Stair Rise and Run Calculator
Result
Stair Rise and Run Calculator — free online calculator.
Formula
- Stair Rise and Run Calculator calculates its result from Floor-to-Floor Height, Preferred Riser Height, Tread Depth (going), Stair Width. It uses the formula Steps = round(Height/Riser); ActualRiser = Height/Steps; TotalRun = Steps×Tread; Stringer = √(Height²+Run²). Change any input to recalculate the result instantly.
- The main inputs are Floor-to-Floor Height, Preferred Riser Height, Tread Depth, Stair Width. Enter them in the units and format shown in the calculator.
- Keep measurements and project assumptions consistent before comparing or combining values.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Stair Rise and Run
- Floor-to-Floor Height: 2.8
- Preferred Riser Height: 0.175
- Tread Depth: 0.25 going
- Stair Width: 1
At rise 2.8m, preferred riser .175m and tread .25m: 16 steps, 175mm per step, 4m run, 34.99° incline and 4.88m stringer.
Sample result: Calculating…
Frequently asked questions
What does the Stair Rise and Run calculate?
Stair Rise and Run Calculator — free online calculator.
Which values should I enter?
Enter Floor-to-Floor Height, Preferred Riser Height, Tread Depth, Stair Width using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Steps = round(Height/Riser); ActualRiser = Height/Steps; TotalRun = Steps×Tread; Stringer = √(Height²+Run²).
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.