Rebar Foundation Calculator — Concrete-Depot.com

Measurement inputs

Live calculation

Project nameUsed in the saved report.

Foundation typeThis changes the preview label. The grid math stays based on length and width/height.

Foundation length

Enter a length greater than 0.

Foundation width

Enter a width greater than 0.

Bar spacing across width

Rows of bars running lengthwise.Enter spacing greater than 0.

Bar spacing across length

Rows of bars running crosswise.Enter spacing greater than 0.

Concrete cover from edge

Cover cannot be negative.

Rebar size

Stock bar length

Enter a stock bar length greater than 0.

Lap overlap

Used when a run is longer than one stock bar.Lap cannot be negative.

Waste allowance

Waste cannot be negative.

Cost per stock bar

Optional.Cost cannot be negative.

This is a material estimate only. Always confirm rebar size, spacing, cover, lap length, and code needs with your engineer or local building department.

Total stock bars

–

Enter valid measurements to calculate the rebar estimate.

Total rebar length–

Weight estimate–

Lengthwise bars–

Crosswise bars–

Lap allowance–

Estimated cost–

Formula used

Clear length = length − 2 × cover. Clear width = width − 2 × cover. Bars = floor(clear span ÷ spacing) + 1. Total length = bar rows × run length, plus lap overlaps and waste.

Calculation steps

Enter valid values to see steps.