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Stair calculator
Number of steps, riser height and tread depth for a staircase, checked against comfort rules.
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- Works on any device
About Stair calculator
Enter total rise and run to get the number of steps, riser height and tread depth, checked against comfort rules. A familiar rule is that two risers plus one tread should be about 63 cm. Typical risers are 15 to 19 cm and treads at least 25 cm. Local codes set exact limits.
How to use Stair calculator
- Enter the total rise from floor to floor.
- Enter the available run, or the desired riser height.
- Read the number of steps, riser height and tread depth.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Free to embed on your own website, with a ready-made code to copy.
- Available in 10 languages.
Also known as
Frequently asked questions
What is a comfortable stair riser height?
Between 16 and 18 cm works well for most homes. Higher risers feel steep and tiring, so check your local building code.
What does the comfort check mean?
It compares the riser and tread with common comfort rules. Stairs outside those rules can feel steep or awkward.
Do building codes apply?
Yes, codes set limits for risers, treads and headroom. Check your local code before building.
Is Stair calculator free?
Yes. Stair calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.
Can I put Stair calculator on my own website?
Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.