Virtual Protractor - Online Angle Measurement
Precise semicircular angle measurement tool. Perfect for students, teachers, and professionals. Click two points to measure angles from the center with 0.1° accuracy. Drag points to adjust measurements.
Current Angle
Click 2 points
Points: None selected
Configuration
Size:
400px
Opacity:
80%
Rotation:
0°
Precision
±0.1°
Professional accuracy
How to Use the Protractor
1
Two-Point Measurement
- • Center (V) is automatically set
- • Click first measurement point
- • Click second measurement point
- • Drag points to adjust angle
2
Background Images
- • Upload or drag & drop images
- • Adjust opacity and scale
- • Position perfectly for measurements
- • Perfect for technical drawings
3
Advanced Features
- • Semicircular protractor (0-180°)
- • Fullscreen measurement
- • Rotation and size adjustment
- • 0.1° precision accuracy
Angle Types
Acute Angles
- Less than 90° (e.g., 30°, 45°, 60°)
Right Angles
- Exactly 90°
Obtuse Angles
- Between 90° and 180° (e.g., 120°)
Reflex Angles
- Greater than 180° (use 360° mode)
Pro Tips
Click precisely on the vertex for most accurate measurements
Adjust image opacity to clearly see both image and protractor
Use fullscreen mode for large technical drawings