Stair Stringer Calculator
Rise and tread assumptions → stringer layout sketch.
Floor-to-floor height.
Number of risers
13
Actual riser height
7.38 in
Number of treads
12
Total run
120.0 in
Stringer length (min.)
153.7 in
Buy stock at least this long — round up for the notch cuts and stock lengths available.
What is this tool?
Stair layout starts from total rise. Dividing by a target riser height gives the number of risers; treads are typically one fewer. Stringer length follows from rise and total run. Common IRC residential ranges are flagged for reference — always confirm local code before building.
How to use it
- Enter total rise and target riser/tread dimensions.
- Read riser count, actual rise, run, and stringer length.
- Verify against local building code before cutting.
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