About this calculator
Estimate riser count, actual rise and approximate horizontal run.
Stairs are safety-critical. Always check local building regulations and site dimensions.
Formula
Risers ≈ total rise ÷ target riser, rounded to a whole number. Actual riser = total rise ÷ risers.
Example
2700mm total rise at roughly 180mm gives about 15 risers.
Accuracy
NUMTX shows the assumptions next to the calculation so you can replace defaults with values that match your situation. For measurements, supplier rates, fees, interest, tax or regulated work, confirm important figures with the appropriate official or professional source.