How much postage for a 10 x 13 envelope?

The postage for a 10 x 13 envelope depends on its weight and the mailing service you choose. For a standard First-Class Mail envelope weighing up to 1 ounce, the cost is typically around $1.20 as of 2023. Additional weight will increase the postage cost, so it's best to weigh the envelope and check the current rates on the USPS website or at your local post office for the most accurate pricing.