Online Ruler - Free Virtual Ruler
Precise measurements in centimeters and inches. Automatic screen calibration for maximum accuracy.
100%
Click and drag to measure distance
Accuracy: ±0.1cm •
Status: Needs calibration
Calibration:
Not calibrated
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How to Use the Virtual Ruler
- 1 First, calibrate your screen for accurate measurements
- 2 Select your preferred units (cm or inches)
- 3 Click and drag across objects to measure them
- 4 Use zoom controls for precision measurements
Calibration Methods
- Automatic: We detect your screen size automatically
- Credit Card: Use a standard credit card (85.6mm × 53.98mm)
-
Manual: Enter your screen diagonal size
📱 Check device specs online (e.g., "iPhone 13: 6.1 inches")