Ruler & Measure - Screen Ruler

Turn your Android phone into a handy ruler.

Ruler & Measure uses your screen to display a real-size ruler for quick length measurements. Whether you need centimeters, millimeters, or inches — just place an object on your screen and read the scale.

SCREEN RULER

Real-size ruler displayed on your phone screen
Horizontal and vertical scales for flexible measurement
Switch between cm, mm, and inch units with one tap
TWO-POINT MEASUREMENT

Tap two points on the screen to measure the distance between them
Results shown in all three units at once (cm, mm, inch)
Copy results to clipboard for easy sharing
DPI CALIBRATION

Automatic screen DPI detection for accurate scaling
Manual calibration slider to fine-tune measurements on your device
Adjust between 80% and 120% for the best accuracy
CUSTOMIZATION

Choose ruler color (dark, light, blue, green) to match any background
Available in English, Korean, and Japanese
GOOD TO KNOW

This is an approximate measurement tool for everyday use
Accuracy depends on your device's screen DPI
Works best for small objects that fit on your screen
No internet required for measurements. Free to use with ads.