Most people are probably most familiar with the First-Class Mail 1-ounce stamp price – it’s the same price no matter where a letter is sent from or to within the United States. A lot of people may also be familiar with the many price options for the Postal Service’s Ground Advantage, Priority Mail, and Priority Mail Express products, which vary by weight and zone.

Did you know USPS actually has a multitude of prices? That is because in addition to households, USPS also serves small-, medium-, and large-sized businesses, including newspapers, advertisers, and retail stores. And these postal customers have a wide variety of postal needs. Business customer prices vary by type of mail, where it is entered, and how the mail is prepared and presorted. You can see the full list of published postal prices here.

Looking to figure out how much it will cost you to send a piece of mail as a household? You can use USPS’s retail calculator.