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Stair Calculator
Riser count, tread depth and stringer length for code-friendly stairs.
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Results
Number of Risers
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Riser Height
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Tread Depth
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Stringer Length
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How to use the Stair Calculator
Enter total rise and available run. Risers target ~7 in; treads need 11 in minimum by most codes.
Frequently Asked Questions
Twice the riser plus the tread should equal 24–25 inches for a comfortable stair. Check local code before building.