Letter Bond Paper Size: Exact Dimensions & Uses

Letter bond paper size is 8.5 inches by 11 inches (216 mm × 279 mm). This is the standard paper size for documents in the United States and Canada.

Why Letter Size Is the Standard

Unlike the A4 paper used in most other countries, Letter size traces its origins to the early days of American papermaking. The 8.5 × 11 inch dimension was not chosen for any mathematical elegance—it evolved from the practical needs of the U.S. government and the paper industry in the 1920s. In 1921, the U.S. government standardized its official paperwork to 8 × 10.5 inches, but after complaints about waste and cost, the size was adjusted to 8.5 × 11 inches in the 1980s. Today, it remains the default for printers, copiers, and filing systems across North America.

Exact Dimensions and Tolerances

Letter paper is precisely defined as 8.5 inches wide and 11 inches tall. In metric terms, that is 215.9 mm by 279.4 mm. Most manufacturers produce paper to a tolerance of ±0.1 mm, so a ream of Letter paper will measure almost exactly to spec. When you buy a ream labeled “Letter,” you can expect those dimensions. The term “bond” refers to the paper’s weight and finish, not its size. Bond paper is a durable, uncoated stock originally used for government bonds. In modern usage, bond paper typically has a basis weight of 20 lb or 24 lb, which translates to a thickness of about 0.004 inches (0.1 mm).

Letter vs. A4 vs. Legal: Key Differences

Letter paper is often confused with A4, the international standard. The two are not interchangeable without adjustment.

• Letter: 8.5 × 11 inches (216 × 279 mm) — used in the U.S., Canada, and parts of Latin America.
• A4: 8.27 × 11.69 inches (210 × 297 mm) — used almost everywhere else. A4 is taller and narrower.
• Legal: 8.5 × 14 inches (216 × 356 mm) — used for contracts and legal documents in the U.S. It is 3 inches longer than Letter.

If you print an A4 document on Letter paper, the bottom margin will be cut off. Conversely, printing Letter on A4 leaves extra white space at the top and bottom. Most modern printers handle both, but you must select the correct paper size in the print dialog.

What Does “Bond” Mean in Paper?

The word “bond” in “letter bond paper” describes the paper’s grade. Bond paper is a high-quality, durable paper made from cotton rag or chemical wood pulp. It is characterized by a smooth, uncoated surface that accepts ink well, making it ideal for letterheads, resumes, and official documents. Bond paper is measured by its basis weight—the weight of a ream (500 sheets) of the basic size. For bond paper, the basic size is 17 × 22 inches. A 20 lb bond paper means 500 sheets of 17 × 22 inch paper weigh 20 pounds. A single sheet of Letter bond paper weighs about 0.16 oz (4.5 g).

Common Uses for Letter Bond Paper

Because of its standard size and durable finish, letter bond paper is the default choice for everyday business and personal printing:

• Business letters and correspondence
• Resumes and cover letters
• Academic papers and reports
• Official forms and contracts
• Photocopies and faxes
• Invoices and purchase orders

Most home and office printers are calibrated for Letter paper. If you buy a printer in the U.S., the default paper size is almost always Letter.

How to Choose the Right Letter Bond Paper

When buying letter bond paper, consider the weight and brightness. Heavier paper feels more substantial and is less likely to show ink bleed. Lighter paper is cheaper and fine for drafts.

• 20 lb bond — standard for everyday copying and printing. Economical and widely available.
• 24 lb bond — a step up, often used for resumes and formal letters. It feels more premium and resists creasing.
• 32 lb bond — heavy, thick paper used for presentations or high-end documents. It is closer to cardstock.

Brightness is measured on a scale of 1 to 100. A brightness of 92 is typical for general office paper. Higher brightness (98–100) makes text crisper and colors more vivid, but costs more. For everyday use, 20 lb paper with 92 brightness is the sweet spot.

Printing and Handling Tips

Letter bond paper is straightforward to use, but a few tips prevent common problems:

• Store paper flat in a dry place. Humidity can cause curling and jams.
• Fan the edges of a new ream before loading to separate sheets that may stick.
• Check your printer’s manual for the correct side to load. Many printers require the print side facing down.
• For double-sided printing, choose paper with a high opacity (usually 24 lb or higher) to prevent show-through.

If you need to mail a letter, Letter paper folds neatly into a standard #10 envelope (4.125 × 9.5 inches). Fold the paper into thirds—bottom up, then top down—to fit the envelope without bulging.

Frequently Asked Questions

Is letter bond paper the same as A4?

No. Letter is 8.5 × 11 inches (216 × 279 mm), while A4 is 8.27 × 11.69 inches (210 × 297 mm). They are close in size but not identical. Documents formatted for one will not print correctly on the other without adjusting margins.

What is the difference between 20 lb and 24 lb bond paper?

The weight refers to the thickness and sturdiness. 24 lb paper is heavier, thicker, and more durable. It feels more substantial and is less prone to ink bleed. For everyday printing, 20 lb is fine; for formal documents, 24 lb is a better choice.

Can I use letter bond paper in a laser printer?

Yes. Most bond paper is compatible with both laser and inkjet printers. However, check the paper package for a printer compatibility symbol. Some bond papers are specifically coated for inkjet or laser to optimize ink adhesion or toner fusing.

How many sheets are in a ream of letter bond paper?

A standard ream contains 500 sheets. This is the industry standard. Some budget packs may contain fewer sheets (e.g., 250), but a ream is always 500.

What does “brightness” mean on a paper package?

Brightness measures how much light the paper reflects, on a scale of 1 to 100. Higher brightness makes text and colors appear sharper and more vivid. It does not necessarily mean the paper is whiter; it refers to reflectance specifically.

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