Rebar Mat & Grid Calculator

Lay out a rectangular reinforcement mat and get the full bar take-off: bars in each direction, intersections for tying, total bar length and weight.

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How to use: Rebar Mat & Grid Calculator

Enter mat length and width.
Set the grid spacing and edge offset.
Pick a bar size for the totals.

Formula

Bars each way = floor((dimension − 2 × offset) ÷ spacing) + 1. Intersections = nx × ny.

See the full rebar weight chart (kg/m & lb/ft) →

Rebar Mat & Grid Calculator — FAQ

What is a rebar mat?

A grid of bars tied together in two directions, used in slabs, rafts and footings.

How many tie points are in a mat?

One at each bar intersection — the calculator reports this as the intersection count.