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Online ruler
A real-size ruler on your screen in centimetres and inches, after a quick calibration.
- Free
- No sign-up
- Works on any device
About Online ruler
A ruler drawn at true size in centimetres and inches. Screens vary in pixel density, so you first calibrate by holding a bank card against the screen, which is a standard 85.6 by 53.98 mm, and the ruler then matches real measurements.
How to use Online ruler
- Do the quick calibration by matching the on-screen mark to a card or known object.
- Choose centimetres or inches.
- Hold the object against the screen and read its length from the ruler.
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
Is the on-screen ruler accurate?
It is accurate after calibration with an object of known size, such as a bank card. Without calibration the browser can only guess the pixel size, so small errors are likely.
What can I use to calibrate the ruler?
A bank card is a handy reference because its size is standardised. Match the on-screen card shape to your real card, and the ruler scales to your screen.
Do I need to recalibrate on another device?
Yes. Every screen has a different pixel density, so calibrate again on each device. If you change the browser zoom, calibrate again too, or the sizes will be off.
Is Online ruler free?
Yes. Online ruler 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 Online ruler 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.