Stair Calculator

Lay out a stair from the total rise: riser height, number of risers and treads, total run, and stringer length, with a comfort-rule check.

Stairs

Total Rise (in)

Finished floor to finished floor

Target Riser (in)

~7"

Tread Depth (in)

≥10"

Governing Code

Layout

Riser Height7.2 in

Risers / Treads15 / 14

Total Run147 in

Stringer Length182.41 in

✗ Riser ≤ 7"✗ Tread ≥ 11"

✓ Also meets the 2R + T ≈ 24–25" comfort rule

IBC 1011.5 (commercial). Also check max flight height, landings, nosing & handrails.

Run your whole job on the same numbers

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