6/12 坡度是什么意思？

水平每前进 30 厘米，屋面升高 15 厘米。相当于 26.57 度，坡度系数 1.118，即实际屋面比投影面积大约 12%。

坡度系数有什么用？

它是把平面投影面积换算成实际屋面面积的乘数。只按投影面积订瓦，一定会短缺。

坡度怎么换算成角度？

取升高除以水平距离的反正切。4/12 坡度为 arctan(4/12) = 18.4 度，12/12 正好是 45 度。

多陡的屋面还能走人？

大约 7/12 以内多数工人可徒手行走。8/12 到 9/12 通常需要屋面梯或安全带，再陡就必须搭设脚手架。

坡度如何影响造价？

影响是双重的：同样的投影面积屋面更大，而且一旦不能徒手行走，人工费就上涨。超过 8/12 时很多施工方会加收 20% 以上。

屋面坡度计算器

在坡度比、角度和百分比之间换算，并给出把建筑投影面积换算为实际屋面面积的坡度系数。

公式与数据最后核对于 2026年8月6日 — Cosyslabs

输入

我已知

升高(in)

水平距离(in)

角度（角度模式）(°)

Result

Pitch

6.0:12

Angle

26.6°

Pitch factor

1.1180

Slope (grade): 50.0%
Area multiplier: × 1.1180 on plan area
Working conditions: Generally walkable — most roofers work this unaided.

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

坡度系数 = √(1 + (升高 ÷ 12)²)   ·   角度 = arctan(升高 ÷ 水平距离)

参考资料

Measure what the tool asks for
This calculator works from 升高 in in, 水平距离 in in and 角度（角度模式） in °. 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
坡度系数 = √(1 + (升高 ÷ 12)²) · 角度 = arctan(升高 ÷ 水平距离) Every figure on the page comes out of that one expression, so you can check it by hand.
Choosing a 我已知
The 我已知 changes the result, so pick the one that matches what you are actually buying rather than leaving the default.
Where the numbers come from
The constants are taken from NRCA Roofing Manual — Steep-slope roof systems and IRC R905 — Requirements for roof coverings by slope, 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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角尺
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屋面安全带

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常见问题

把水平仪水平贴在屋面上，沿其量出 30 厘米作记号，再从记号垂直向下量到屋面。这个距离（英寸）就是每 12 英寸的升高。

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Cite this page

Cosyslabs. (2026). 屋面坡度计算器. Rough Estimator!. https://roughestimator.com/zh/roof-pitch-calculator

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