Rebar Calculators

Rebar Calculator

Estimate Your Rebar Materials

Rebar (reinforcing bar) strengthens concrete by adding tensile strength — concrete is strong in compression but weak in tension. The Rebar Calculator estimates bar count, linear feet, piece count (in standard 20-foot lengths), and total weight for slab and footing reinforcement. Supports #3 through #8 bar sizes with six spacing options.

Calculator

Rebar Calculator

Bar count, linear feet, and weight for concrete slab and footing reinforcement. Supports #3 through #8 bar sizes with adjustable spacing.

Rebar goes inside concrete — calculate the concrete volume first, then the rebar. For slab projects, the Slab Calculator gives you the concrete, and this calculator gives you the steel. Gravel forms the compacted base beneath the slab.