Online Protractor
Measure any angle with a click. No downloads, no ads.
Click center
0°
Click anywhere to place the center point
How to use
Click to place center. Click twice to set two arms. The angle between them is measured.
Angle
0°
Click on the protractor to measure angles. Click center → first point → second point. Works best on desktop with a mouse.
How to use this protractor
- Click to place the center point of the angle.
- Click again to set the first arm.
- Click a third time to set the second arm and see the measured angle.
- Click again to restart and measure a new angle.
Frequently Asked Questions
How accurate is this protractor?
Angles are measured to 0.1° precision. Accuracy depends on your mouse precision and screen size.
Can I measure reflex angles?
Yes. The tool measures the smaller angle between two lines (0° to 180°). The protractor shows 0° to 180° markings.
Is this free?
Always free. Built by Meron Technologies.