Stairs Calculator
Estimate riser count, actual riser height and total horizontal run.
Formula and assumptions
Planning estimate only. Verify local building codes, landings, headroom, handrails and permitted dimensions.
Results depend on the inputs and assumptions shown. Check units and independently verify important decisions.
For general information. Report an issue.
Frequently asked questions
How is stair riser height calculated?
Divide the total vertical rise by the chosen number of risers. This calculator estimates a layout; actual dimensions must meet local building codes.
How many steps do I need?
The count depends on the total rise and selected riser height. The calculator rounds to a practical whole number and then derives the resulting riser height.
Does this replace building-code requirements?
No. Stair dimensions, landings, headroom, handrails and guards are regulated differently by jurisdiction. Verify the final design with local codes and a qualified professional.