Stair Calculator
Enter the total vertical rise to calculate the number of steps, the rise per step, and the total run of your staircase.
Results
- Number of steps
- 14
- Riser height
- 7.71 in
- Total run
- 130 in (10.83 ft)
Estimates only. Round up and buy a little extra to account for waste, spills, and breakage.
Enter the total vertical rise to calculate the number of steps, the rise per step, and the total run of your staircase.
How to use the stair calculator
- Enter the total rise (floor to floor) in in.
- Enter the target riser height in in.
- Enter the tread depth in in.
- Optionally add a price to estimate the total project cost.
- Read your quantities instantly — no sign-up, and you can print the estimate to take to the supplier.
Worked example
Inputs
- Total rise (floor to floor)
- 108 in
- Target riser height
- 7.5 in
- Tread depth
- 10 in
Results
- Number of steps
- 14
- Riser height
- 7.71 in
- Total run
- 130 in (10.83 ft)
Using the example values above, the stair calculator returns 14 (number of steps). Change any field to match your own project and the numbers update instantly.
Formula
Steps = round(total rise ÷ target riser). Riser = total rise ÷ steps. Run = (steps − 1) × tread depth.
Frequently asked questions
- What is a comfortable stair riser height?
- Most codes cap risers at 7.75 in; 7–7.5 in feels comfortable for most stairs.
- What tread depth should I use?
- Use at least 10 in of tread depth; deeper treads are easier to climb.
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