Rebar Weight Calculator
Weight of reinforcement bars from diameter, length and quantity.
Results
Mass
426.14
kg
Weight per metre
0.8878
kg/m
Mass
10.654
kg
Length
480.0
m
What this tool does
The constant 162.2 comes straight from the density of steel and the area of a circle, which is why the familiar shortcut d²/162 works for every diameter. Steel is ordered by weight but detailed by length, so this is the conversion between the drawing and the invoice.
Formula
kg/m = d² ÷ 162.2 (steel, d in mm)
Variables
| Symbol | Meaning | Unit |
|---|---|---|
d | Diameter | mm |
l | Length | m |
n | Quantity | — |
W | Mass | kg |
WM | Weight per metre | kg/m |
WB | Mass | kg |
TL | Length | m |
Worked example
- Diameter12 mm
- Length12 m
- Quantity40
- Mass426.14 kg
- Weight per metre0.8878 kg/m
- Mass10.654 kg
- Length480.0 m
Limitations
- For work that must comply with a standard or be signed off, check the result against the applicable code and have it reviewed by a qualified engineer.
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.