Printable Protractor
Full-circle and half-circle protractors marked every single degree and labelled every 10°, at an exact 10 cm, 15 cm or custom diameter — print at 100% or download a 150 DPI PNG.
Print-at-100% note
Set your print scale to 100% (turn off “fit to page” / “shrink to fit”) and print on A4 · 210 × 297 mm in portrait. The protractor is drawn at exactly 150 mm across, so any other scale makes the degree markings useless. Check the 100 mm line printed at the top of the sheet with a ruler after your first print.
0° sits on the left of the baseline and the scale runs anticlockwise, like a school protractor.
Protractor
Markings
In radians the labels are π fractions: π/6 at 30°, π/4 at 45°, π/2 at 90°, π at 180°.
Paper
A4 landscape is 297 × 210 mm — the best fit for a 15 cm full circle.
About this tool
The protractor is drawn with true trigonometry: a tick for every single degree (longer at 5° and 10°), labels at each 10° or at π fractions, a centre crosshair, a baseline through the diameter and an inner complementary scale so you can read from either side. Because the diameter is set in millimetres and the sheet is rasterised at 150 DPI on A4 (210 × 297 mm) or US Letter (8.5 × 11 in), a 15 cm protractor prints exactly 150 mm wide at 100% scale. Everything is generated in your browser.
- 100% free — no account needed
- Runs in your browser
- Nothing is uploaded
Frequently asked questions
Is Printable Protractor really free?
Yes. Printable Protractor is completely free on PureBrowser — every feature, with no account, no trial, and no credit card.
Does Printable Protractor upload my data?
No. Printable Protractor runs entirely inside your browser, so anything you type, paste, or open stays on your own device.
Do I need to sign up or install anything?
Neither. There is no account and nothing to download — open the page and Printable Protractor is ready to use on desktop or mobile.
Does Printable Protractor work offline?
Once the page has loaded, yes. All of the processing happens locally in your browser, so it keeps working without a connection.
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