This guide breaks down every size you’ll actually run into in the U.S., from Letter and Legal to the international A-series, plus photo paper, envelopes, and custom sizes competitors rarely mention.
Printer Paper Dimensions Chart
| Paper Size | Inches (W × H) | Millimeters (W × H) |
|---|---|---|
| Letter | 8.5 × 11 | 215.9 × 279.4 |
| Legal | 8.5 × 14 | 215.9 × 355.6 |
| Tabloid | 11 × 17 | 279 × 432 |
| A3 | 11.7 × 16.5 | 297 × 420 |
| A4 | 8.27 × 11.69 | 210 × 297 |
| A5 | 5.8 × 8.3 | 148 × 210 |
| A6 | 4.1 × 5.8 | 105 × 148 |
| Photo (4×6) | 4 × 6 | 102 × 152 |
| Photo (5×7) | 5 × 7 | 127 × 178 |
| Envelope #10 | 4.125 × 9.5 | 105 × 241 |
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Standard Printer Paper Dimensions in the United States
Letter Size Paper Dimensions (8.5 x 11 Inches)
Letter size is the default printer paper dimension for almost every home and office printer in America. It measures 8.5 x 11 inches, or 215.9 x 279.4 millimeters. Resumes, school assignments, invoices, and everyday reports all use this size. If you buy a ream of paper at any U.S. store without specifying a size, this is what you’ll get.
Legal Size Paper Dimensions (8.5 x 14 Inches)
Legal size paper measures 8.5 x 14 inches, three inches longer than Letter. Law offices, courts, and contract-heavy industries rely on this size because it fits more text per page. Many home printers can handle Legal paper, but you need to adjust the tray length and select the correct paper dimension in your print settings first.
Tabloid Paper Dimensions (11 x 17 Inches)
Tabloid size, also called Ledger, measures 11 x 17 inches. Newspapers, architectural sketches, spreadsheets with many columns, and presentation posters commonly use this size. It’s exactly double the area of Letter paper, which makes scaling documents up simple.
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International Printer Paper Dimensions Used in the U.S. (A-Series)
A4 Paper Dimensions in Inches and Millimeters
A4 paper measures 210 x 297 millimeters, or 8.27 x 11.69 inches. It’s the closest international match to U.S. Letter size, but it’s slightly narrower and slightly longer. This tiny difference causes real problems: a document formatted for A4 can get cut off or shrink oddly when printed on Letter paper, and vice versa.
A3 Paper Dimensions in Inches and Millimeters
A3 paper measures 297 x 420 millimeters, or roughly 11.7 x 16.5 inches. Designers, architects, and engineers use A3 for blueprints, diagrams, and detailed layouts because it’s exactly double the size of A4, keeping proportions consistent when scaling up.
A5 Paper Dimensions in Inches and Millimeters
A5 paper measures 148 x 210 millimeters, or about 5.8 x 8.3 inches. It’s half the size of A4 and works well for booklets, notepads, and compact flyers. U.S. businesses often use A5 for postcards and small marketing handouts.
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Letter vs A4 Paper Dimensions
Why U.S. Printers Default to Letter, Not A4
American paper standards developed separately from the metric-based ISO system, rooted in older imperial measurements used throughout U.S. manufacturing. That history is why Letter, not A4, became the default in every American printer, template, and word processor.
How to Avoid Print Cutoff Errors Between Letter and A4
Because Letter is wider and shorter than A4, printing an A4 document on Letter paper (or the reverse) often shifts margins and cuts off content. The fix is simple: always check your document’s page setup before printing, and match the paper dimension listed in your file to the paper actually loaded in your printer tray.
Specialty Printer Paper Dimensions (Photo, Envelope and Custom Sizes)
Most paper size guides stop at office documents. But printer paper dimensions extend well beyond Letter and A4, especially for home printing projects.
Photo Paper Dimensions
Common photo paper sizes include 4 x 6 inches, 5 x 7 inches, and 8 x 10 inches. These match standard photo frame sizes, which is why most consumer photo printers list them as default options. Choosing the matching frame size avoids awkward cropping later.
Envelope Size Dimensions for Printing
Standard U.S. envelope sizes include Number 10 (4.125 x 9.5 inches) for business letters and A2 (4.375 x 5.75 inches) for invitations. Printing directly on envelopes requires selecting the correct size in your printer driver, since feeding the wrong dimension often causes misaligned addresses or paper jams.
Custom Paper Size Dimensions and When to Use Them
Many modern printers support custom paper dimensions, letting you set an exact width and height for unusual projects like tickets, bookmarks, or oversized labels. This flexibility matters for small businesses that print non-standard marketing materials regularly.
FAQs About Printer Paper Dimensions
What are the standard printer paper dimensions in the U.S.?
The standard is Letter size, measuring 8.5 × 11 inches. It’s the default size in home and office printers across the country.
Is printer paper Letter size or A4 size?
In the U.S., printer paper is Letter size. A4 is the international standard used across Europe, Asia, and most other countries.
What are the dimensions of A4 paper in inches?
A4 paper measures 8.27 × 11.69 inches, or 210 × 297 millimeters.
What size is legal paper compared to letter paper?
Legal paper measures 8.5 × 14 inches, three inches longer than Letter paper at 8.5 × 11 inches.
How do I change paper size dimensions in my printer settings?
Open your print dialog, select Page Setup or Printer Properties, then choose the correct paper size from the dropdown before printing.
What printer paper dimensions do I need for photos?
Common photo paper dimensions are 4 × 6, 5 × 7, and 8 × 10 inches, matching standard frame sizes.
James Walker is a content researcher and writer specializing in dimensions, measurements, size comparisons, and conversion topics. He creates clear, practical, and easy-to-understand guides that help readers visualize and understand real-world measurements.