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.
Herein, how much does it cost to mail a 9x12 envelope?
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.
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 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|