What is the most common paper size?

A4 is the most common paper size globally, used for letters, documents, and printing. It measures 210 × 297 mm (8.27 × 11.69 inches). In the US, Letter size (8.5 × 11 inches) is the most common.

What is the difference between A4 and Letter size?

A4 (210 × 297 mm) is slightly narrower and longer than US Letter (216 × 279 mm). A4 is used in most countries worldwide, while Letter is standard in the US, Canada, and Mexico.

What are the A-series paper sizes?

The A-series includes A0 through A10, from 841 × 1189 mm down to 26 × 37 mm.

What is the B-series paper size?

The B-series includes B0 through B10, from 1000 × 1414 mm down to 31 × 44 mm.

Complete Paper Size List 2026 – All Standards & Dimensions

Complete Paper Size List 2026

Welcome to the most comprehensive paper size guide on the web. Whether you're a designer, printer, student, or business professional, understanding paper sizes is essential. This page covers every standard paper size from the A-series, B-series, and C-series to US paper sizes, complete with dimensions in millimetres, centimetres, inches, and pixels.

📊 Quick Paper Size Facts:
• Most Common: A4 (210 × 297 mm)
• Largest Standard: A0 (841 × 1189 mm)
• Smallest Standard: A10 (26 × 37 mm)
• US Standard: Letter (8.5 × 11 inches)
• Envelope Standard: C4 (324 × 229 mm)
• Ratio: All A, B, C series follow √2 aspect ratio

📄 A-Series Paper Sizes

The A-series is the most widely used paper size standard in the world, defined by ISO 216. Each size is exactly half the area of the previous one, maintaining the same √2 aspect ratio. View full A-series guide →

Size	Millimetres	Centimetres	Inches
A0	841 × 1189 mm	84.1 × 118.9 cm	33.1 × 46.8 in
A1	594 × 841 mm	59.4 × 84.1 cm	23.4 × 33.1 in
A2	420 × 594 mm	42.0 × 59.4 cm	16.5 × 23.4 in
A3	297 × 420 mm	29.7 × 42.0 cm	11.7 × 16.5 in
A4	210 × 297 mm	21.0 × 29.7 cm	8.3 × 11.7 in
A5	148 × 210 mm	14.8 × 21.0 cm	5.8 × 8.3 in
A6	105 × 148 mm	10.5 × 14.8 cm	4.1 × 5.8 in
A7	74 × 105 mm	7.4 × 10.5 cm	2.9 × 4.1 in
A8	52 × 74 mm	5.2 × 7.4 cm	2.0 × 2.9 in
A9	37 × 52 mm	3.7 × 5.2 cm	1.5 × 2.0 in
A10	26 × 37 mm	2.6 × 3.7 cm	1.0 × 1.5 in

📐 B-Series Paper Sizes

The B-series is also defined by ISO 216 but is less common than the A-series. B-series sizes are used for posters, books, and envelopes. View full B-series guide →

Size	Millimetres	Centimetres	Inches
B0	1000 × 1414 mm	100.0 × 141.4 cm	39.4 × 55.7 in
B1	707 × 1000 mm	70.7 × 100.0 cm	27.8 × 39.4 in
B2	500 × 707 mm	50.0 × 70.7 cm	19.7 × 27.8 in
B3	353 × 500 mm	35.3 × 50.0 cm	13.9 × 19.7 in
B4	250 × 353 mm	25.0 × 35.3 cm	9.8 × 13.9 in
B5	176 × 250 mm	17.6 × 25.0 cm	6.9 × 9.8 in
B6	125 × 176 mm	12.5 × 17.6 cm	4.9 × 6.9 in
B7	88 × 125 mm	8.8 × 12.5 cm	3.5 × 4.9 in
B8	62 × 88 mm	6.2 × 8.8 cm	2.4 × 3.5 in
B9	44 × 62 mm	4.4 × 6.2 cm	1.7 × 2.4 in
B10	31 × 44 mm	3.1 × 4.4 cm	1.2 × 1.7 in

✉️ C-Series Paper Sizes

The C-series is specifically designed for envelopes. Each C-series size fits the corresponding A-series size unfolded. View full C-series guide →

Size	Millimetres	Centimetres	Inches
C0	917 × 1297 mm	91.7 × 129.7 cm	36.1 × 51.1 in
C1	648 × 917 mm	64.8 × 91.7 cm	25.5 × 36.1 in
C2	458 × 648 mm	45.8 × 64.8 cm	18.0 × 25.5 in
C3	324 × 458 mm	32.4 × 45.8 cm	12.8 × 18.0 in
C4	229 × 324 mm	22.9 × 32.4 cm	9.0 × 12.8 in
C5	162 × 229 mm	16.2 × 22.9 cm	6.4 × 9.0 in
C6	114 × 162 mm	11.4 × 16.2 cm	4.5 × 6.4 in
DL	110 × 220 mm	11.0 × 22.0 cm	4.3 × 8.7 in

🇺🇸 US Paper Sizes

US paper sizes are based on traditional imperial measurements and differ from the ISO standard. These sizes are primarily used in the United States, Canada, and Mexico. View full US sizes guide →

Size	Inches	Millimetres	Centimetres
Letter	8.5 × 11 in	216 × 279 mm	21.6 × 27.9 cm
Legal	8.5 × 14 in	216 × 356 mm	21.6 × 35.6 cm
Tabloid	11 × 17 in	279 × 432 mm	27.9 × 43.2 cm
Ledger	17 × 11 in	432 × 279 mm	43.2 × 27.9 cm
Executive	7.25 × 10.5 in	184 × 267 mm	18.4 × 26.7 cm
Junior Legal	5 × 8 in	127 × 203 mm	12.7 × 20.3 cm
Half Letter	5.5 × 8.5 in	140 × 216 mm	14.0 × 21.6 cm
Government Letter	8 × 10.5 in	203 × 267 mm	20.3 × 26.7 cm
Government Legal	8.5 × 13 in	216 × 330 mm	21.6 × 33.0 cm

📏 Paper Size Comparison: A4 vs Letter

One of the most common questions is the difference between A4 and US Letter size. Read the full A4 vs Letter guide →

A4: 210 × 297 mm (8.27 × 11.69 inches) – Slightly narrower and taller
Letter: 216 × 279 mm (8.5 × 11 inches) – Slightly wider and shorter
Area: A4 has a slightly larger area than Letter
Usage: A4 is used globally; Letter is used in the US and Canada

🖥️ Paper Sizes in Pixels

For digital design, paper sizes are often expressed in pixels. Here are common pixel dimensions at 300 DPI:

🎨 Common Uses for Each Paper Size

A0, A1: Posters, technical drawings, large advertisements
A2, A3: Posters, diagrams, presentations, architectural plans
A4: Letters, documents, magazines, forms, standard printing
A5: Notebooks, flyers, invitations, small booklets
A6: Postcards, greeting cards, pocket notebooks
A7–A10: Business cards, tags, small labels, mini cards
B-series: Posters, books, envelopes, menus
C-series: Envelopes of all types
US Letter: Standard US documents, letters, forms
US Legal: Legal documents, contracts
US Tabloid: Newspapers, menus, small posters

🧮 Related Calculators & Converters

Use our free tools to convert between different paper sizes and units:

DPI Calculator – Calculate dots per inch
PPI Calculator – Calculate pixels per inch
Image Size Calculator – Determine correct image dimensions
Poster Size Calculator – Find the right poster size
Banner Size Calculator – Find the right banner size
Flyer Size Calculator – Find the right flyer size
Brochure Size Calculator – Find the right brochure size
Business Card Size – Standard business card dimensions
Envelope Size Calculator – Find the right envelope size
PDF Page Size Checker – Check your PDF dimensions
Print Resolution Calculator – Calculate print quality
Aspect Ratio Calculator – Calculate and convert aspect ratios
Paper Size Converter – Convert between all standards

🔄 Pixel Conversions

Pixels to Inches – Convert pixels to inches
Inches to Pixels – Convert inches to pixels
MM to Pixels – Convert millimetres to pixels
CM to Pixels – Convert centimetres to pixels

📚 Paper Size Guides

Explore our detailed guides for each paper series:

A-Series Guide – Complete guide to A-series sizes
B-Series Guide – Complete guide to B-series sizes
C-Series Guide – Complete guide to C-series sizes
A4 vs Letter – Detailed comparison
What is DPI? – Understanding dots per inch
What is PPI? – Understanding pixels per inch
Best DPI for Printing – Print quality guide
Paper Size Standards – ISO vs US standards
Pixel Dimensions Explained – Understanding pixel sizes
Image Resolution for Print – Getting the best print results
Poster Sizes Guide – Complete poster size guide
Banner Sizes Guide – Complete banner size guide
Print Size Guide – Comprehensive print guide

📁 Resources

Paper Size List Summary

📊 Quick Reference:
• A-Series: A0 to A10 (11 sizes)
• B-Series: B0 to B10 (11 sizes)
• C-Series: C0 to C10 + DL (12 sizes)
• US Sizes: Letter, Legal, Tabloid, Ledger, Executive (9+ sizes)
• Total Standards: 40+ paper sizes covered
• Most Used: A4 (global), Letter (US)
• Aspect Ratio: √2 (1:1.414) for all ISO sizes

*All dimensions are standardised according to ISO 216 and ANSI standards. Pixel dimensions may vary based on resolution settings.

Complete Paper Size List