Mailing a postcard is a simple, tangible way to connect with friends and family, but figuring out the exact postage required can sometimes feel confusing. Whether you're sending vacation memories or running a direct-mail campaign, knowing the correct price prevents delays and returned mail.
In the United States, sending a standard-sized rectangular postcard requires a specific postcard stamp, which costs $0.65. If you're mailing from Canada, domestic postcard rates follow standard Lettermail pricing, where a single stamp costs $1.44 or $1.24 when purchased in a booklet or coil. Understanding these rates helps you budget accurately and choose the right class of service for your correspondence.
Understanding Postcard Dimensions and Weight Limits
Not every piece of cardstock qualifies for postcard rates. Postal services enforce strict rules regarding size and thickness to ensure items can run smoothly through high-speed sorting machines.
A standard postcard must be rectangular. For USPS mailers, the minimum dimensions are 3.5 inches high by 5 inches long, and the maximum dimensions are 4.25 inches high by 6 inches long. Thickness must be at least 0.007 inches and no more than 0.016 inches.
If your postcard exceeds these maximum dimensions—even slightly—it doesn't qualify for the lower postcard rate. Instead, it gets classified as a letter or flat envelope, requiring standard first-class postage. Always measure your cards before affixing stamps to avoid surprise surcharges or returned items.
Domestic Versus International Postcard Postage
Where your postcard travels dictates the price you pay. Domestic rates apply when sending mail within the borders of the country where you mail it.
International postcard rates apply to any destination outside your home country. For USPS senders, First-Class Mail International covers postcards sent to any foreign country for a flat rate of $1.75. Canada Post charges international letter-post rates for cards sent abroad.
Always verify destination-specific rules if you're sending mail overseas. Some countries have unique size restrictions or customs declarations for printed paper items, though standard personal postcards rarely trigger extra requirements.
Why Postal Rates Change and How to Plan Ahead
Postal authorities adjust their pricing periodically to combat inflation, rising transportation expenses, and shifting mail volumes. These adjustments help maintain reliable delivery networks across urban and rural regions alike.
Because rates tend to rise incrementally year over year, buying non-denominated stamps—such as Forever stamps in the U.S. or Permanent stamps in Canada—protects you from future price hikes. Once you purchase a Forever stamp, it remains valid for a standard postcard or letter regardless of future rate increases.
Common Mistakes When Mailing Postcards
Mailing postcards seems foolproof, but a few frequent errors cause delivery failures or extra expenses.
- Using letter stamps on oversized cards: If your card is larger than standard dimensions, a postcard stamp won't cover the required postage.
- Ignoring thickness rules: Adding thick embellishments, ribbons, or wax seals turns a flat postcard into a non-machinable item, incurring extra fees.
- Failing to check current rates: Using old, leftover stamps without verifying the current face value leaves your mail underpaid.
Frequently Asked Questions
Can I use a regular letter stamp on a postcard?
Yes, you can always use a standard first-class letter stamp on a postcard. You'll pay a bit more than necessary, but your mail will deliver without issue.
Do handmade or photo postcards cost more?
If your handmade postcard stays within standard dimensions and thickness limits, it qualifies for postcard rates. However, stiff or lumpy cards require non-machinable surcharges.
What happens if my postcard has insufficient postage?
The postal service will either return the postcard to your return address for extra postage or deliver it to the recipient with postage due, depending on local postal regulations.
Are Forever stamps valid for postcards?
In the U.S., Forever stamps are valued for standard letters, which cost more than postcard stamps. Using a Forever stamp on a postcard covers the cost entirely, though you'll pay a small premium compared to buying a dedicated postcard stamp.
