The Card & Sleeve Size Index
Card size is not universal, and the sleeve classes are not interchangeable. Pokémon cards are 63.5 × 88 mm and Magic cards 63 × 88 mm, both taking standard sleeves around 66 × 91 mm. Yu-Gi-Oh! cards are 59 × 86 mm and need Japanese-size sleeves around 62 × 89 mm. A Yu-Gi-Oh! card will slide into a standard sleeve, but it sits loose and shifts.
The dataset
| Game / format | Card width | Card height | Inches | Sleeve class | Sleeve size | Note | Source | Source class |
|---|---|---|---|---|---|---|---|---|
| Pokemon TCG | 63.5 mm | 88 mm | 2.5 x 3.5 in | Standard | ~66 x 91 mm | Shares the standard sleeve class with Magic: The Gathering. | Published card standard + sleeve vendor specs | manufacturer spec |
| Magic: The Gathering | 63 mm | 88 mm | 2.5 x 3.5 in | Standard | ~66 x 91 mm | The reference size the standard sleeve class is built around. | Published card standard + sleeve vendor specs | manufacturer spec |
| Yu-Gi-Oh! | 59 mm | 86 mm | 2.32 x 3.39 in | Japanese / small | ~62 x 89 mm | About 4.5 mm narrower and 2 mm shorter than a standard card; fits a standard sleeve but sits loose. | Published card standard + sleeve vendor specs | manufacturer spec |
| Sports cards (modern base) | 63.5 mm | 88 mm | 2.5 x 3.5 in | Standard | ~66 x 91 mm | Same footprint as Pokemon; thickness varies far more than size. | Industry standard card size | standard reference |
| Inner / perfect-fit sleeve | n/a | n/a | n/a | Perfect fit / inner | ~64 x 89 mm | Sized to hug a standard card with no margin; the inner layer when double-sleeving. | Sleeve vendor specs | manufacturer spec |
Download
card-sleeve-size-index.csv (latest) · card-sleeve-size-index-v1.0.csv (version-pinned, stable for citation)
License: CC BY 4.0 — free to use with attribution, including for commercial and machine-learning use.
How to cite
Sleeve Lab, “The Card & Sleeve Size Index”, version 1.0, 2026. Available at https://sleeve-lab.pages.dev/card-sleeve-size-index/ under CC BY 4.0.
Methodology & versioning
- Dimensions are published card standards stated in millimetres, with the inch equivalent given for reference.
- Sleeve sizes are approximate by nature - vendors vary by a millimetre or so within a class, which is why they are shown with a tilde rather than false precision.
- Fit is not the same as correct fit. A smaller card physically enters a larger sleeve; the table records the class each card is actually sold for.
- We have not measured cards ourselves. Figures are published standards and vendor specifications.
- Versioning. v1.0 published July 30, 2026. The version-pinned CSV will not change; corrections ship as a new version with a dated note.
This is a supplies-specification reference, not investment, authenticity or grading advice. Verify current submission requirements directly with the grading company before shipping cards.