Protractor: Angle Measure

Global Utility App Maker

Contains ads

About this app

Protractor is the most accurate digital protractor, angle ruler, and angle finder for Android. Measure any angle from 0 to 360° using your phone's gyroscope and screen — no analog tool needed.

Whether you're a student doing geometry homework, a craftsman setting miter cuts, or a designer measuring drawings, Protractor turns your phone into a precision angle measurement tool.

▶ MAIN FEATURES
• Protractor — measure angles between two screen points
• Angle ruler — touch two points to read the angle
• Gyroscope mode — measure physical angle by rotating the phone
• Plumb mode — vertical reference angle
• Pitch & roll mode — independent X/Y axis angles
• 0.1° precision via accelerometer + gyroscope sensor fusion
• Hold mode locks the value hands-free
• Switch units: degrees, radians, gradians
• Dark mode for indoor use
• Works fully offline — no account, no ads block

▶ HOW TO USE
1. Open Protractor and choose mode: screen touch or gyroscope
2. For screen mode: tap two points on the half-circle scale
3. For gyroscope mode: rotate the phone to measure
4. Read the angle in degrees, radians, or gradians

▶ WHO USES PROTRACTOR
• Students learning geometry and trigonometry
• Math teachers demonstrating angles in class
• Carpenters setting miter and bevel cuts
• Tile installers checking corner angles
• Roof installers calculating pitch
• Architects and designers measuring drawings
• Sewing pattern makers angling darts
• Quilters cutting precise triangle angles
• Engineers verifying mechanical part angles
• Hobbyists building model planes and trains