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What unit of measurement are you using? What is the weight of your mail piece? Copyright © 2024 USPS. All Rights Reserved.
USPS postage rates offer low-cost mailing and shipping prices for domestic & international customers. See Forever postage stamp prices and other postage rates.
First-Class Mail Forever ® stamps cost $0.73 (the current 1 oz price) and will never expire, even if the First-Class ™ postage rate goes up. To send packages, see USPS Ground Advantage ® service .
So, how do you determine exactly how many stamps per ounce your letter or package needs? You will need a few pieces of information like the size and weight of the letter, and we will explain all those details here.
Use the USPS Retail Postage Price Calculator to determine postage costs based on weight, shape, and size of mail pieces.
A letter of 1 ounce – 1 Domestic Forever Stamp costs 58 cents. A letter of 2 ounces – 1 Domestic Forever Stamp and one additional ounce stamp at 20 cents costs 78 cents. A letter weighing 3 ounces – 1 Domestic Forever Stamp and two additional 20-cent stamps – costs 88 cents.
To figure out how many stamps you should use to mail a letter or package, first measure the length and width of your letter or the length, width, and height of your package. Then use a scale to weigh your item.
TIP: As a rule of thumb, you can send 1 oz (4 sheets of printer paper and a business-sized envelope) for 1 First-Class Mail ® Forever ® stamp (currently $0.73). The postage for a large envelope (or flat) starts at $1.50 for 1 oz.