Stairs · Rise and run layout
Divide the rise. Plan the run.
Turn finished-floor height and tread depth into a uniform stair layout, stringer slope, and transparent planning checks.
Total riseTotal runTread depth
Measure finished floor to finished floor for total rise. Tread depth is the horizontal step surface; total run is the horizontal footprint.
1 Set the vertical layout
2 Set the horizontal layout
Results update automatically. Reference warnings are planning aids, not permit or code approval.
Method and limitations
Uniform risers first. Field and code verification always.
The calculator rounds the riser count up from your target maximum, divides the total rise evenly, and derives the run and stringer hypotenuse. It does not design structure or certify compliance.