The conversation between human and AI assistant.
How many stamps do I need to send a letter in the usa?
What if I send a large envelope, like a manila envelope?
For large envelopes (flats) weighing up to 1 ounce, you'll need $1. That can be achieved by using one Forever Stamp plus another stamp worth at least $0.15, or by using two Forever Stamps. For each additional ounce or fraction of an ounce, you'll need another $0.20.