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USPS postage rates offer low-cost mailing and shipping prices for domestic & international customers. See Forever postage stamp prices and other postage rates.
Weight and Shape/Size. What unit of measurement are you using? Standard Metric. What is the weight of your mail piece? Pounds. Ounces. Kilograms. Please select from the following options.
Weight, Size, & Shape Requirements. Maximum weight for First-Class Mail letters is 3.5 oz; for large First-Class Mail envelopes, the maximum weight is 13 oz. All postcards and envelopes (or flats) must be rectangular, otherwise an additional charge may apply.
If you want to know how much a postage stamp costs right now, here are the USPS current postage rates and stamp prices.
Calculate the postage price for mailing letters, postcards, flat rate envelopes, boxes and more with the Retail Postage Price Calculator.
Calculate Postcard price. View Flat Rate Envelopes. View Flat Rate Boxes. Calculate price based on Shape and Size.
Weight increments are 1,2,3,4,5,6,7,8 oz then 12 oz, 16 oz, +4oz. So, if you cross 8 oz (or 12), print some photos on your camera -- 5 sheets/ounce of good paper, 6 sheets/ounce of ordinary copy paper (minus a sheet for safety).