Slab Steel Quantity Estimator
Quick kg of rebar in a slab by area, thickness and the standard percentage.
Thumb: residential slabs land at 3.5–4.5 kg/sqft? No — that's per m²! Expect ~9–12 kg/m² (0.85–1.1 kg/sqft). Estimators who mix the two lose tenders.
Formula
Slab Steel Quantity Estimator is a free slab steel quantity for structural engineers, fabricators and site engineers — 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 Slab Steel Quantity Estimator
Quick kg of rebar in a slab by area, thickness and the standard percentage. The calculation implements kg = A·t·(%/100)·7850 (CPWD analysis of rates; estimation practice). Thumb: residential slabs land at 3.5–4.5 kg/sqft? No — that's per m²! Expect ~9–12 kg/m² (0.85–1.1 kg/sqft). Estimators who mix the two lose tenders.
How to use Slab Steel Quantity Estimator
- 1Enter Slab area in m².
- 2Enter Slab thickness in mm.
- 3Enter Steel percentage in % of volume (Slabs 0.7–1.0% · rafts 0.6–0.8%).
- 4Read Steel quantity, Per m², Per sq ft instantly — no submit button needed.
- 5Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Slab Steel Quantity Estimator?
- ✓Implements the standard formula — kg = A·t·(%/100)·7850
- ✓Reference cited on-page: CPWD analysis of rates; estimation practice
- ✓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 Slab Steel Quantity Estimator use?+
It computes kg = A·t·(%/100)·7850, per CPWD analysis of rates; estimation practice. 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?+
Thumb: residential slabs land at 3.5–4.5 kg/sqft? No — that's per m²! Expect ~9–12 kg/m² (0.85–1.1 kg/sqft). Estimators who mix the two lose tenders.
Can I use this for real structural design?+
It implements the exact textbook/code formula cited below the result and is ideal for sizing, checking and learning. Final designs should be verified by a qualified engineer against the full code with all load cases.
Is the Slab Steel Quantity Estimator 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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