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Paper Size Conversion
Tool Description
Paper Size Conversion is an online paper size quantity converter with daily free quota — no installation, no registration, ready to use. It supports quantity conversion between A-series (A0-A10), B-series (B0-B10), and common North American paper sizes (Letter/Legal/Tabloid). Enter any quantity of a paper size to instantly view the equivalent quantity in other sizes. All calculations run entirely in your browser, 100% privacy protected. Whether for printing layout, paper procurement, or office printing, its easy to handle — start using it free with professional and reliable results.
How to Use
- Enter Quantity
Type the paper quantity you want to convert, supporting integers and decimals, e.g.,
1,0.5 - Select Source Paper Size
Choose the paper size of your quantity from the dropdown (A0-A10, B0-B10, Letter/Legal/Tabloid)
- View Results
Click the "Convert" button or press Enter, and the result area below will display the equivalent quantity in all other paper sizes. Each result has a copy button for convenience.
Use Cases
- Printing layout: In printing layout work, you need to calculate imposition quantities based on paper size. For example, how many A4 sheets can be cut from one A0 sheet? Use this tool to quickly calculate.
- Paper procurement: When purchasing paper, different suppliers may quote in different size specifications. Use this tool to convert to a standard size quantity for price comparison.
- Office printing: In daily office work, you need to estimate printing usage, such as printing 100 A4 documents — how many A3 sheets is that equivalent to? Calculate with one click using this tool.
Key Advantages
- Daily Free Quota
Free usage is provided every day, so daily paper conversion and imposition calculations cost nothing. Use all features without paying
- Privacy & Security
All conversions run entirely in your browser. Your input data is never uploaded to any server, keeping your data and privacy fully protected
- Wide Size Coverage
Supports 25 paper sizes across A/B series and common North American formats. Enter once to view all equivalent quantities, meeting printing and office needs
- Area-Based Conversion
Strictly converts by paper area ratio — A0 paper area is about 16 times that of A4, giving accurate equivalent quantities
- Ready to Use
No installation, no registration — open the page and start. Works on mobile, tablet, and desktop, so you can calculate paper sizes anywhere
- Easy Copy
Each result has a copy button — click to copy the value and paste it into documents or procurement lists
A-Series Paper Size Reference
A-series paper is the most commonly used paper size defined by ISO 216, halving progressively from A0 to A10:
| Size | Millimeters (mm) | Inches (in) |
|---|---|---|
| A0 | 841 × 1189 mm | 33.1 × 46.8 in |
| A1 | 594 × 841 mm | 23.4 × 33.1 in |
| A2 | 420 × 594 mm | 16.5 × 23.4 in |
| A3 | 297 × 420 mm | 11.7 × 16.5 in |
| A4 | 210 × 297 mm | 8.3 × 11.7 in |
| A5 | 148 × 210 mm | 5.8 × 8.3 in |
| A6 | 105 × 148 mm | 4.1 × 5.8 in |
B-Series Paper Size Reference
B-series paper is also part of the ISO 216 standard, with sizes falling between adjacent A-series sizes, commonly used for posters, books, and envelopes:
| Size | Millimeters (mm) | Inches (in) |
|---|---|---|
| B0 | 1000 × 1414 mm | 39.4 × 55.7 in |
| B1 | 707 × 1000 mm | 27.8 × 39.4 in |
| B2 | 500 × 707 mm | 19.7 × 27.8 in |
| B3 | 353 × 500 mm | 13.9 × 19.7 in |
| B4 | 250 × 353 mm | 9.8 × 13.9 in |
| B5 | 176 × 250 mm | 6.9 × 9.8 in |
Relationship Between A-Series and B-Series
A-series and B-series are both paper size systems defined by the ISO 216 international standard. A-series is based on A0 paper with an area of exactly 1 square meter (841×1189 mm), with an aspect ratio of √2:1. B-series is based on B0 paper with a short side of exactly 1 meter (1000×1414 mm), also maintaining the √2:1 aspect ratio. This ratio ensures the aspect ratio remains unchanged after each fold in half.
B-series paper sizes fall between two adjacent A-series sizes. For example, B4 paper (250×353 mm) falls between A4 (210×297 mm) and A3 (297×420 mm). B5 paper is commonly used for book printing, while Letter and Legal are the most commonly used office paper sizes in North America.
FAQ
Yes, A4 is the most commonly used paper size in daily office work and printing. A-series paper follows the halving rule: each increase in number halves the area. Therefore, 1 A0 sheet = 2 A1 sheets = 4 A2 sheets = 8 A3 sheets = 16 A4 sheets. A4 paper measures 210×297 mm and is the most widely used office paper specification under the ISO 216 international standard.
A-series is based on A0 paper having an area of exactly 1 square meter (841×1189 mm), while B-series is based on B0 paper having a short side of exactly 1 meter (1000×1414 mm). Both maintain the √2:1 aspect ratio. B-series sizes fall between adjacent A-series sizes, commonly used in scenarios requiring sizes between A-series, such as B5 books (176×250 mm) between A5 and A4, and B4 posters (250×353 mm) between A4 and A3.
No, they are different. Letter paper (215.9×279.4 mm) is the standard office paper in North America (US, Canada, etc.), slightly wider but shorter than A4 (210×297 mm). Letter has an area of approximately 60,322 mm², while A4 has approximately 62,370 mm² — A4 is about 3.4% larger than Letter. When using North American standard paper, note the size difference from A4.
Yes, this tool converts based on paper area ratios. For example, A0 paper area is approximately 16 times that of A4, so 1 A0 sheet is equivalent to 16 A4 sheets. B-series to A-series conversions also follow area ratios. Non-integer inputs (e.g., 0.5 A0 sheets) will produce corresponding decimal results (8 A4 sheets).
No. All conversion calculations are performed entirely in your browser locally using pure JavaScript math. Your input data never leaves your device, so please feel free to use it.
This tool supports 25 common paper sizes: A-series (A0-A10, 11 sizes), B-series (B0-B10, 11 sizes), and common North American specifications (Letter/Legal/Tabloid, 3 sizes), covering the most commonly used paper size standards worldwide.
1 A0 sheet = 16 A4 sheets. A-series paper follows the halving rule: each increase in number halves the area. So 1 A0 = 2 A1 = 4 A2 = 8 A3 = 16 A4. Enter the A0 quantity and this tool automatically calculates the equivalent A4 quantity.
Free usage is provided every day, so daily use costs nothing. We prepare a daily free quota for every user, which is enough for basic paper conversion and imposition calculations; if you need more frequent or professional use, a membership unlocks more benefits.
Results are precisely converted based on standard paper areas. The tool strictly calculates using the international standard area of each size, such as A4 (210×297 mm) and Letter (215.9×279.4 mm), delivering accurate and reliable results for printing and procurement.
Yes. The page uses a responsive design and works normally in mobile, tablet, and desktop browsers. On mobile, just enter the quantity, select a size, and tap Convert to see all results. The copy feature is supported too.
Because they follow different paper standards. A4 is an ISO 216 international standard size (210×297 mm), while Letter is a North American standard size (215.9×279.4 mm). A4 is slightly longer but narrower, with an area about 3.4% larger than Letter. This tool converts quantities between the two.
Click the copy icon on the right side of the result box. Each size result has a copy button. Click it to copy the value to your clipboard and paste it into documents or procurement lists without manually selecting text.
Content last updated：2026-08-06
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