Stair Calculator
Plan stair rise, run, and tread depth with code-friendly guidance
IRC guidance: riser 4–7¾″, tread ≥ 10″, 2R + T between 24 and 25″.
risers = ⌈rise / preferred⌉ · run = (risers − 1) × tread
Risers
16
Riser height
6.75″
Total run
165.0″
Angle
33.2°
Riser PASS (4–7¾″)Tread PASS (≥ 10″)2R+T OK (24.5″)