Postage Calculator
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Formula
Letter: $0.68 for first oz + $0.24 each additional oz. Large Envelope: $1.39 for first oz + $0.24 each additional oz. Package rates vary by weight and distance.
Frequently Asked Questions
How much does it cost to mail a letter?
A standard first-class letter up to 1 oz costs $0.68 (one Forever Stamp). Each additional ounce adds $0.24, up to 3.5 oz maximum for letters.
What is the difference between a letter and a large envelope?
A letter must be rectangular, 6-11.5 inches long, 3.5-6.125 inches high, and up to 0.25 inches thick. Anything larger is a large envelope (flat) or package.