Free OnlineCalculators & Converters
Stair Calculator
Calculate stair rise, run, number of steps, stringer length, and angle from total floor-to-floor rise. Checks building code compliance.
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Key Features — Stair Calculator
Step count from total rise
Actual riser height distribution
Total run and stringer length
Stair angle
IRC/IBC code compliance check
Why Use This Tool — Stair Calculator
Free Online Stair calculatorStaircase calculator — for EveryoneFast & Easy Rise and run calculatorHow many steps do i need — 100% FreeFree Online Stringer length calculator
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Use on any device — desktop, tablet, or phone. No downloads or plugins needed.
Frequently Asked Questions — Stair Calculator
What is the ideal riser height?
IRC requires 4–7¾". Comfortable residential riser is 7". Rule: Riser + Tread = 17–18" for comfort.
How do I calculate stair steps?
Total rise ÷ desired riser height → round to nearest whole number → that is your step count. Divide total rise by count for exact riser height.
How long is a stringer?
√(Total Rise² + Total Run²). Add 6–12" for top and bottom cuts.