楼板用什么规格的钢筋？

3 号或 4 号能覆盖绝大多数住宅楼板、露台和车道，4 号最常用。基础和结构构件通常要求 5 号以上，这属于结构设计范畴。

钢筋编号是什么意思？

编号表示直径的八分之几英寸。4 号是 4/8 即半英寸，8 号则是整整一英寸。重量随直径的平方增长。

楼板钢筋间距多少？

住宅工程双向 30–45 厘米中心距较为常见。加密只是让裂缝分布更细，并不能杜绝开裂。实际数值由当地规范确定。

钢筋搭接要多长？

ACI 318 在多数情况下要求至少 40 倍直径的搭接长度，4 号筋约 50 厘米。搭接处必须绑扎，不能只是并排放置。

钢筋应该放在楼板的什么位置？

受弯楼板应放在厚度的中间三分之一处，10 厘米厚的板大约离底 5 厘米。直接躺在地基上的钢筋不起作用，请使用马凳。

钢筋计算器

计算楼板或基础的钢筋用量：双向根数、总长度、按规格计算的重量以及需要绑扎的交叉点数量。

公式与数据最后核对于 2026年8月6日 — Cosyslabs

输入

楼板长度(ft)

楼板宽度(ft)

网片间距（中心距）(in)

钢筋规格

搭接附加量(%)

每英尺单价（选填）($)

Result

Total rebar

512 linear ft

Bars

13 × 20.0 ft + 21 × 12.0 ft

Bar size: #4 (0.668 lb/ft)
Total weight: 342 lb
Tie wire intersections: 273
Grid spacing: 12.0 in on centre

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

单向根数 = 向下取整(跨度 ÷ 间距) + 1   ·   重量 = 总长度 × 该规格每英尺重量

参考资料

Measure what the tool asks for
This calculator works from 楼板长度 in ft, 楼板宽度 in ft and 网片间距（中心距） in 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
单向根数 = 向下取整(跨度 ÷ 间距) + 1 · 重量 = 总长度 × 该规格每英尺重量 Every figure on the page comes out of that one expression, so you can check it by hand.
Choosing a 钢筋规格
提示：编号表示直径的八分之几英寸。4 号即 4/8 英寸（半英寸），是住宅楼板的常用规格。
Where the numbers come from
The constants are taken from ACI 318 — Building Code Requirements for Structural Concrete and CRSI — Manual of Standard Practice (bar sizes and weights), 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.

Related tools & materials

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钢筋马凳
绑扎丝
钢筋剪
垫块
钢丝网

Also useful

Astrilio Property Calculators

常见问题

把每个跨度除以间距再加一，得到该方向的根数，再乘以其长度。6 × 3.6 米的楼板按 30 厘米间距约需 156 米。

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Cite this page

Cosyslabs. (2026). 钢筋计算器. Rough Estimator!. https://roughestimator.com/zh/rebar-calculator

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