Example: Slab length: 20 ft · Slab width: 10 ft · Grid spacing: 12 in → Total rebar: 474 linear ft (with 10% laps).
20 ft sticks: 24
Grid: 11 × 21 bars
Frequently asked questions
How do I calculate rebar? Enter your numbers above and the result updates instantly. For example: Slab length: 20 ft · Slab width: 10 ft · Grid spacing: 12 in → Total rebar: 474 linear ft (with 10% laps).
Is this Rebar Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for rebar. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.