According to International Residential Code (IRC) standards, maximum stair riser height is 7.75 inches, and minimum tread depth is 10 inches. All risers in a flight must be uniform within 3/8 inch.
Stair Calculator
Calculate rise, run, step count, stringer diagonal length, and IRC building code compliance.
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📊 Calculation Results
LIVE ESTIMATE
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Total Steps / Risers Count
📐 Mathematical Formula & Standard
Total Rise (in) = (Rise Ft × 12) + Rise In
Risers Count = Round(Total Rise in ÷ Target Riser in)
Exact Riser Height = Total Rise in ÷ Risers Count
Treads Count = Risers Count - 1
Risers Count = Round(Total Rise in ÷ Target Riser in)
Exact Riser Height = Total Rise in ÷ Risers Count
Treads Count = Risers Count - 1
📖 Comprehensive Guide & Pro Estimating Tips
❓ Frequently Asked Questions
What is standard step height for residential stairs? ▼
Ideal riser height is 7.0 to 7.5 inches, with a maximum allowable height of 7.75 inches per IRC code.
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