Letter Size Envelope Postage. View domestic letter prices for more information. For postage rates on items from other countries, check the postal website of the originating country.
Enter the weight of the envelope in pounds and ounces. The cost of a standard 2nd class stamp at letter rate is 61p. Being rigid alone will not make a letter size envelope (6 1/8th x 11.5) a package.
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Regular delivery timetable (incl gst) $3.30. Any envelope larger than the maximum dimensions for a united states postal letter (6 1/8 inches high, 11 1/2 inches long and 1/4 inch thick) requires extra postage. 130 x 240 x 5mm. Your envelope will need to be less than 240mm x 165mm and weigh less than 100g, plus the thickness under 5mm, to qualify for this postage rate, so you could use a c6, dl or c5 envelope to fit within this size range.