Online ruler
Line up a bank card with the outline. The card is ISO/IEC 7810 ID-1, 85.60 by 53.98 mm, and the ruler then shows real centimetres and inches.
- Real size, bank card
- Free, no sign-up
Hold a bank card on the outline. The card is ISO/IEC 7810 ID-1, 85.60 by 53.98 mm. When the edges match, the ruler is real size.
85.60 × 53.98 mm
Centimetres along the topInches along the bottom
Runs in your browser. Nothing you type or open is uploaded. Free to use, no account. More converters
How to use it
- Hold a bank card against the outline.
- Drag the edge or move the slider until the outline matches the card.
- Read centimetres along the top and inches along the bottom.
How the card sets the size
A CSS millimetre is a starting guess. Screens differ, so the ruler becomes real size when the outline matches a card you can measure. The outline is a bank card, ISO/IEC 7810 ID-1, 85.60 by 53.98 mm. Drag the right edge, or move the slider, until the outline and the card share both edges. The slider remembers the match in this browser.
Centimetre ticks run along the top and inch ticks along the bottom, at the same scale as the card. Ten millimetres on the ruler are ten millimetres on the card once the edges match. The match is for this screen and this browser zoom. Change the zoom, or move to another screen, and match the card again.
Private by design
Privacy
Everything runs in this page and stays on your device. The scale stays in this browser.
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Questions
How do I make the ruler real size?
Hold a bank card on the outline and move the slider, or drag the edge, until the outline matches the card. The ruler uses that scale.
Which card works?
A bank card, ISO/IEC 7810 ID-1, 85.60 by 53.98 mm. Credit and debit cards use that size.
Where are centimetres and inches?
Centimetres run along the top. Inches run along the bottom, in the accent colour.
Will the match stay?
The slider is remembered in this browser. A new screen or a new zoom needs the card matched again.