Steps (risers)
15 risers
15 risers of 7.2 in, 14 treads of 10.5 in
| Riser height | 7.2 in |
| Treads | 14 treads |
| Total run | 147 in (12 ft 3 in) |
| Stringer length | 182.4 in (15 ft 2.4 in) |
| Stair angle | 34.4 ° |
| IRC check (7¾ in riser, 10 in tread) | Meets |
Stringer length is measured along the line of the nosings; allow extra board length for the top and bottom cuts. Check headroom, width and handrails with your local building department.