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StepCalc

Stair angle and pitch

Degrees, ratio and percentage slope — and whether that pitch is comfortable or even legal.

Units

What the bands mean

Stair pitch, banded. The comfortable band is narrow — about 30° to 37° — and the codes allow a little beyond it.comfortable to hereIRC limit ~42°0°20°30°37°42°50°70°A flight at 34° is the one nobody notices.
Stair pitch, banded. The comfortable band is narrow — about 30° to 37° — and the codes allow a little beyond it.

30–37° is the comfortable range for a stair in daily use. Below 30° a stair starts to eat floor space for little gain; above about 42° it stops being a stair in the eyes of UK Part K, which caps a private stair there.

Pitch is a consequence, not an input. It falls out of the riser and going you chose, which is why the stair calculator is usually the better place to start.