What is Staircase Calculator?

The Staircase Calculator helps you design safe, code-compliant stairs by computing the number of steps, riser height, and tread depth from your total rise and available run. Includes building code guidelines for residential and commercial stairs.

How to use

1. Enter the total floor-to-floor height (total rise) you need to span.
2. Optionally enter the available horizontal run space to constrain the design.
3. View the calculated number of steps, individual riser height, tread depth, and stair angle with code compliance indicators.

Result

Building stairs from ground floor to second floor with a 9-foot (108 inch) total rise — the calculator suggests 15 risers at 7.2 inches each with 10-inch treads, within IRC residential code limits of 7.75-inch max riser.

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