Quick answer: For a qualifying 1-ounce letter or postcard sent from the United States to Canada, use one Global Forever stamp. Its current postage value is $1.75. Two ordinary domestic Forever stamps total $1.64 and are short; three total $2.46 and would overpay.
This answer uses USPS prices effective July 12, 2026 and checked August 25, 2026. It applies only when the mailpiece meets First-Class Mail International letter or postcard standards.
Domestic Forever stamps versus Global Forever
| Option | Current total | For a qualifying 1 oz letter to Canada |
|---|---|---|
| 1 Global Forever stamp | $1.75 | Covers the rate |
| 2 ordinary Forever stamps | $1.64 | 11 cents short |
| 3 ordinary Forever stamps | $2.46 | Covers the rate but overpays |
You may combine valid U.S. postage to reach the required amount. A Global Forever stamp is simply the most direct option for the basic one-ounce international letter or postcard rate.
When one Global Forever stamp is not enough
- The letter weighs more than one ounce.
- The piece exceeds letter dimensions or is unusually thick.
- The envelope is rigid, square, or otherwise nonmachinable.
- The contents require a customs form or a different mail service.
Documents and merchandise can follow different international rules. Confirm the mail class, destination, dimensions, and contents with the USPS international mailing steps before applying postage.
Related guides
Read our broader guide to Forever stamps for international mail, or return to the Forever stamps FAQ.
Source checked: USPS First-Class Mail International. Rates and requirements can change; verify before mailing.