Stair Stringer Calculator

Worked example

For a 280 cm rise, an 18 cm preferred maximum and a 27 cm tread, the layout uses 16 risers at 17.5 cm each and 15 treads.

Assumptions and limits

Conceptual geometry only. Verify building codes, headroom, landings, handrails, structural support and safe dimensions with a qualified local professional.

Frequently asked questions

Does this calculator design code-compliant stairs?

No. It provides basic geometry from your inputs, not a code or structural design. Confirm all dimensions and safety requirements under local rules before construction.