Rebar Calculator
Calculate rebar bars needed for a concrete slab. Enter slab dimensions and bar spacing.
How to Use the Rebar Calculator
- Enter the slab length and width in meters.
- Enter the bar spacing in centimeters.
- Click Calculate to see bars needed in both directions.
- Use the total length to order rebar.
快速参考
| 从 | 到 |
|---|---|
| 15 cm spacing | ~44 bars/m² (both dirs) |
| 20 cm spacing | ~25 bars/m² |
| 30 cm spacing | ~11 bars/m² |
| 10 mm rebar | 0.617 kg/m |
| 12 mm rebar | 0.888 kg/m |
| 16 mm rebar | 1.578 kg/m |
使用场景
- •Reinforcing a concrete slab or foundation.
- •Estimating rebar for a garage floor.
- •Planning structural reinforcement.
- •Ordering rebar for construction projects.
公式
Bars (lengthwise) = floor(Width / Spacing) + 1. Bars (widthwise) = floor(Length / Spacing) + 1. Total length = sum of all bar lengths.
常见问题
What is typical rebar spacing?
Common spacing is 15–30 cm depending on structural requirements.
What rebar diameter should I use?
Residential slabs typically use 10–12 mm diameter bars.
Is it free?
Yes, all calculators are completely free.