Photo measurement
Measure angles in an image
Drop a photo here
Or paste one with Ctrl+V. Nothing is uploaded — the image is processed on your device.
Photo measurement
Drop, paste or upload a photo and measure any angle in it. Magnifier for precise placement, perspective correction for off-angle shots, unlimited measurements, and export to PNG, CSV or JSON.
Frequently asked questions
How do you measure an angle in a photo?
Add the photo on this page by dropping, pasting or choosing it, then tap three points: the corner first, then a point along each side. The angle appears straight away, and a magnifier helps you place each point exactly. For two lines that do not meet, choose Angle between lines and tap two points on each line.
A photo taken from off to one side distorts the angles in it. Turn on perspective correction and tap the four corners of something you know is rectangular, such as a door or a sheet of paper, and the angle is measured as if you had shot it straight on. The photo is processed on your device and never uploaded.
Guides
About these measurements
Readings are estimates taken from rendered pixels and consumer device sensors. Do not rely on them for structural engineering, surveying, manufacturing inspection, navigation, or medical decisions. Check anything safety-critical with a calibrated instrument.
All processing happens in your browser. No image, camera frame or sensor reading is ever uploaded.
Other ways to measure
Protractor
Drag to measure, on screen
A precise on-screen protractor. Drag a vertex and two arms for an exact reading, or use the classic rotating protractor face with both scales. Paste a screenshot to measure anything on your screen.
Camera measurement
Sight an angle through your camera
Aim your camera at a roofline, a tree or a slope and read the angle of elevation. Add the distance to work out the height, and hold the reading to note it down.
Inclinometer
Turn your phone into a level
A digital level, inclinometer and plumb gauge using your phone's tilt sensor. Two-position calibration, auto-hold when steady, and readings in degrees, percent grade, roof pitch or rise-and-run.