Engineering & Construction
Rebar Spacing Calculator
Count bars from the clear distance inside the cover and a centre-to-centre spacing. The first and last bars sit at the cover.
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This runs entirely in your browser. Nothing you type is sent to a server.
How to use the Rebar Spacing Calculator
- 1Enter the span and the cover at each side.
- 2Enter the centre-to-centre spacing.
- 3Read how many bars fit.
Questions
How is the count worked out?
floor((span − 2 × cover) / spacing) + 1.
Why is the last gap sometimes smaller?
The bars are placed from the cover at the spacing you set. The remainder stays inside the far cover.