online ruler ppi calibration

Online ruler PPI calibration

Adjust the visual scale to approximate centimeters and inches on screen.

Calibration96 PPI

Reference85.6 mmcommon bank card

Scale20 cm

Calibration stays only in this tab state.

Continue in the tool

Because CSS pixels do not guarantee physical size, reference calibration improves approximation.

Use the result as technical reference and confirm official sources when there is operational impact.

The main tool remains interactive; this page organizes the search intent.

Is it as accurate as a physical ruler?

No. Accuracy depends on calibration, zoom and system scaling.

Why is 96 PPI the default?

Does browser zoom change the ruler?

What reference should I use?

Does it work on phones?

Can the tool detect my monitor?

Is it suitable for technical print work?

Are values saved?

Because CSS pixels do not guarantee physical size, reference calibration improves approximation.

Yes. The main interface runs in the browser and avoids uploading sensitive data when the feature depends on local hardware.