How the Slab Steel Estimate works
Bars each way = span ÷ spacing + 1; weight = total length × D² ÷ 162.2.
How to use this calculator
- Sign up free and verify your email to unlock the calculator.
- Choose Metric (m, mm, m³, kg) or Imperial (ft, in, cft, lb) units.
- Enter the span (main bars), width, main bar dia, main spacing, dist. bar dia, dist. spacing.
- Results update instantly — read the quantities in the Results panel.
- Add a wastage allowance and confirm against your drawings and specifications before ordering.
Typical uses
Quick steel estimate for two-way slabs.
Assumptions & limitations
Results are planning estimates based on standard assumptions for steel & rebar work. They do not replace structural design, site measurement or project specifications. Material densities, wastage and mix proportions vary by region and supplier.
Frequently asked questions
- How does the Slab Steel Estimate work?
- Bars each way = span ÷ spacing + 1; weight = total length × D² ÷ 162.2.
- Can I use the Slab Steel Estimate in feet and inches?
- Yes. Switch to Imperial and enter feet, inches, square feet or pounds — the calculator converts automatically and shows results in imperial units.
- When should I use the Slab Steel Estimate?
- Quick steel estimate for two-way slabs.
- Is this construction calculator free?
- Yes. All CM PRO construction calculators are free — you only need to sign up and verify your email.
Related searches: slab steel calculator, slab reinforcement quantity, steel in slab.
