Stair calculator
Count the steps, the total run, and the stringer from the rise you type.
Result
Stair calculator
- Units (required)
- Feet and inches
Steps
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Enter the total rise, the target rise, and the tread.
Ballpark estimate, check before you buy or quote.
1 inch = 25.4 millimetres exactly (international yard and pound agreement, 1 July 1959). Verify with your local code or a professional.
Estimate for planning only. This is not tax, legal, accounting or financial advice. Results depend on the figures you enter. Check all numbers, rates and rules with the official source or a qualified professional before relying on them.
How this works and common questions
About this tool
The step count rounds up so no rise is taller than the target you type. Treads are one fewer than the rises. The stringer is the straight length of the total rise and the total run.
How it works
Divide the total rise by the target rise and round up. That is the number of rises. Treads are one fewer, and the total run is the tread times that count. The stringer is the straight length of the total rise and the total run, rounded up to the next whole inch or millimetre.
Rules
You choose feet or metres. Verify with your local code or a professional. Ballpark estimate, check before you buy or quote.
Questions
How many steps do I get?
The total rise divided by the target rise, rounded up. 108 inches with a 7 inch target is 16 rises.
How long is the total run?
One fewer tread than the number of rises, times the tread you type. 16 rises and a 10 inch tread run 150 inches.
How long is the stringer?
The straight length of the total rise and the total run, rounded up to the next whole inch or millimetre. This example is 185 inches.
Do I need an account?
No. The tools work without one. You only need to sign in to save your work.
Is what I type saved?
No. Nothing is saved unless you sign in and choose Save. Otherwise it stays on the page.
Do you show ads or sell my information?
No. We show no ads and we do not sell your information.
Is this tax or legal advice?
No. Results are estimates for planning. Check rates and rules with the official source or a qualified professional.
Sign in to save this. Your entries stay on screen.
Estimate for planning only. This is not tax, legal, accounting or financial advice. Results depend on the figures you enter. Check all numbers, rates and rules with the official source or a qualified professional before relying on them.