What is the Postage Rate for First Class Letter?

As long as the letter is under 1 oz in weight you can send it first class for $0.44. Up to 2 oz is $0.61, 3 oz is $0.78, and 3.5 oz is $0.95. If you only have a short message to send, consider a postcard. It will only cost you $0.28 to mail.