Rebar Calculator

Slab Grid • Spacing → Count Sticks (20ft) • Laps • Weight

Pick a mode, enter values, and get counts + sticks + weight (print-safe).

Tip: Results appear below the button. Changing modes hides results automatically.
Slab Rebar Grid
Bar counts in both directions + total length + sticks + weight.

Dimensions

Defaults + Weight

Stick length: 20ft. Lap: 24in. Cover: 3in. Waste: 10% (editable).
Spacing → Bar Count
Quick bar count along one dimension (with edge cover).

Inputs

Notes

We subtract edge cover from both sides, then place bars every spacing (on-center) across the usable span. You’ll get a bar at each end of the usable span when possible.

Usable span = dimension − 2×cover.

Stick Count + Weight
Estimate sticks using laps + compute weight from lb/ft constants.

Total Length

Lap splices reduce effective coverage. After the first stick, each additional stick adds about (stick length − lap) of new coverage.

Laps + Waste + Weight