Standard trading cards are 2.5 × 3.5 inches (63.5 × 88.9 mm). This applies to Pokemon, MTG, Yu-Gi-Oh!, One Piece, and most other TCGs.
| Game | Size (inches) | Size (mm) | Notes |
|---|---|---|---|
| Pokemon | 2.5 × 3.5 | 63.5 × 88.9 | Standard size, all sets |
| Magic: The Gathering | 2.5 × 3.5 | 63.5 × 88.9 | Standard size |
| Yu-Gi-Oh! | 2.35 × 3.38 | 59.0 × 86.0 | Slightly smaller ("small" size) |
| One Piece | 2.5 × 3.5 | 63.5 × 88.9 | Standard Bandai size |
| Disney Lorcana | 2.5 × 3.5 | 63.5 × 88.9 | Standard size |
| Digimon | 2.5 × 3.5 | 63.5 × 88.9 | Standard Bandai size |
| Star Wars Unlimited | 2.5 × 3.5 | 63.5 × 88.9 | Standard FFG size |
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Most trading cards (Pokemon, MTG, One Piece, Lorcana) are 2.5 × 3.5 inches (63.5 × 88.9 mm). Yu-Gi-Oh! cards are slightly smaller.