【How-to】How many postage stamps do i need

30, 2020, starts at $1.00 for a 1 ounce mailing and maxes out at $3.40 for 13 ounces, the top weight allowed for first class mail. If you are using a regular First-Class stamp, its value is 55 cents, so it would take two stamps to ship at a 1 ounce weight and seven standard stamps for a 13 ounce package.