📄 Paper Size Converter

Convert paper sizes instantly between A Series, B Series, C Series, US Letter, Legal, Tabloid and more. Free professional paper size converter for printing, design, and document planning.

📐 Paper Size Converter ISO 216 & US

Select Paper Series

Select Paper Size

Conversion Direction

Enter number of sheets 1 sheet = 1 unit

sheets

1 A4 = 1 A4

Area Ratio: 1:1

📏 From Size 210 × 297 mm 0.0625 m²

📏 To Size 210 × 297 mm 0.0625 m²

📐 Scaling Factor × 1.000 exact same size

📊 Area Difference 0% same area

📏 Full Dimensions All Units

📄 From: A4

Millimeters	210 × 297 mm
Centimeters	21.0 × 29.7 cm
Inches	8.27 × 11.69 in
Points	595 × 842 pt
Picas	49.6 × 70.2 pc

📄 To: A4

Millimeters	210 × 297 mm
Centimeters	21.0 × 29.7 cm
Inches	8.27 × 11.69 in
Points	595 × 842 pt
Picas	49.6 × 70.2 pc

📐 Paper size conversion guide: Convert between A0-A10, B0-B10, C0-C10, and US sizes (Letter, Legal, Tabloid).
Tip: Each step up in A/B/C series doubles the area. US sizes have different scaling ratios.

📊 Paper Size Reference

Complete reference for all standard paper sizes with dimensions in mm.

Size	A Series (mm)	B Series (mm)	C Series (mm)	US Sizes (in)
0	841 × 1189	1000 × 1414	917 × 1297	-
1	594 × 841	707 × 1000	648 × 917	-
2	420 × 594	500 × 707	458 × 648	-
3	297 × 420	353 × 500	324 × 458	-
4	210 × 297	250 × 353	229 × 324	-
5	148 × 210	176 × 250	162 × 229	-
6	105 × 148	125 × 176	114 × 162	-
Letter	-	-	-	8.5 × 11
Legal	-	-	-	8.5 × 14
Tabloid	-	-	-	11 × 17
Ledger	-	-	-	17 × 11
Executive	-	-	-	7.25 × 10.5

📊 Paper Size Conversion Table

Quick reference for converting between common paper sizes. Multiply the number of sheets by the factor.

Convert	To	Factor	Use Case
A4	A3	0.5	Enlarge for posters
A3	A4	2	Reduce for office documents
Letter	Legal	1.27	Legal documents
Legal	Letter	0.786	Standard office printing
A4	Letter	0.953	US document conversion
Letter	A4	1.049	International document conversion
A3	A2	0.5	Larger displays
A2	A3	2	Smaller prints

🖨️ Real‑World Examples: Paper Size Conversion

📄 Office Printing: A4 documents converted to Letter for US printing, or vice versa for international use.
📊 Presentations: A3 sheets enlarged from A4 for impactful presentations and posters.
📬 Legal Documents: Legal size converted to Letter for standard filing and archiving.
🎨 Design & Publishing: B series and C series conversions for book and envelope production.
🖨️ Print Production: Scaling between A0, A1, A2 for large format printing.

💡 Professional Tips for Paper Size Conversion

🎯 Choose the Right Size

Always select the correct paper size before creating your document. A4 for international use, Letter for US use.

📐 Check Margins

When converting between sizes, adjust margins to maintain content layout and readability.

🔄 Scaling vs. Resizing

Scaling changes the page size and content proportionally. Resizing changes the page size only.

📎 Print Settings

Most printers support scaling in the print settings. Use "Scale to Fit" for automatic conversion.

❓ Frequently Asked Questions (Paper Size Converter)

Q: How do I convert A4 to Letter?
A: A4 to Letter factor is 0.953. Multiply A4 sheets by 0.953 to get Letter sheets.

Q: What is the difference between A4 and Letter?
A: A4 is 210×297 mm, slightly narrower and longer than Letter (216×279 mm).

Q: How do I convert Legal to Letter?
A: Legal to Letter factor is 0.786. Multiply Legal sheets by 0.786 to get Letter sheets.

Q: What is the scaling factor between A sizes?
A: Each step in A series halves the area. A3 is 2× A4, A4 is 2× A5.

Q: Can I print A4 on Letter?
A: Yes, use "Scale to Fit" in your printer settings or scale to 94%.

Q: What is the largest paper size?
A: A0 is the largest standard ISO size at 841×1189 mm.

Q: What is the difference between A and B series?
A: B series is larger than A series at the same number. B4 is between A4 and A3.

Q: What are C series envelopes for?
A: C series envelopes are designed to hold A series paper without folding.

Q: What is Tabloid size used for?
A: Tabloid (11×17 in) is used for newspapers, newsletters, and large-format documents.

📈 Why Accurate Paper Size Conversion Matters

Accurate paper size conversion is essential for professional printing, document management, and international communication. Whether you're preparing a document for international clients, printing legal documents, or designing a poster, this tool ensures your documents have the correct dimensions for your needs. Incorrect paper sizes can lead to printing errors, formatting issues, and wasted resources.

🌐 Global Paper Size Standards

The ISO 216 standard defines A, B, and C series paper sizes used globally. The US uses ANSI sizes (Letter, Legal, Tabloid, etc.). Understanding both standards helps ensure your documents work worldwide.

📐 The Full Paper Size Hierarchy

A Series: A0 (841×1189) → A1 → A2 → A3 → A4 → A5 → A6 → A7 → A8 → A9 → A10
B Series: B0 (1000×1414) → B1 → B2 → B3 → B4 → B5 → B6 → B7 → B8 → B9 → B10
C Series: C0 (917×1297) → C1 → C2 → C3 → C4 → C5 → C6 → C7 → C8 → C9 → C10
US Sizes: Letter (8.5×11), Legal (8.5×14), Tabloid (11×17), Ledger (17×11), Executive (7.25×10.5)

Each step up doubles the area, making the system intuitive and easy to scale.

🔗 Explore More Paper Size Tools

Check out our other converters: A4 to A3, A3 to A4, Legal to Letter, Letter to Legal, Letter to A4, A4 to Pixels, and more. All designed to make your document workflows smoother.