Rebar Quantity in Slab Calculator
Total bars and steel weight for a two-way mesh from spacing.
10 mm @150 c/c two-way ≈ 8.2 kg/m² — sits right in the 9–12 kg/m² slab band once you add chairs and laps. Don't forget the SECOND mat over supports in continuous slabs.
Formula
Rebar Quantity in Slab Calculator is a free rebar in slab for civil engineers, contractors and quantity surveyors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Rebar Quantity in Slab Calculator
Total bars and steel weight for a two-way mesh from spacing. The calculation implements bars = span/spacing + 1 each way; weight by d²/162 + 5% laps (BBS practice; IS 2502). 10 mm @150 c/c two-way ≈ 8.2 kg/m² — sits right in the 9–12 kg/m² slab band once you add chairs and laps. Don't forget the SECOND mat over supports in continuous slabs.
How to use Rebar Quantity in Slab Calculator
- 1Enter Slab length in m.
- 2Enter Slab width in m.
- 3Enter Bar diameter in mm.
- 4Enter Spacing both ways in mm.
- 5Read Total bars, Steel weight (+5% laps) instantly — no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Rebar Quantity in Slab Calculator?
- ✓Implements the standard formula — bars = span/spacing + 1 each way; weight by d²/162 + 5% laps
- ✓Reference cited on-page: BBS practice; IS 2502
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Rebar Quantity in Slab Calculator use?+
It computes bars = span/spacing + 1 each way; weight by d²/162 + 5% laps, per BBS practice; IS 2502. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
10 mm @150 c/c two-way ≈ 8.2 kg/m² — sits right in the 9–12 kg/m² slab band once you add chairs and laps. Don't forget the SECOND mat over supports in continuous slabs.
Does it include wastage?+
Yes — standard wastage/bulking factors are built in and stated in the formula line, so the quantity is an orderable number, not a bare geometric volume.
Is the Rebar Quantity in Slab Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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