Stair Calculator
Plan a staircase from the total rise in inches and your tread depth. It targets a comfortable 7.5-inch riser to pick a whole number of steps, then reports the exact riser height and total horizontal run. Always check the result against your local building code.
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Worked example
Steps: 15 · Riser: 7.466667 in · Run: 140 in
Inputs
- Total rise in
112 - Tread depth in
10
Frequently asked
What's a comfortable riser?
Around 7 to 7.75 inches; this tool aims for 7.5 inches per step and rounds to a whole step count.
Why is the run one tread short?
The top step lands on the upper floor, so the run spans one fewer tread than the number of steps.