Stair Calculator
Free online stair calculator for perfect stairs
About Stair Calculator
Stair Calculator is a free online stair calculator built for homeowners, contractors and DIY builders who want safe, comfortable, code-conscious stairs. Enter your total rise and run to get the number of risers and treads, individual riser height, tread depth, stringer length, stair angle and total run — all calculated instantly in your browser. The tool helps you balance riser and tread proportions, estimate stringer board length, and plan stair layouts for straight staircases with confidence. No sign-up, no downloads and no fees: just enter your measurements and get clear, printable-style results you can take to the workshop or job site.
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