The cost of postage for a 6x8 card if it is within the limit of weight it will only cost one postage stamp, which is $0.49. If it weighs more, it will cost more and need to be weighed at the post office.
That depends what country you're mailing it from and what country you're mailing it to.
Within the United States, a 4x8 inch card will cost 46¢, whether or not it's in an envelope. (The maximum size for the 33¢ postcard rate is 4¼x6.)
According to the USPS website a 6x6 inch postcard would be $.49 for domestic mail in the U.S. The maximum size for a postcard to receive the $.34 rate is 6 inches long by 4 1/4 inch wide.
insufficient information it deoends on how much the card weighs but probobly one stamp
Within the US it is 28 cents for a 4 by 6 inch card.
Postage in 1966 was 5 cents for a letter up to one ounce. Fora post card it was 4 cents.
Postage to Mexico on a 6" x 4 1/4" postcard is $.80. Web site USPS.com is good for these types of questions.
As of September 2014, it costs $1.15 to ship a post card internationally. If it exceeds 4 3/4 inches high or 9 1/4 inches long, you will be charged the First Class Mail International price.
A birthday card in the mail will cost 49 cents. A post card will cost 34 cents and can be no larger than 4" by 6".
1st class letter price which is 46 cents as of Oct 2013
The current postcard postage as of the new increase in Jan '09 is: First-Class Mail® Postcards ($0.27 each) Maximum size: 6 inches long by 4-1/4 inches high First-Class Mail® Large Postcards ($0.42 each) More than: 6 inches long by 4-1/4 inches high
Postage depends on the size and weight of the letter you are sending. USPS first-class mail stamps start at forty four cents for letters under two ounces.
For the first six days of 1963 it cost 4 cents to mail a letter in the U.S. Beginning on 7 January 1963 it cost 5 cents.
It depends on where you are sending it from and to .28 is the postage for postcards up to 4 1/4" by 6". Anything larger goes at the standard first class rate of .44
For flat paper items, postage goes by weight, not by size.