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Stair Calculator

Calculate stair dimensions with IRC code compliance checks. Get material estimates for stringers and treads.

Floor-to-floor height · 108" = 9' floor
Stair Layout
14 risers × 13 treads
Step Dimensions
Actual Rise per Step7.71"
Actual Run per Step10.00"
Total Run130.0" (10.8 ft)
Stringer Length169.0" (14.1 ft)
IRC R311.7 Code Compliance
Rise: 7.71" (4"–7.75")
Run: 10.00" (10" min)
Comfort: 17.71" (17"–18")
iHeadroom: verify 6'8" minimum clearance on site
Materials
Stringers (cut)4 × 16' 2×12
Tread Material39.0 board feet
Riser Material31.5 board feet

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