About PrintProtractor

PrintProtractor makes one thing and makes it correctly: a printable protractor that prints to its true size.

Search for a printable protractor and you will find plenty of images and PDFs. The problem is that most of them print at the wrong size, because the printer quietly scales the page to clear its margin, and the result is a protractor whose angles and ruler are off by a few percent. A few percent is enough to make a measurement useless.

We fixed that by building the geometry in real physical units and adding a calibration bar you can measure after printing. The protractor is drawn in millimetres and PDF points, never in screen pixels, so the size on paper matches the size you asked for. The 100 millimetre calibration bar lets you confirm it in two seconds.

How it works

When you set the size and marks, the tool draws the protractor on your own device and hands you a PDF or SVG. Nothing is uploaded. Each degree is placed with exact trigonometry, the baseline sits on the diameter with the origin at its centre, and the numbers run in both directions so you can read an angle from either side.

The on-screen preview is built from the same geometry as the file, so the preview is an honest picture of what will print. The only variable left is your printer, which is why the calibration bar is there.

Free and private

The tool is free, needs no account, and runs entirely in your browser. We do not see your settings or your files. If you have a question or spot something that looks off, the contact page reaches us directly.