The Stairs Calculator tells you how many steps you need, the exact riser height, and total horizontal run for a staircase, based on total rise and your target riser height. Simply fill in the fields above and click Calculate to get an instant result.
This calculator is part of Calculate Wiki’s Construction Calculators collection.
What You’ll Need
- Total Rise — floor-to-floor height
- Target Riser Height — most codes require 7–7.75 in
- Tread Depth — optional, for total run
Formula Used
Number of steps = round(Total rise ÷ Target riser height)
Actual riser height = Total rise ÷ Number of steps
Total run = Number of treads × Tread depth
Example Calculation
Using example inputs — Total Rise = 108 in; Target Riser = 7.5 in; Tread Depth = 10 in — the Stairs Calculator returns:
| Value | Result |
|---|---|
| Number of steps | 14 |
| Actual riser height | 7.71 in |
| Total run | 10.83 ft |
14 steps needed, at an actual riser height of 7.71 in each.
Helpful Information
Results from the Stairs Calculator are estimates based on standard formulas used in the construction calculators field. Staircase dimensions are governed by local building codes — always verify against your local code requirements before construction.