Staircase Calculator

Calculate riser count, rise and going dimensions, total run and building regulation compliance from your floor-to-floor height.

Building Regulation Preset

Floor-to-floor height

Preferred riser height

Leave blank to use midpoint of regulation range

Going (tread depth)

Stair width

Enter dimensions

Risers

—

Actual rise

—

Going

—

Total run

—

Pitch angle —

2R + G rule —

Riser height check —

Going check —

Stringer length —

Treads (= risers − 1) —

Domestic riser 150–220 mm

Domestic going 220–300 mm

Public riser 100–180 mm

Public going 250–400 mm

Min stair width 800 mm

2R + G rule 550–700 mm

Max pitch (domestic) 42°

The comfort formula: 2 × Rise + Going should equal 550–700 mm for an ergonomic stair. Values outside this range feel too steep or too shallow.

House stair 175/250 mm

Loft stair 220/220 mm

Office stair 165/275 mm

Public building 150/300 mm