级（NMFC 密度等级）计算器Freight Class Calculator
按货物尺寸和重量计算密度（磅/立方英尺），并按 NMFC 2025 年 7 月起施行的 13 档密度分级表确定 LTL 零担货运等级（50–400），支持英寸/磅和厘米/千克，可输入多件。Calculate shipment density in lb/ft³ from the dimensions and weight, and find the LTL freight class (50–400) on the 13-tier NMFC density scale in effect from July 2025, in inches and pounds or centimetres and kilograms, for several identical pieces.
使用说明与常见问题How-to & FAQ
「货运等级（NMFC 密度等级）计算器」是什么？What is the Freight Class Calculator tool?
按货物尺寸和重量计算密度（磅/立方英尺），并按 NMFC 2025 年 7 月起施行的 13 档密度分级表确定 LTL 零担货运等级（50–400），支持英寸/磅和厘米/千克，可输入多件。Calculate shipment density in lb/ft³ from the dimensions and weight, and find the LTL freight class (50–400) on the 13-tier NMFC density scale in effect from July 2025, in inches and pounds or centimetres and kilograms, for several identical pieces.
如何使用「货运等级（NMFC 密度等级）计算器」？How do I use the Freight Class Calculator tool?
在「货运等级（NMFC 密度等级）计算器」中，填写「单位制」、「长度（英寸/厘米）」、「宽度（英寸/厘米）」、「高度（英寸/厘米）」、「每件重量（磅/千克）」等参数，结果会随输入实时计算并显示在下方。In the Freight Class Calculator: Fill in "Units", "Length (in / cm)", "Width (in / cm)", "Height (in / cm)", "Weight per piece (lb / kg)"; results are recalculated instantly as you type.
货运等级怎么确定？How is the class determined?
先算密度 = 总重量（磅）÷ 总体积（立方英尺，英寸相乘后 ÷ 1,728），再查 NMFC 13 档密度表：≥50 为 50 级，35–50 为 55，30–35 为 60，22.5–30 为 65，15–22.5 为 70，12–15 为 85，10–12 为 92.5，8–10 为 100，6–8 为 125，4–6 为 175，2–4 为 250，1–2 为 300，<1 为 400。Density = total weight (lb) ÷ total volume (ft³; multiply inches and divide by 1,728), then the 13-tier NMFC scale: ≥50 is class 50, 35–50 is 55, 30–35 is 60, 22.5–30 is 65, 15–22.5 is 70, 12–15 is 85, 10–12 is 92.5, 8–10 is 100, 6–8 is 125, 4–6 is 175, 2–4 is 250, 1–2 is 300 and under 1 is 400.
这个分级表从什么时候开始用？When did this scale take effect?
NMFTA 在 2025 年 7 月 19 日实施的 Docket 2025-1 中把大量商品改为按密度定级，并采用上面的 13 档标准密度表；NMFTA 网站文章《Decoding Density》（2025）列出了同样的分档。NMFTA's Docket 2025-1, effective 19 July 2025, moved many commodities to density-based classes using the 13-tier standard density scale above; NMFTA's 2025 article 'Decoding Density' lists the same bands.
尺寸要量什么？Which dimensions should I measure?
按 NMFTA 的测量方法，在货物最外端（extreme dimensions）量整件货（含托盘、包装和突出部分）最长、最宽、最高处，不规则货物按外接长方体计算（承运商规则如 ODFL 100 Item 490 也是这样定义体积）。把每个尺寸向上取整到整英寸是许多承运商规则和测量设备的做法，不是 NMFC 条文，所以工具默认按输入值计算，可勾选取整。Following NMFTA's method, measure the whole handling unit at its extreme dimensions — including pallet, packaging and projections — at its longest, widest and tallest points; irregular items use their bounding box (carrier rules such as ODFL 100 Item 490 define the cube this way). Rounding each dimension up to a whole inch is a practice of many carriers' rules and dimensioners, not NMFC text, so the tool uses your figures unless you tick the rounding option.
「货运等级（NMFC 密度等级）计算器」免费吗？需要注册吗？Is the Freight Class Calculator free? Do I need an account?
「货运等级（NMFC 密度等级）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 Freight Class 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.