Rough kilograms of steel bars (sarya) for slabs, beams, columns and footings, and how many 12 m bars.
How this works
Typical steel per m³ of concrete: slab 80 kg, footing 70 kg, beam 140 kg, column 180 kg. Bar weight per metre is d² / 162 kg, with d in mm (so a 12 mm bar is 0.89 kg per m, 10.7 kg per 12 m bar).
Questions people ask
How do I use the Steel Rebar Estimate tool?
Fill in the fields, starting with “Element”, “Concrete volume” and “Main bar size”, and change any other options that match your home. The answer, a drawing and practical tips update as you type, and the Copy link button saves your numbers in a link you can share.
Is the Steel Rebar Estimate tool free?
Yes. The Steel Rebar Estimate tool is free, with no sign-up, and works on phones, tablets and computers. The results are estimates to help you plan, so check with a qualified professional before structural, electrical, gas or plumbing work.