First-Class Mail Flats/Large Envelopes (1 oz.) rates will increase 4 cents to

**$0.98**from $0.94 in 2016. Each additional ounce will cost an extra**$0.21**(no change from 2016). Postcard rates will stay the same at $0.34.Furthermore, how many forever stamps do I need for a 9 by 12 envelope?

**Forever Stamps**are currently worth 50¢ so, for instance, a two ounce flat

**9x12 envelope**would

**need**$1.21 in postage … or three

**Forever stamps**.

How many forever stamps do I need to put on a manila envelope?

The postage required for a large envelope as of this answer (December 28, 2017) is $0.98 for the first ounce + $0.21 for each additional ounce. A Forever stamp is currently valued at $0.49 so you would need

**2 Forever stamps**for a 1 ounce legal-size envelope mailed within the USA.How much does it cost to mail a 1 ounce envelope?

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Post Office/Retail Rates | ||
---|---|---|

Letters | 2018 Postage Rates | 2017 Postage Rates |

First-Class Mail letter (1 oz.) | $0.50 | $0.49 |

First-Class Mail letter - each additional ounce | $0.21 | $0.21 |

First-Class Mail Flat/Large Envelope (1 oz.) | $1.00 | $0.98 |