Credit Card Size & Dimensions
Universal standard dimensions for payment cards, driver's licenses, and screen calibration references.
Live Screen Ruler Preview
Interactive PreviewPlace your physical payment card against the screen below to verify calibration.
Complete ISO/IEC 7810 ID-1 Technical Specs
The International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC) govern the dimensions of identification cards:
| Property | Metric (ISO Standard) | Imperial | Manufacturing Tolerance |
|---|---|---|---|
| Nominal Width | 85.60 mm | 3.370 in (3 3/8 in) | ±0.12 mm |
| Nominal Height | 53.98 mm | 2.125 in (2 1/8 in) | ±0.05 mm |
| Thickness | 0.76 mm | 0.030 in | ±0.08 mm |
| Corner Radius | 3.18 mm | 0.125 in (1/8 in) | Round corners |
| Aspect Ratio | 1.5858 : 1 | Close to Golden Ratio (1.618) | Fixed |
How to Calibrate Your Screen Ruler with a Bank Card
- Open the Calibration Menu: On Ruler Online, click the Calibrate button in the top toolbar.
- Select Credit Card: Choose the Credit Card calibration mode. A card outline will appear on screen.
- Place Your Card: Hold any physical debit card, driver's license, or transit card directly against the glass of your display.
- Adjust the Slider: Drag the on-screen slider until the boundaries of the on-screen rectangle match the physical edges of your plastic card.
- Confirm & Save: Click Confirm. Your screen's exact Pixels Per Inch (PPI) is calculated and saved to your browser local storage.
Frequently Asked Questions
What are the dimensions of a standard credit card?
Under the international ISO/IEC 7810 ID-1 standard, all credit cards, debit cards, driver licenses, and ID cards measure 85.60 mm wide by 53.98 mm high (3.370 × 2.125 inches) with a thickness of 0.76 mm and corner radius of 3.18 mm.
Why are all credit cards the exact same size?
Standardized ID-1 physical dimensions ensure every payment card fits reliably into automated teller machines (ATMs), point-of-sale chip terminals, magnetic stripe readers, and wallets worldwide.
How do I use a credit card to calibrate an online ruler?
Select Credit Card in the calibration menu on Ruler Online. Hold your physical card against the screen, adjust the on-screen card outline until it matches the physical card edges, and click Confirm to calibrate your screen PPI.
Are hotel keycards and gift cards the same size as credit cards?
Yes. Virtually all modern gift cards, hotel keycards, driver licenses, and transit smart cards follow the same ISO/IEC 7810 ID-1 standard dimensions.