GlenCalc

Concrete steps calculator

Each step is a solid block from the ground up, so the bottom step is the longest. Add a platform at the top if there is one.

Pick the conditions closest to your job. Each adds the allowance shown for offcuts, breakage and uneven ground. Choose Custom to enter your own.

Your answer

Concrete0.87 cubic yards
80 lb bags40
In cubic feet23.53 cu ft

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How we worked it out

Updated as you change the numbers.

  1. Volume = Σ (step number × riser × tread × width) + landing × total rise × width, plus waste.
A flight of stairs: risers, treads, total rise, total run and the stringer along the slopetreadrisertotal runtotalrisestringer

Method and assumptions

Seen from the side, poured steps form a staircase of rectangles stacked from the ground; the k-th step from the top stands k risers tall. This ignores any hollow fill, which can cut concrete for tall steps.

Questions

How much concrete for 4 steps, 7 in risers, 11 in treads, 4 ft wide?

About 0.87 cubic yards with 10% extra, or 40 bags of 80 lb.

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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