A stair calculator determines the optimal number of steps, riser height, and tread depth for a given floor-to-floor height. Building codes specify maximum riser height (7.75" in the US) and minimum tread depth (10") to ensure safe, comfortable stairs.
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Pro Tip
Consistency is crucial — all risers must be within 3/8" of each other per building code. An uneven step is a major trip hazard.
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Did You Know?
The Blondel formula (2R + T = 24–25") was developed by French architect François Blondel in 1672 and remains the gold standard for comfortable stair design — 350 years later.
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