Steel Bar Weight Calculator (TMT rebar)
Find the weight of steel bars from diameter (8, 10, 12, 16 mm…) and length. For buying and checking bills.
Quick answer
One 12 mm bar, 12 m long: 10.67 kg.
How it is calculated
- Weight per metre = diameter² ÷ 162 kg. 12 mm: 144 ÷ 162 = 0.889 kg/m.
- Total = weight per metre × length × number of bars.
- A bar is usually 12 m (about 40 ft) long.
Worked example
One 12 mm bar, 12 m long: 0.889 kg/m per metre, 10.67 kg in total.
| Bar diameter | 12 mm |
| Length per bar | 12 m |
| Number of bars | 1 |
| Total weight | 10.67 kg |
| Weight per metre | 0.889 kg/m |
Formula
Weight (kg/m) = D² / 162
Total weight = Dm^2/162×Ln×Nb Weight per metre = Dm^2/162
Good to know
- The D²/162 formula comes from steel’s density (7,850 kg/m³).
- Bars per bundle vary by brand; check by weight.
Questions people ask
Weight of 1 m of 12 mm bar?
About 0.889 kg.
Weight of a 12 m, 8 mm bar?
64 ÷ 162 × 12 ≈ 4.74 kg.
How many 12 mm bars in 1 tonne?
1,000 ÷ 10.67 ≈ 94 bars (12 m each).
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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0