Enter your sizes
| Diameter | Length of one bar (m) | Number | Weight | |
|---|---|---|---|---|
Result
Weight per metre = D² ÷ 162 (D in mm), from steel density 7850 kg/m³. Actual bars can vary slightly within the tolerance allowed by IS 1786.
How it’s calculated
Standard weights (D²/162)
| Bar | kg per m | kg per 12 m bar | Bars per tonne (12 m) |
|---|---|---|---|
| 6 mm | 0.222 | 2.67 | 375.0 |
| 8 mm | 0.395 | 4.74 | 210.9 |
| 10 mm | 0.617 | 7.41 | 135.0 |
| 12 mm | 0.889 | 10.67 | 93.8 |
| 16 mm | 1.580 | 18.96 | 52.7 |
| 20 mm | 2.469 | 29.63 | 33.8 |
| 25 mm | 3.858 | 46.30 | 21.6 |
| 32 mm | 6.321 | 75.85 | 13.2 |
Questions
Where does D²/162 come from?
Weight of 1 m of bar = area × density = (π/4 × D² mm²) × 7850 kg/m³ = D² × 0.006165 kg/m ≈ D² ÷ 162.
What is the weight of a 12 mm bar?
12² ÷ 162 = 0.889 kg per metre, so a 12 m bar weighs about 10.67 kg.
How many 12 m bars are in one tonne?
About 94 bars of 12 mm, 53 of 16 mm, 34 of 20 mm and 135 of 10 mm — see the table above.
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