Screen Ruler
Screen Ruler.
An accurate on-screen ruler for your display. Calibrate by entering your screen specifications for precise real-world measurements.
Calibration
Enter your screen specifications for accurate measurements.
Ruler unit
Not calibrated
Use calibration for accurate real-world measurements
About
Screen calibration
Enter your monitor's diagonal size (e.g., 27") and its native resolution (e.g., 2560×1440). From these two values, we calculate your exact PPI — pixels per physical inch — so the ruler matches the real world.