Does this assume solid steps?

Yes — it estimates solid poured steps. If you're filling a hollow form or using fill inside, you'll need less concrete.

Concrete Steps Calculator

Estimate the concrete for a solid set of steps — in cubic feet, cubic yards and bags.

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Each step is a box that gets taller toward the top; we add them all up:

Volume = Width × run × rise × (n × (n+1) ÷ 2)

3 steps, 4 ft wide, 7 in rise and 11 in run use about 12.8 cubic feet (~21 × 80-lb bags).

Does this assume solid steps?: Yes — it estimates solid poured steps. If you're filling a hollow form or using fill inside, you'll need less concrete.