A clean, scrollable ruler with touch markers, a protractor and a bubble level. Calibrate your display for better real-world accuracy.
Drag either endpoint around the circle to measure any angle from 0° to 180°.
An approximate bubble level using the motion sensors in your Android phone. Tap Set zero to define a level reference.
Match the reference line to the short edge of a standard bank card.
Tap to place points A and B, then drag them for a closer fit.
Copy a measurement or download the ruler as a PNG image.
CSS pixels are not guaranteed to match real-world centimeters. For accurate measurement, compare the green bar to the short straight edge of a standard bank card (53.98 mm). Adjust until both ends match exactly.
The preset uses the Galaxy A55's 6.6-inch, 1080 × 2340 screen dimensions. Card calibration is more reliable. Keep browser page zoom at 100%, and recalibrate if your display scaling changes.