🪜 Staircase Calculator
Calculate staircase dimensions: number of steps, riser height, tread depth, and stringer length.
About Staircase Calculator
Design safe and comfortable staircases with our calculator. Enter total rise, desired riser height, and tread depth to calculate number of steps, total run, stringer length, and headroom clearance.
Features
- Riser and tread calculation
- Stringer length
- Building code compliance
Frequently Asked Questions
What is standard stair riser height?
Standard riser height is 7-7.5 inches (178-190mm). Building codes typically allow 4-8 inches. Tread depth should be minimum 10 inches (254mm) for comfortable use.
How to calculate number of stairs?
Divide total rise by desired riser height, round to nearest whole number, then divide total rise by number of risers for actual riser height. Our calculator does this instantly.
What is the stair angle formula?
Stair angle = arctan(rise/run). Comfortable stair angles range from 30-38 degrees. The 2R+T formula (2 x riser + tread = 24-25 inches) ensures comfortable step proportions.