The standard dimensions of printer paper in the United States and Canada, commonly known as Letter size, are 8.5 by 11 inches (215.9 by 279.4 mm). In contrast, the international standard for printer paper is A4, which measures 8.27 by 11.69 inches (210 by 297 mm). Knowing these measurements is essential for configuring document layouts, setting up print jobs, and purchasing the correct paper for your office equipment.
Choosing the wrong paper size can lead to formatting issues, cut-off text, or frustrating printer jams. This guide will break down all the standard dimensions used globally so you can print with confidence. Let us dive into the details of paper sizing systems.
what are the dimensions of printer paper – Complete Size Guide
When asking what are the dimensions of printer paper, the answer depends heavily on your geographic location. The global paper industry is divided into two primary standard systems: the North American system and the international ISO 216 standard. North America relies on traditional sizes like Letter and Legal, while the rest of the world uses the metric-based A-series.
The North American system evolved from historical paper-making practices, where paper molds were operated by hand. The standard Letter size of 8.5 x 11 inches remains the default for standard home and office printers across the United States, Canada, and parts of Mexico. Most software applications automatically default to this size when your region is set to North America.
Meanwhile, the ISO 216 standard is used by almost every other country globally. The A-series is designed around a strict mathematical ratio of 1 to the square root of 2. This unique ratio ensures that when you cut a sheet in half, the resulting halves retain the exact same aspect ratio as the original sheet. This makes scaling documents up or down incredibly simple for graphic designers and publishers.
Dimensions and Measurements
To accurately answer what are the dimensions of printer paper, we must look at the specific measurements of each standard size. Printers today are designed to handle multiple formats, but they require precise configurations to feed the paper correctly through the rollers. Below is a detailed breakdown of the most common paper sizes you will encounter in offices and print shops.
The table below lists the dimensions in inches, millimeters, and centimeters for both North American and International standards. This reference will help you quickly convert measurements when setting up custom print layouts.
| Paper Size Name | Dimensions (Inches) | Dimensions (Millimeters) | Dimensions (Centimeters) | Primary Region & Use |
|---|---|---|---|---|
| Letter | 8.5″ x 11.0″ | 215.9 x 279.4 mm | 21.59 x 27.94 cm | North America (Standard Office) |
| Legal | 8.5″ x 14.0″ | 215.9 x 355.6 mm | 21.59 x 35.56 cm | North America (Contracts/Agreements) |
| Ledger / Tabloid | 11.0″ x 17.0″ | 279.4 x 431.8 mm | 27.94 x 43.18 cm | North America (Posters/Blueprints) |
| A4 | 8.27″ x 11.69″ | 210.0 x 297.0 mm | 21.0 x 29.7 cm | International (Standard Office) |
| A3 | 11.69″ x 16.54″ | 297.0 x 420.0 mm | 29.7 x 42.0 cm | International (Drawings/Charts) |
| A5 | 5.83″ x 8.27″ | 148.0 x 210.0 mm | 14.8 x 21.0 cm | International (Flyers/Notebooks) |
As you can see, international A4 paper is slightly narrower and longer than North American Letter paper. This small difference can cause significant formatting issues if a document formatted for A4 is printed on Letter paper, often causing the bottom lines of text to be cut off.
Size Comparison
When visualizing what are the dimensions of printer paper compared to everyday items, it helps to look at common objects. A standard US Letter sheet is roughly the size of a standard plastic clipboard. If you place a Letter-sized sheet next to an A4 sheet, you will notice the A4 sheet is about a quarter-inch narrower but nearly three-quarters of an inch taller.
For larger projects, Ledger or Tabloid paper is exactly double the size of a standard Letter sheet. You can think of a Tabloid sheet as two Letter sheets placed side-by-side along their 11-inch edges. This size is commonly used for newspapers, newsletters, and large-format spreadsheets.
On the smaller end of the spectrum, A5 paper is exactly half the size of an A4 sheet. It is roughly equivalent to the size of a standard paperback book or a small greeting card. Knowing these visual relationships makes it easier to estimate the scale of your documents before hitting the print button.
How to Measure Correctly
If you ever find yourself without a label and need to know what are the dimensions of printer paper in your tray, you can easily measure it manually. To get an accurate reading, place the paper flat on a hard surface to prevent bowing or bending. Use a rigid metal ruler rather than a flexible tape measure for the most precise results.
Measure the width of the paper first by placing the ruler across the shorter edge. Next, measure the height by aligning the ruler along the longer edge. Make sure you align the “zero” mark of the ruler precisely with the edge of the paper, as some rulers have a small gap before the measurement scale begins.
If you need to convert your measurements between imperial and metric systems, you can use these simple formulas:
- Inches to Millimeters: Multiply the inches by 25.4 (e.g., 8.5″ x 25.4 = 215.9 mm).
- Millimeters to Inches: Divide the millimeters by 25.4 (e.g., 297 mm / 25.4 = 11.69″).
- Inches to Centimeters: Multiply the inches by 2.54 (e.g., 11″ x 2.54 = 27.94 cm).
Once you have measured your paper, check your printer software settings. Most printer drivers allow you to select the exact paper size loaded into the tray to ensure the print heads align perfectly with the physical edges of the sheet.
Size Chart
This comprehensive chart summarizes what are the dimensions of printer paper across a wider variety of specialized formats. From compact memo sizes to large-scale drafting sheets, these dimensions are standard across the printing industry.
| Paper Format | System | Width x Height (Inches) | Width x Height (Millimeters) |
|---|---|---|---|
| Half Letter (Statement) | North American | 5.5″ x 8.5″ | 139.7 x 215.9 mm |
| Executive | North American | 7.25″ x 10.5″ | 184.2 x 266.7 mm |
| Letter | North American | 8.5″ x 11.0″ | 215.9 x 279.4 mm |
| Legal | North American | 8.5″ x 14.0″ | 215.9 x 355.6 mm |
| Foolscap (Folio) | Traditional British | 8.27″ x 13.0″ | 210.0 x 330.0 mm |
| A6 | ISO International | 4.13″ x 5.83″ | 105.0 x 148.0 mm |
| A5 | ISO International | 5.83″ x 8.27″ | 148.0 x 210.0 mm |
| A4 | ISO International | 8.27″ x 11.69″ | 210.0 x 297.0 mm |
| A3 | ISO International | 11.69″ x 16.54″ | 297.0 x 420.0 mm |
| A2 | ISO International | 16.54″ x 23.39″ | 420.0 x 594.0 mm |
Understanding these variations allows you to select the ideal paper size for specific business needs. Whether you are printing pocket-sized brochures on A6 or legal briefs on Legal paper, matching the document design to the physical dimensions ensures a professional result.
FAQ
Is A4 paper the same size as US Letter paper?
No, A4 and US Letter are not the same size. A4 paper is slightly narrower and taller, measuring 8.27 x 11.69 inches, while US Letter paper measures 8.5 x 11 inches. Using A4 files on Letter paper can cause layout issues if settings are not adjusted.
Why is standard US printer paper 8.5 by 11 inches?
The 8.5 x 11-inch dimension dates back to the days of manual papermaking. A standard mold size was easily handled by papermakers, and a sheet of that size could be folded into quarters for standard book sizes. The size was officially standardized by the US government in the early 20th century.
What are the dimensions of legal size printer paper?
Legal size printer paper measures 8.5 by 14 inches (215.9 by 355.6 mm). It shares the same width as standard Letter paper but is 3 inches longer, providing extra space for long-form legal contracts and accounting spreadsheets.
How do I change the paper size settings on my computer?
You can change the paper size in your word processor or PDF viewer by navigating to the “Page Setup” or “Print Settings” menu. Select your desired paper size (such as Letter or A4) from the dropdown list to ensure the software matches the paper loaded in your printer.
Can a standard home printer print on A4 and Letter paper?
Yes, most modern home and office printers feature adjustable plastic guides in the paper feed tray. You can slide these guides inward or outward to secure either Letter or A4 paper, preventing the paper from feeding crookedly during printing.