Camera MeasureBeta

Measure your blur distance with your front camera — no account needed

Keep both eyes open. Move your device toward your face until the text below just starts to blur, then hold still.

The quick brown fox jumps over the lazy dog. Move your device until this line is just beginning to blur, then hold still.

Everything runs on your device. The video never leaves your browser, and nothing is uploaded or recorded.

Calibrate once for accuracy
Your camera can measure the gap between your pupils in pixels, but turning that into centimeters needs two things your browser won't reveal: your exact pupil spacing and your camera's focal length. Measuring once at a known distance pins down both at the same time — after that, this device never needs a tape measure again.
  1. Start the camera and hold your device at a distance you measure with a tape.
  2. Hold still until the reading says “holding steady”.
  3. Type that measured distance below and save.

Start the camera to calibrate.

Is this as good as a tape measure?

Once calibrated, close. The camera measures your pupil gap to a fraction of a percent, which is far finer than the 0.25 D steps people track. The bigger risk is your head turning — that shortens the apparent gap and reads falsely close — so readings are only taken while you're square to the lens.