TOOL
Stair Calculator
Stair dimension calculation and code compliance check
Floor-to-Floor Height
mm
Riser Height
mm
Tread Depth
mm
Code Reference
General stair: riser ≤ 200mm, tread ≥ 240mm (Korea)
Evacuation stair: riser ≤ 180mm, tread ≥ 260mm (Korea)
Residential: riser ≤ 180mm, tread ≥ 260mm (Korea)
Optimal formula: 2R + T = 600~650mm (Blondel's formula)