The first answer is incorrect. Only the first ounce of letter weight is covered by a 44 cent US Postage stamp. You need to add 17 cents for each of the 2nd and 3rd ounces; and the price (for a standard letter envelope) maxes out at 95¢ for 3.5 ounces Since 32 grams is over one ounce (actually around 1.13 oz.), you'd need 61 cents of postage to mail a standard letter envelope domestically within the United States. Additional charges apply for non-standard envelope shapes or additional services such as express mail or proof of delivery
The cost of one first class stamp, 44 cents. That covers the cost up to 3.5 oz.The only additional charge would be if the size or shape made it unreadable by machine. Then there is an additional surcharge. It is just a flat rate for first class postage. It goes up over 3.5 oz, but it doesn't go down for under.