Rebar Spacing Calculator

Convert between bar count and spacing across a member. Enter the width, edge cover and your target spacing, and get the exact number of bars, the actual c/c spacing achieved and the clear gap.

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How to use: Rebar Spacing Calculator

Enter the total width and edge cover.
Enter the desired spacing.
Read the bar count and actual spacing.

Formula

Number of bars = floor((width − 2 × cover) ÷ spacing) + 1. Actual spacing = reinforced width ÷ (bars − 1).

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

Rebar Spacing Calculator — FAQ

How do you calculate rebar spacing?

Subtract cover from the width, divide by spacing, add one for the number of bars.

What is the minimum spacing between rebars?

Usually the greater of the bar diameter or aggregate size + 5 mm — check your code.