Stair stringer calculator
Riser height, step count, total run and stringer length from the total rise, checked against common code limits.
Stair layout
Riser height
7 11/16"
14 risers, 7.714"
Total run
10' 10"
13 treads at 10"
Stringer length
14' 8 13/16"
Buy 16' stock · 37.6°
- Riser height 7.71" (code max 7.75")
- Tread depth 10" (code min 10")
- Comfort (2 × rise + run) 25.43" (aim for 24" to 25.5")
- Stringer throat 5.14" left (keep at least 3.5")
- Angle 37.6° (steeper than 42° feels like a ladder)
Set a framing square's stair gauges at 7 11/16" and 10". Cut 1" off the bottom so the first step matches. Code limits are the common US residential ones; check your local code.
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