A paper size is the standard width and height of a sheet of paper, set by a national or international standard. In the US, Letter (8.5 x 11 in) is the default; internationally, A4 (210 x 297mm) is the standard.
Ever printed a document only to see it cut off at the edges? That usually comes down to paper size confusion. The US uses one system, and most of the world uses another. This guide breaks down every standard paper size you’ll actually run into — US and international — so you pick the right one every time.
What Is a Paper Size?
A paper size is simply the fixed width and height of a sheet, set by a national or international standard. In the USA, that standard is inch-based (Letter, Legal, Tabloid). Almost everywhere else, it’s the metric ISO 216 standard (A4, A3, A5).
Knowing which system applies to your document prevents cut-off margins, wasted ink, and printer errors before they happen.
Standard Paper Sizes in the USA
Standard U.S. paper size comparison showing Letter, Legal, Tabloid/Ledger, and ANSI paper dimensions.
Letter size (8.5 x 11 inches) is the default paper size for nearly every US home printer, resume, and office document. It’s so common that Microsoft Word and Google Docs both default to it automatically in the US.
Legal size (8.5 x 14 inches) is three inches taller than Letter. Law offices use it for contracts and court filings, which is exactly how it got its name.
Tabloid, also called Ledger (11 x 17 inches), fits large spreadsheets, architectural sketches, and small newspapers. It’s twice the area of Letter size, laid out the long way.
For technical drawings, the ANSI series (ANSI A through ANSI E) scales these same proportions up — ANSI A matches Letter, ANSI B matches Tabloid, and so on up to ANSI E at 34 x 44 inches.
International Paper Sizes (ISO A Series) Explained
ISO A-series paper sizes from A0 to A6, showing their dimensions and half-fold relationship.
Outside North America, paper follows the ISO 216 standard, built around the A series. Germany introduced it in the 1920s, and by 1975 it was an official international standard — today it’s used in roughly 180 of the world’s 195 countries.
The logic is elegant: A0 has an area of exactly one square meter. Fold it in half, and you get A1. Fold that in half, and you get A2 — all the way down to the tiny A10. Each size keeps the same aspect ratio of 1:√2 (about 1.41), so nothing gets distorted when you scale up or down.
A4 vs Letter Size — Key Differences
A4 (210 x 297mm, or 8.3 x 11.7 inches) is the world’s default paper size — the rough equivalent of US Letter. The difference is subtle but real: A4 is slightly narrower and noticeably longer than Letter.
That small gap is why an A4 document printed on Letter paper (or vice versa) sometimes loses a line of text at the bottom. Most printer software fixes this automatically with a “fit to page” or “shrink to fit” option.
B Series and C Series Sizes (Brief)
The B series sits between A sizes and covers books,passports, and posters — B5 is a common book trim size. The C series is built specifically for envelopes: a C4 envelope holds a flat, unfolded A4 sheet, while a C5 holds an A4 folded once.
How to Choose the Right Paper Size for Your Document
How to Choose the Right Paper Size for Your Document
Resumes and cover letters stay on Letter in the US, A4 everywhere else — hiring managers expect the local standard, so this isn’t a place to get creative.
Contracts and legal documents often call for Legal size, especially with signature blocks or dense clauses that need extra room.
Posters and presentations usually jump to A3, Tabloid, or larger — anything meant to be seen from a distance needs the bigger canvas.
Invitations, note cards, and flyers work well on A5 or half-Letter sizes, since they’re compact and budget-friendly to print in bulk.
How to Print or Convert Between Paper Size Formats
Paper size conversion guide comparing Letter, A4, Legal, and Tabloid formats with dimensions and A4-to-Letter scaling.
Most software makes this simple. In Word or Google Docs, go to Page Setup or File > Page Setup, then pick your size from the dropdown — Letter, Legal, A4, and Tabloid are all built in.
To convert an A4 file for Letter printing (or the reverse), use your printer’s “fit to page” or “scale to fit” setting. This shrinks the content by a few percent so nothing gets clipped, which matters most for documents with tight margins or tables.
Legal size paper measures 8.5 × 14 inches (216 × 356 mm). It is commonly used for legal documents, contracts, and forms.
What Is the Size of Printer Paper?
The most common printer paper size is Letter, which measures 8.5 × 11 inches (216 × 279 mm) in the United States.
What Size Is Standard Printer Paper?
Standard printer paper in the U.S. is usually 8.5 × 11 inches, known as Letter size. It is the most common size for everyday printing.
What Is A5 Paper Size?
A5 paper measures 5.83 × 8.27 inches (148 × 210 mm). It is commonly used for notebooks, planners, flyers, and small documents.
How Do You Adjust the Paper Size in Canva?
In Canva, open your design and select Resize or create a new design with custom dimensions. Enter the required paper width and height, such as 8.5 × 11 inches for Letter size.
What Size Paper Is A4?
A4 paper measures 8.27 × 11.69 inches (210 × 297 mm). It is the standard paper size used for everyday documents in many countries.
What Is Letter Size Paper?
Letter size paper measures 8.5 × 11 inches (216 × 279 mm). It is the standard document paper size commonly used in the United States.
What Size Is Regular Printer Paper?
Regular printer paper in the U.S. is typically Letter size, 8.5 × 11 inches. This size is widely used for home, school, and office printing.
What Size Is A5 Paper?
The standard A5 paper size is 148 × 210 mm, or approximately 5.83 × 8.27 inches. It is half the size of A4 paper.
What Size Is Normal Printer Paper?
Normal printer paper is usually 8.5 × 11 inches in the United States. This is also called Letter size paper.
What Size Is A3 Paper?
A3 paper measures 11.69 × 16.54 inches (297 × 420 mm). It is commonly used for posters, drawings, charts, and larger documents.
What Is Standard Paper Size?
The standard paper size depends on the country. In the U.S., Letter size is 8.5 × 11 inches, while A4 size is 210 × 297 mm in most countries.
What Is A6 Paper Size?
A6 paper measures 4.13 × 5.83 inches (105 × 148 mm). It is commonly used for postcards, small notes, invitations, and pocket-sized documents.
What Is A3 Paper Size?
A3 paper size is 297 × 420 mm, or approximately 11.69 × 16.54 inches. It is twice the size of A4 paper.
What Size Is A4 Paper in Inches?
A4 paper measures 8.27 × 11.69 inches. Its standard metric dimensions are 210 × 297 mm.
What Is A4 Paper Size?
A4 paper size is 210 × 297 mm, which is approximately 8.27 × 11.69 inches. It is widely used for documents, printing, and office work.
What Size Is A4 Paper?
The standard A4 paper size is 8.27 inches wide × 11.69 inches long (210 × 297 mm).
What Size Is Legal Paper?
Legal paper measures 8.5 × 14 inches (216 × 356 mm). It is longer than standard U.S. Letter paper, which measures 8.5 × 11 inches.
What Size Is Letter Paper?
Letter paper measures 8.5 × 11 inches (216 × 279 mm). It is the most common standard paper size for printing and documents in the United States.
What is the standard paper size in the USA?
Letter size — 8.5 x 11 inches — is the standard paper size for US documents, forms, and printing.
What’s the difference between Letter and A4 paper size?
Letter is 8.5 x 11 inches; A4 is 8.3 x 11.7 inches. A4 is narrower and longer, which can shift text placement when printing across formats.
What do “A series” and “B series” mean?
They’re the two main groups in the international ISO 216 paper standard. A series covers everyday documents; B series covers books, posters, and passports.
What are the most common paper sizes?
Letter and A4 are the most-used sizes worldwide, followed by Legal, A3, and A5.
What’s the difference between A4 and A5?
A5 is exactly half the size of A4 — fold an A4 sheet in half, and you get A5 dimensions.
Do I need different paper when printing documents from other countries?
Not always. Most printers can scale A4 to Letter or Letter to A4 automatically, though margins may shift slightly.
What is Tabloid/Ledger size paper used for?
Tabloid (11 x 17 inches) suits large spreadsheets, architectural drafts, and compact newspaper layouts.
Conclusion
Paper size isn’t just a technical detail — picking the right one keeps your documents looking professional and printing correctly the first time. In the US, that means Letter, Legal, or Tabloid; internationally, it’s A4 and the rest of the ISO 216 family. Match the size to the document type, and the printing part takes care of itself.
Hi, I’m Adrian Blackwell, the author at FramesSizes.com. I help simplify measurements, dimensions, and frame sizes with easy guides and clear explanations — so you can understand sizes quickly and accurately.
