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Whiz Tools

Stair Stringer Calculator - Calculate Rise, Run & Cuts | IRC Compliant

Calculate exact stair stringer dimensions for code-compliant stairs. Get step count, rise/run, lumber size, and cut patterns. Supports US IRC, IBC, Canadian, and international building codes. Free tool for carpenters and DIYers.

Stair Stringer Calculator

Building Codes & Safety Requirements

US/Canada Building Codes

  • • Maximum riser height: 7.75 inches
  • • Minimum tread depth: 10 inches
  • • Maximum variation: 3/8 inch
  • • Minimum headroom: 6'8"

International Standards

  • • Maximum riser height: 7.5 inches
  • • Minimum tread depth: 9.5 inches
  • • 2R + T = 24-25 inches rule
  • • Consistent rise and run throughout
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Documentation

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