A ream of copy paper is 500 sheets, the standard retail unit in the US office-supply market.
Whether you’re stocking a home printer or ordering supplies for an office, the word “ream” shows up on every package you pick up. The definition seems simple until you notice the fine print on a specialty paper label. The question of what is a ream of copy paper comes down to one number, a few exceptions, and the way paper is actually sold.
The Standard Definition: 500 Sheets
A ream means 500 sheets of the same paper size, weight, and brightness. For copy paper, that usually comes as one wrapped package made for printers and copiers. This is the number you’ll find on the labels of common brands in US retail stores.
The straightforward math matters for anyone buying paper. One ream is what fits in a printer tray or sits on a shelf without being too heavy to carry comfortably. When you see a price tag on a single package of paper, that price covers exactly 500 sheets.
When a Ream Is Not 500 Sheets
The 500-sheet count is the modern commercial standard, but “ream” has not always meant the same thing. Specialty paper types sometimes break the rule, so the label always deserves a quick check before you buy. Common variations include reams of 250 sheets and some that use 480 or 516 sheets per package.
The main exceptions to know: a half-ream is 250 sheets, and a copier paper case often holds 10 reams, which comes to 5,000 sheets total. Retail listings for standard letter-size copy paper — 8.5 x 11 inches at 20 lb — sell one ream as a package labeled 500 sheets. The sheet count can vary by paper type and seller.
Cost and Common Specs
Pricing for a single ream of standard copy paper sits in the range of $7 to $11 at major US retailers.
A few specs determine whether a ream fits your needs:
- Size: Letter size 8.5 x 11 inches is the default for US offices and home printers.
- Weight: 20 lb standard paper works for most printing, while 24 lb or 28 lb paper feels heavier and suits double-sided documents or professional presentations.
- Use: Standard copy paper works in inkjet printers, laser printers, copiers, and fax machines.
The term “ream” has a common misspelling worth avoiding when you search or order: “rim.” The correct word for a 500-sheet package is always “ream.”
How Much Paper Do You Really Need?
Before you buy, think about how often you print. A single ream of 500 sheets can vanish quickly with daily printing, while a full case of 5,000 sheets offers a noticeably lower cost per sheet for regular use. Shoppers ready to stock up can compare bulk options in our roundup of 10-ream cases of copy paper that breaks down the best value per sheet.
If you print only occasionally, one ream will last months. If you run a busy home office, a 10-ream case saves trips to the store and usually cuts the per-sheet cost. Either way, knowing that a ream equals 500 sheets means you can calculate exactly how many pages your next paper order covers.
References & Sources
- Wikipedia. “Units of Paper Quantity.” Documents the historical and current definitions of a ream, including the 500-sheet standard.
- Quill. “Paper Buying Guide: Package Paper.” Explains how reams are packaged and sold in the office-supply market.
- Staples. “Copy Paper Buying Guide.” Details the standard specs and variations for copy paper reams.
