How to use it
- Enter total rise and desired riser height using one unit.
- Optionally enter tread depth in the same unit.
- Calculate the rounded riser count and derived dimensions.
Stair Calculator
Estimate basic stair dimensions from total rise and a desired riser height.
Important: This calculator provides material estimates only. It is not structural, safety, legal, or building-code advice. Always confirm with a qualified professional before construction.
About the Stair Calculator
This estimator divides a total rise into an approximate whole number of equal risers and optionally estimates horizontal run.
Estimation formula
Risers equal total rise ÷ desired height rounded upward. Actual riser height divides total rise evenly, and estimated treads equal risers minus one.
Example
A 280 cm rise with a desired 17.5 cm riser gives 16 risers at 17.5 cm and an estimated 15 treads.
Notes
This result does not claim building-code compliance and does not assess structure, landings, headroom, guards, handrails or safety.