For solid concrete steps poured on the ground — such as porch or patio steps — each step sits on top of the ones below. Enter the number of steps, the rise and run of each step and the stair width to estimate the concrete.
This assumes solid steps with no landing. Add a landing separately with the concrete slab calculator.
Formula
Volume = Rise × Run × Width × n(n + 1) ÷ 2
The bottom step is one rise tall, the next is two rises tall, and so on, so the total is 1 + 2 + … + n = n(n + 1) ÷ 2 blocks of rise × run × width.
Worked example
Four steps, each 7 in high and 11 in deep, 4 ft wide: (7/12) × (11/12) × 4 × 10 = 21.39 ft³. With 10% extra that is 23.53 ft³ (0.87 yd³), or 40 bags of 80 lb mix.
Frequently asked questions
What is a comfortable step size?
A rise of about 6–7.5 inches (15–19 cm) and a run of 11–12 inches (28–30 cm) is comfortable for outdoor steps. Keep every step the same height.
Should concrete steps have reinforcement?
Yes — rebar or mesh helps prevent cracking, and steps attached to a house usually need footings below the frost line. Follow local building codes.
Last updated · Calculations checked by automated tests· Editorial policy