Stair Stringer Calculator
Risers, goings, and stringer length for a total rise.
Risers
15
Each riser
180 mm
Stringer
4.62 m
Worked example
A total rise of 2,700 mm with a target riser of 175 mm gives 15 risers of 180 mm. At a 250 mm going, the stringer is about 4.62 m.
FAQ
- How is the number of risers chosen?
- Total rise divided by the target riser, rounded to the nearest whole number, and at least one.
- What is the going?
- The horizontal depth of one tread. The stringer length is the hypotenuse of riser and going, times the number of risers.
- Does this meet the building code?
- No. Riser and going limits differ by place. Check the numbers against the code that applies to the stair.