Stairs Calculators

Calculators for straight stair geometry and spiral stair planning. Estimate risers, treads, stringer length, rotation, walking-line run, and related stair dimensions.

Stair Calculator

Risers, treads, stringer length, stair angle, and Imperial IRC checks for straight stairs.

Spiral Staircase Calculator

Spiral stair steps, riser height, tread angle, walking-line run, diameter, rotation, and handrail length.