FREE ONLINE CALCULATOR

Rebar Calculator

Estimate the number of rebar grid runs and total linear feet in a rectangular slab.

✓ Instant results ✓ Editable inputs ✓ Formula explained

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CONSTRUCTION · TOOLS

MEASURE Enter project dimensions

ESTIMATE Calculate material volume

PLAN Check practical assumptions

CALCULATION TOOL

Rebar Calculator

Change any value and calculate again.

Uses the values you enter. No account required.

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ABOUT THIS TOOL

When to use a rebar calculator

Estimate the number of rebar grid runs and total linear feet in a rectangular slab.

All assumptions are visible and adjustable. Check rates and underlying data against original sources before making a decision.

HOW IT WORKS

The calculation

Count of bars parallel to length = ceil(width × 12/spacing) + 1; parallel to width = ceil(length × 12/spacing) + 1; total linear feet = sum of runs × (1 + waste%).

Read the full guide →

ASSUMPTIONS

Know the limitations

Does not check structural design, bar size, required lap development length, support chairs, covers or codes.

Results are estimates derived from your inputs.