Accurate Angle Measurement with Screen Protractor

Q: How do I measure an angle on my screen?

Download Screen Protractor and drag the transparent hub over what you are measuring. Click and drag the two handles until they match the angle. The readout shows degrees, or you can switch to radians and other units.

Q: How do I move the Screen Protractor?

Click and drag the central hub to move the whole tool. Your pointer turns into a grab hand. Use the rotate buttons or the arrow keys when you want to nudge one degree at a time.

Q: How do I enter an exact angle?

Type the number on your keyboard and press Enter. Type +5 or -5 to add or subtract degrees. You can also multiply and divide the current angle the same way.

Q: Can I change units and the look of the Protractor?

Yes. Open the menu to switch units, change skins, and set transparency. Sticky Angles, Link Angles, and Swap Angles live in that same menu. The getting started page has the full keyboard list.

Q: Is a free online protractor enough for my task?

Browser protractor pages are fine for homework and one-off uploads. When you need to measure over Google Earth, CAD, or a PDF on your desktop, a floating Windows tool fits better. Our blog post When a Free Online Protractor Is Enough walks through when each option makes sense.

The unique Screen Protractor allows you to easily and quickly measure any angle on the screen to the nearest Degree or Radian.

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Full Specs

Our unique transparent Windows app floats above other software, allowing you to measure anything.

Works with any software

Screen Protractor is designed to float above any app, allowing you to measure anything you want

Measure literally anything

The Screen Protractor rotates through 360° allowing you to measure any angle

Purchase with confidence

Download for free, and purchase the full featured version for just $29.50, we offer a risk free 30 day money back guarantee

Fingertip Accuracy and Simple to use

The Screen Protractor's unique design gives it the edge over other apps. By aligning the two guidelines using fingertip controls or nudging pixel by pixel with keyboard shortcuts you can ensure that the measurement you're getting is extremely accurate.

The Protractor can be used with any program as they float over other applications allowing quick and easy measurements. Read the full specs on how everything works.

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Unlock the full version

Find out all the professional features , including custom measurement units and transparency settings that are available after purchasing.

Change Skins

Don't like the look of your Screen Protractor? It's simple to download new skins and change the UX, or even design your own skins.

Log your measurements

If you have a lot to measure then use our free Measurement Logger app to log every measurement you make and export to csv.

Calipers Protractor 4.0 now available, with semi transparent skins, and 360° rotation so you can measure anything on your screen.

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Discover the many uses of your Screen Protractor

Web Designers

Measure pixel perfect HTML layouts in Chrome, Safari, Firefox or Edge

Graphic Designers

Measure photos and illustrations in Adobe Photoshop, Canva or Illustrator

Engineers

Perfect for CAD, measure blueprints, plans and architectural drawings

Microscopy

Connect your microscope and measure magnified tiny things

Medicine

Measure x-rays, scans or EKG, ECG printouts with ease

Education

Teach Mathematics and Physics. See our free classroom lesson plans for Google Earth geometry.

Change the UX with custom skins

The Protractor has a fully 'skinnable' interface. This means that you may download new skins and change the user interface. From aesthetic to technical you should find onscreen solution that suits your needs.

Pictured here the Numeric skin that comes with the program. The Numeric skin has a large semi-transparent base with additional numbers around the edge.