Calculator
Stair Rise & Run Calculator
Enter your total rise (floor to floor) and available run to get evenly spaced risers and treads that stay near common code limits.
Common residential limits: riser ≤ 7-3/4", tread ≥ 10". Always confirm against your local building code.
Number of risers
15
Number of treads
14
Riser height
7.200"
Tread depth
8.571"
Stair angle
40.0°
2R + T = 22.97" (comfort range 24–25")
Riser height within typical 4"–7¾" limit
Tread depth below 10" minimum