Stair Calculator
Calculate the number of risers and treads, riser height, total run, stringer length and stair angle with a building-code comfort check.
Formula
risers = ⌈total rise ÷ max riser⌉; riser = rise ÷ risers; treads = risers − 1; comfort: 2R + T ≈ 600–650 mm (24–25.5 in)