Free Tool
Stair Stringer Calculator
Enter your total rise (floor to floor) — get riser height, tread run, step count, and the stringer length to cut, checked against IRC code.
in
in
Stair Layout
Stringers to cut (2×12)
Steps (risers)
Riser height
Total run
Stocked at our Milwaukie, Portland and Vancouver WA yards — with delivery across Oregon & SW Washington. Pricing is free and there’s no obligation.
Riser height = total rise ÷ number of risers; stringer length = √(rise² + run²). IRC limits: max 7¾" riser, min 10" tread, max ⅜" variation between steps. Always verify against your local building code and have stringers inspected.