Stair Riser Height Calculator
Riser height = total rise ÷ number of risers
Calculate equal riser height from a total rise and riser count.
Formula
Riser height = total rise ÷ number of risers
Worked example
Total rise: 2800 mm
Number of risers: 16
With these inputs, the result is 175 mm.
How to use this calculator
- Identify the quantity you want to calculate.
- Enter your measurements in the units shown on each field.
- Read the result, which updates as you change the inputs.
- Check the assumptions below before applying the result.
Assumptions and limits
This arithmetic does not establish compliance with local stair design rules or safe tread dimensions.
Precision and checking
Results are rounded for display. Use the most accurate measurements available, and avoid rounding your inputs unnecessarily. Extra decimal places in a result do not make an estimate more reliable.
To check a result, substitute the same input values into the formula shown above. Change one value at a time to understand how the quantity responds.
Frequently asked questions
What assumptions does this calculation use?
This arithmetic does not establish compliance with local stair design rules or safe tread dimensions.
Are my inputs sent to a server?
No. The calculation runs locally in your browser. The result updates as you edit the inputs.
