Stair Riser Calculator
Calculate actual riser height from floor height and number of risers.
Calculator
Result
About this calculator
Calculate actual riser height from floor height and number of risers. Use the result as a planning estimate. Actual architectural, construction, lighting and building requirements can vary by project conditions, materials, local codes and professional specifications.
How to use this calculator
What to enter
Enter or select the following as requested: Total floor height (mm); Number of risers. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The design or building result is calculated from the dimensions, scale, slope, spacing, or lighting assumptions entered. Check measurement units, rounding, clearances, local building requirements, and whether the dimensions represent finished or structural measurements.
When to use it
Use this for early layout, space, stair, roof, or lighting estimates. Verify measurements on site and consult applicable codes or a qualified designer/engineer before construction or safety-critical work.