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Steel calculator
Rebar Weight Calculator
Work out how much steel reinforcement you need. Select bar diameter (6–32 mm), count and length for linear weight, or switch to mesh/fabric sheets. Add wastage and optionally estimate cost.
Read the guide: Rebar Weight Calculator.
Free to use. No registration required.
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How do you calculate rebar weight?
For steel reinforcing bars, weight per metre ≈ d² ÷ 162, where d is the bar diameter in millimetres. Multiply by the total length of all bars to get the net weight in kilograms. Divide by 1,000 for tonnes.
What does H12 or H16 mean?
In UK practice, H12 means a high-yield deformed bar with a 12 mm nominal diameter; H16 is 16 mm, and so on. This calculator uses those diameters (6–32 mm) with the standard d²/162 mass rule.
How much does A393 mesh weigh?
A393 fabric has a nominal mass of about 6.16 kg/m². A standard 4.8 × 2.4 m sheet is roughly 11.5 m², so about 71 kg per sheet before laps and wastage. Other fabrics (A142, A252, B and C meshes) use different kg/m² figures — pick the type or enter a custom mass.
Should I add wastage for reinforcement?
Yes for ordering. Cutting, laps, chairs and offcuts typically add a few percent. Enter a wastage / lap allowance and the calculator scales the order weight accordingly.
How do I estimate rebar cost?
Enter a price per tonne or per kilogram. Cost = total order weight × unit price. Figures exclude fabrication, delivery, couplers and VAT unless those are already in your rate.
Can I calculate mesh and bars in one place?
This tool has two modes: reinforcing bars and mesh/fabric. Switch mode to weigh either linear bars or sheet fabric using the same wastage and cost fields.