Concrete Stairs Calculator

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in
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Construction

Calculate the volume of concrete needed to pour a set of exterior concrete stairs.

Formula

Volume = Σ(riser × tread × step_number × width) for each step
  • Staircase volume increases with each step level.
  • Add 10% for waste.
  • Minimum tread 10 in, maximum riser 7.75 in per IRC building code.

4 steps, 7 in riser, 11 in tread, 4 ft wide

Inputs
  • Number of Steps: 4
  • Riser Height: 7 in
  • Tread Depth: 11 in
  • Stair Width: 4 ft

Step 1: 0.583×0.917×1×4=2.14; Step 2: ×2=4.28; Step 3: ×3=6.42; Step 4: ×4=8.57. Total≈21.4 cu ft.

Frequently asked questions

Can I pour concrete stairs in cold weather?
Avoid pouring when temperature is below 40°F without special cold-weather precautions and curing blankets.