Online Ruler

Place an object against the screen to measure it. For accurate results, calibrate with a bank card first.

Runs in your browser — nothing is uploaded

How to use Online Ruler

  1. Hold a bank card (85.6 mm wide) against the screen and drag the slider until the outline matches.
  2. Measure your object along the cm or inch scale.
  3. The calibration is saved in this browser.