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Common object sizes: a quick reference
Need a real-world size to compare against? Here's the exact dimensions of everyday objects — credit cards, doors, photos, and more — all in one place.
Everyday objects, exact dimensions
| Object | Size |
|---|---|
| Credit / bank card | 85.60 × 53.98 mm (3.37 × 2.13 in) |
| US business card | 88.9 × 50.8 mm (3.5 × 2 in) |
| EU/UK business card | 85 × 55 mm |
| Standard interior door (US) | 203 × 81 cm (80 × 32 in) |
| Standard interior door (UK) | 198 × 76 cm (78 × 30 in) |
| US passport photo | 51 × 51 mm (2 × 2 in) |
| UK/EU passport photo | 35 × 45 mm |
| Typical smartphone screen | 15.5–17.3 cm diagonal (6.1–6.8 in) |
Some of these are strict international standards (credit cards follow ISO/IEC 7810 exactly, worldwide). Others are common conventions that vary by country or brand — doors and business cards especially. Where there's no single standard, we say so.
Frequently asked questions
How big is a credit card?
85.60 × 53.98 mm (3.37 × 2.13 in) — an exact international standard (ISO/IEC 7810) used worldwide.
What is a standard door size?
In the US, 80 × 32 inches (203 × 81 cm) is most common for interior doors; in the UK it's 78 × 30 inches (198 × 76 cm).
How big is a passport photo?
2 × 2 inches (51 × 51 mm) in the US; 35 × 45 mm in the UK and EU.