Stair Calculator
Calculate stair count, total rise and total run from floor height and riser/tread.
Calculator
Result
About this calculator
Calculate stair count, total rise and total run from floor height and riser/tread. 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); Target riser height (mm); Tread depth (mm). Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The design result calculates a stair dimension or converts a measurement using the values and units entered. Check finished floor-to-floor height, the number of risers and treads, consistent units, and applicable local building requirements.
When to use it
Use this for preliminary layout and dimension checking. Verify stair geometry, headroom, handrails, and code compliance with a qualified designer or building professional before construction.