一根 2×4×8 有多少板英尺？

5.33 板英尺。算式为 (2 × 4 × 8) ÷ 12 = 5.33。

为什么 2×4 实际不是 2 乘 4 英寸？

因为名称来自烘干刨光前的毛料尺寸。成品 2×4 实测 1.5 × 3.5 英寸，但你付的是锯出来时的木料。

窑干木材是什么意思？

指在控温窑内干燥到含水率 19% 以下。它比湿木稳定得多，湿木横纹方向可收缩 5%–7%。

应该买什么等级的木材？

受力部位用结构优选或一级，普通框架用二级，非承重隔墙用三级。等级直接决定允许跨度。

木材大概多少钱？

2025 年一根云杉 2×4×92 5/8 立柱约 3–5 美元。2020 年以来价格波动剧烈，几周前的报价已不可靠。

木材计算器

计算任意木材订单的板英尺、线性英尺与成本。适用于框架、露台、线条以及不同供应商的比价。

公式与数据最后核对于 2026年8月6日 — Cosyslabs

输入

数量

厚度(in)

宽度(in)

长度(ft)

每板英尺单价（选填）($)

Result

Board feet

53.3 BF

Linear feet

80.0 ft

Pieces

Each piece: 2" × 4" × 8'

Diagram

Estimates only. Verify with a licensed contractor or supplier before purchasing. Rough Estimator! is not responsible for shortages, overages, or material variances. See our methodology for formulas and sources.

公式

板英尺 = (厚 × 宽 × 长) ÷ 12（厚宽以英寸计，长以英尺计）

参考资料

Measure what the tool asks for
This calculator works from 厚度 in in, 宽度 in in and 长度 in ft. Measure the finished area you are covering, not the material — an estimate is only as good as the dimensions you feed it.
What it does with those numbers
板英尺 = (厚 × 宽 × 长) ÷ 12（厚宽以英寸计，长以英尺计） Every figure on the page comes out of that one expression, so you can check it by hand.
Where the numbers come from
The constants are taken from USDA Forest Products Laboratory — Wood Handbook, National Hardwood Lumber Association — Rules for the Measurement and Inspection of Hardwood and PS 20 — American Softwood Lumber Standard (nominal vs actual sizes), linked in full below. If a figure here disagrees with your supplier's spec sheet, use the spec sheet — it describes the product you are buying.
What this will not tell you
This is a material takeoff, not a bid. It does not price labour, permits, delivery, equipment hire or site preparation, and it assumes a straightforward layout. Complex cuts, difficult access and awkward shapes all cost more than the geometry suggests.

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常见问题

一个体积单位，等于 144 立方英寸：厚 1 英寸、宽 12 英寸、长 12 英寸的一块木料。所以同长度的 1×12 与 2×6 板英尺相同。

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Cite this page

Cosyslabs. (2026). 木材计算器. Rough Estimator!. https://roughestimator.com/zh/lumber-calculator

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