How much postage do I need for a 1.5 ounce envelope?

The postage required for a 1.5-ounce envelope depends on the mailing service you choose and the destination. For domestic First-Class Mail in the U.S., as of 2023, you typically need to add an additional ounce rate to the standard 1-ounce rate. It's best to check the current rates on the USPS website or visit your local post office for the most accurate postage information.