RealRuler - The most accurate online ruler (cm/inch)

Calibration
To work correctly RulerRuler might need to calibrate first. Method 1: Drag the range selector to calibrate the RealRuler against the physical ruler.
0
50
Method 2: Enter the correct value of your display diagonal in pixels.
Diagonal (inch):

Click the button to save your settings permanently.

<< >>