Stair stringer calculator
Split a stair’s height into even risers and see the treads, the stringer length and where to mark it, checked against your country’s stair rules.
What to buy
Stringers–
- Treads–
- Riser boards–
Risers
–
Treads
–
Total run
–
Stringer length
–
Marks along the edge
Construction calculators
How to use it
- Type the heights
The total rise from floor to floor, the tallest riser you want and the tread depth.
- Read the stair
Risers, treads, the run and the stringer length follow, checked against the stair rules you pick.
- Mark the stringer
Set a framing square to the riser and the tread, and mark the board at each distance shown.
Tips
- Finished floors
Measure the rise from finished floor to finished floor, so the first and last steps match the rest.
- Drop the stringer
Cut the foot of the stringer down by one tread’s thickness, or the first step comes out taller.
- One tread fewer
The upper floor is the last step, so a stair has one tread fewer than it has risers.
In the app
Construction tools in Clinometer
- A drawing of each job, with the sizes on it
- Stairs checked against the stair rules as you type
- A feet-inch-fraction job calculator with a Stair key
- Shopping lists to tick off or send to To-do
