Short answer: a standard trading card weighs about 1.7 to 1.8 grams (PokemonDB: how much do Pokémon cards weigh (1.7 to 1.8 g)). One card in a penny sleeve and a toploader, in a #10 envelope, is about 15 g, roughly half an ounce: a one-stamp letter, plus the nonmachinable surcharge because the toploader makes it rigid. Add up your own envelope with the weight calculator.
Typical weights
| Item | Grams | Ounces |
|---|---|---|
| Standard card | 1.8 | 0.06 |
| Penny sleeve | 0.6 | 0.02 |
| Toploader | 7.3 | 0.26 |
| #10 envelope | 5 | 0.18 |
Sources: PokemonDB: how much do Pokémon cards weigh (1.7 to 1.8 g); Faire: 100 penny sleeves listed at 58.97 g; BCW: 100 toploaders + 100 sleeves listed at 1.74 lb; Business Source #10 envelopes, 100 listed at 1.16 lb. Brands differ by a few tenths of a gram, so weigh a finished envelope on a kitchen scale before you buy stamps for a batch.
When it stops being a letter
A USPS letter can weigh up to 3.5 oz and be up to 1/4 inch thick (USPS Notice 123 (price list)). By weight that is around 40 sleeved cards in a #10 envelope, but a stack of cards gets thick long before it gets heavy, and a lumpy envelope is nonmachinable. Past either limit it mails as a flat or a package.
Why it matters for TCGplayer orders
TCGplayer's shipping export has a Product Weight column, but your postage depends on the finished envelope: card, sleeve, toploader, envelope and packing slip. Under-stamped letters come back or arrive postage-due, which turns into a refund. Weigh once, write the number on your packing station, and stamp every similar order the same way.
FAQ
How much does a Pokémon card weigh?
About 1.7 to 1.8 grams; some holofoils are a little heavier (PokemonDB: how much do Pokémon cards weigh (1.7 to 1.8 g)).
How much does a card in a toploader weigh?
About 9.7 g for the card, a penny sleeve and a toploader; about 15 g in a #10 envelope with a packing slip.
How many cards fit in a letter?
By weight roughly 40 sleeved cards under the 3.5 oz limit, but the 1/4 inch thickness limit usually comes first (USPS Notice 123 (price list)).
Sources
- PokemonDB: how much do Pokémon cards weigh (1.7 to 1.8 g) (checked October 24, 2026)
- Faire: 100 penny sleeves listed at 58.97 g (checked October 24, 2026)
- BCW: 100 toploaders + 100 sleeves listed at 1.74 lb (checked October 24, 2026)
- Business Source #10 envelopes, 100 listed at 1.16 lb (checked October 24, 2026)
- USPS Notice 123 (price list) (checked October 24, 2026)