Protractor: Angle Meter

Protractor: Angle Meter turns your phone into an accurate digital protractor, angle finder and inclinometer. Measure any angle on the screen, the slope of a surface with the phone's sensor, or an angle you can only see through the camera. One large, clear protractor scale is used in every mode, and the app works fully offline.

📐 3 WAYS TO MEASURE ANGLES

• Touch Protractor – Place an object on the screen and drag the two arms along its edges. Switch between a 180° and a full 360° protractor, fine-tune each arm in 0.1° steps, lock the arms, type an exact angle, or show the bisector line. A precise on-screen angle meter for paper, drawings, small parts and objects.

• Plumb Protractor (Inclinometer & Slope Meter) – Stand the phone on an edge and a plumb line hangs straight down, like a real plumb-bob protractor. Measure the slope, tilt and inclination of roofs, ramps, stairs, pipes, furniture and machinery. The reading turns green at horizontal (0°) or vertical (90°). Hold freezes the reading and Zero measures the angle between two surfaces.

• Camera Protractor – Line up the protractor baseline with any edge you can see: a roof line, a stair rail, a hillside or a wall. The camera angle finder reads its slope in real time. Freeze the picture, measure any angle in it with two arms, or measure a photo from your gallery.

📊 ANGLE DETAILS: EVERY VALUE, NOT JUST DEGREES

• Degrees, degrees-minutes-seconds (DMS), radians, gradians, NATO mils and turns
• Slope in percent grade, ratio (1:x), roof pitch (x/12) and rise per metre
• Supplementary, complementary, reflex and half angle (bisector)
• Miter saw setting for any corner
• Sine, cosine and tangent
• Tap a reading for the full details and copy them in one tap

🎯 ACCURATE ANGLE MEASUREMENT

• Two-step calibration for each edge of your phone removes sensor and case offsets
• Shows how steady each reading is and whether the edge in use is calibrated
• Smooth, stable readings: hand shake is filtered while real movement is followed
• All units are calculated from one exact value, so they always match
• After calibration, most phones measure to within about ±0.1° to 0.3°

🛠 MADE FOR REAL WORK

• Save measurements with a label and note, and review them in History
• Copy values, share measured pictures and export your history as a CSV file
• Settings for units, decimal places, tolerance, smoothing, measuring edge, magnetic snap, theme, keep screen on, sound and vibration
• Light and dark themes
• Full-screen landscape protractor that never flips while you measure
• Works on phones, foldables and tablets
• Built-in guide with tips for accurate measurements

👷 WHO IS THIS ANGLE METER FOR?

Carpenters, woodworkers, DIY users, builders, roofers, plumbers, electricians, tilers, engineers, architects, students and teachers. Use this protractor app for woodworking and carpentry angles, roof pitch, stair and ramp slope, pipe fall, furniture and fitting work, drafting, school geometry, maths, physics and home projects.

Whether you need a protractor, angle meter, digital protractor, angle finder, inclinometer, slope meter or plumb tool, this app brings them together in one focused utility.

🔒 PRIVATE AND OFFLINE

No account needed. Every measuring tool works offline, and your measurements, photos and sensor readings stay on your phone. The app is free with a small ad, shown only when you are online. Camera access is used only in Camera mode, and photos are opened with Android's photo picker, without access to your library.

Download Protractor: Angle Meter, the free protractor, angle finder and inclinometer for Android, and measure angles quickly and accurately anywhere.

Note: This angle meter is a measuring aid and not a certified instrument. Please verify critical measurements with a professional tool.