Stairs Calculator
Worked example result
| Number of risers | 13 |
| Actual riser height | 7.38 in |
| Number of treads | 12 |
| Tread depth (from 2R + T rule) | 10.23 in |
| Total run | 122.8 in |
| Total run | 10.23 ft |
| Stringer length (minimum) | 12.99 ft |
A 96 in floor-to-floor rise divides into 13 risers of 7.38 in. That gives 12 treads; the 2R + T = 25 rule sets the tread depth at 10.23 in, a total run of 122.8 in (10.23 ft) and a minimum stringer length of about 13 ft.
Risers = round(Total rise ÷ target riser); Actual riser = Total rise ÷ risers; Treads = Risers − 1; Tread = 25 − 2 × riser; Run = Treads × tread; Stringer = √(Rise² + Run²) · Powered by CalcHub — Stairs Calculator