Can you mail a 6x8 card with one stamp

In the United States, the United States Postal Service (USPS) has a weight-based pricing system for mail. The cost of mailing a card depends on its weight, size, and destination.

A 6x8 inch card is considered a large envelope, and its weight is typically around 1-2 ounces. According to the USPS, a large envelope weighing 1 ounce or less can be mailed for:

However, if the card weighs more than 1 ounce, you'll need to add additional postage. For example, if the card weighs 2 ounces, you'll need to add $0.15 to the cost of postage, making it:

So, to answer your question, you can mail a 6x8 inch card with one Forever Stamp if it weighs 1 ounce or less. If it weighs more than 1 ounce, you'll need to add additional postage.

Keep in mind that these prices are subject to change, so it's always a good idea to check the USPS website or consult with a postal worker for the most up-to-date information.