Wall Rebar Calculator

Estimate the steel in a wall — retaining, basement or block. Enter the wall length and height, the vertical and horizontal spacing and bar sizes, and get the bar counts and total weight.

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How to use: Wall Rebar Calculator

Enter wall length and height.
Set vertical and horizontal spacing and cover.
Pick bar sizes for each direction.

Formula

Vertical bars = floor((L − 2cover) ÷ spV) + 1; horizontal bars = floor((H − 2cover) ÷ spH) + 1; sum × kg/m.

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

Wall Rebar Calculator — FAQ

How do you calculate rebar for a wall?

Count vertical and horizontal bars from the spacing, then multiply lengths by unit weight.

What is rebar spacing in a block wall?

Often vertical bars at 400–800 mm and horizontal bars per course or bond beam — design governs.