Concrete Stairs Calculator

What is Concrete Stairs Calculator?

Estimate concrete volume for a straight flight of concrete stairs from steps, tread, riser, throat depth and width.

How to use the calculator

1. Enter the project dimensions and quantities.
2. Choose the correct unit for each measurement.
3. Review the calculated result and waste allowance.
4. Check the estimate against project specifications.

Formula and calculation method

Sloping length = √(Riser² + Tread²); Volume = Steps × [(Riser × Tread ÷ 2) + (Sloping length × Throat)] × Width.

Worked example

Enter representative project measurements, apply the formula shown above, and compare the calculated quantity with the purchase quantity after waste is added.

Measurement and unit explanation

Use one unit per input and confirm whether the output is cubic meters, cubic feet, cubic yards, liters, kilograms, pounds, tonnes, square meters, or block count as applicable.

Accuracy and assumptions

This estimates a straight stair flight only. It does not determine stair proportions, reinforcement, landings, support conditions or code compliance. Results are estimates and should be checked against actual site dimensions, material specifications, waste, joints, openings, moisture, and professional requirements.