Stair Calculator
Calculate stair dimensions and check building code compliance.
Stair Calculator
Calculate stair dimensions and building code compliance
Formula
Risers = Total Rise ÷ Ideal Riser Height (7.5 in)Checks IRC building code requirements
How to Use This Calculator
- 1
Measure total rise
Measure the total vertical distance from floor to floor.
- 2
Measure available run
Measure the horizontal space available for the stairs.
- 3
Check code compliance
Review the results to ensure they meet building codes.
Frequently Asked Questions
What is the ideal riser height?
Building codes typically require 7-7.75 inches. 7.5 inches is considered ideal for comfort.
What is the minimum tread depth?
IRC building code requires a minimum 10-inch tread depth for residential stairs.
What is the 2R + T rule?
The sum of twice the riser height plus tread depth should equal 24-25 inches for comfortable stairs.