How much postage for 9x12 envelope? $.78 ... How much postage is required for a 6x8 inch card? It weighs ... How much is us postage for a square envelope?
This all depends on the weight of that envelope. The determine the exact weight take the envelope to a post office and have it weighed.
Large envelopes with a weight of 4 oz will be charged $1.50 for postage on average. However, this rate is only for those envelopes which are not lesser than ...