Paper Size Visualizer
Compare paper sizes visually. See how A3 compares to A5, Letter to Legal, and more.
(~150mm)
| Size | Dimensions (mm) | Dimensions (in) | Area (cm²) | Common Use |
|---|
📖 Complete Guide to Paper Sizes - ISO, US, and International Standards
Understanding paper sizes is essential for anyone working with print design, documents, or office materials. Our Paper Size Visualizer helps you compare different paper formats visually, making it easy to understand the relationships between various sizes used around the world. Whether you're preparing a design for print, choosing the right paper for a project, or simply curious about international paper standards, this comprehensive guide and interactive tool will provide all the information you need.
Paper sizes vary significantly between regions. While most of the world uses the ISO standard (A4, A3, etc.), North America primarily uses the Letter and Legal formats. Understanding these differences is crucial when sharing documents internationally, printing materials for global distribution, or working with printers and publishers in different countries.
📐 The ISO Paper Size System Explained
The ISO 216 standard defines the A, B, and C series of paper sizes used internationally. This elegant system is based on a simple mathematical principle that makes scaling and copying incredibly efficient.
| Size | Dimensions (mm) | Dimensions (inches) | Area | Common Applications |
|---|---|---|---|---|
| A0 | 841 × 1189 | 33.1 × 46.8 | 1 m² | Technical drawings, large posters, architectural plans |
| A1 | 594 × 841 | 23.4 × 33.1 | 0.5 m² | Flip charts, large diagrams, engineering drawings |
| A2 | 420 × 594 | 16.5 × 23.4 | 0.25 m² | Posters, diagrams, calendars, artwork prints |
| A3 | 297 × 420 | 11.7 × 16.5 | 0.125 m² | Drawings, large tables, small posters, certificates |
| A4 | 210 × 297 | 8.27 × 11.69 | 0.0625 m² | Standard office paper, letters, magazines, documents |
| A5 | 148 × 210 | 5.83 × 8.27 | 0.031 m² | Notepads, booklets, flyers, organizer pages |
| A6 | 105 × 148 | 4.13 × 5.83 | 0.016 m² | Postcards, small flyers, pocket notebooks |
| A7 | 74 × 105 | 2.91 × 4.13 | 0.008 m² | Pocket notes, tickets, playing cards |
🔢 The Mathematics Behind ISO Paper Sizes
The ISO paper size system is based on a brilliant mathematical concept. Each size maintains an aspect ratio of 1:√2 (approximately 1:1.414). This means that when you fold a sheet in half along its longest side, the resulting half-sheet has the exact same proportions as the original. This property makes it easy to scale documents up or down without changing their proportions.
- A0 = 1 square meter: The base size A0 has an area of exactly 1 m², making calculations simple
- Each size = half the previous: A1 is half of A0, A2 is half of A1, and so on
- Aspect ratio = 1:√2: All sizes maintain the same width-to-height ratio
- Two A4 = One A3: Two A4 sheets placed side by side equal exactly one A3 sheet
- Scaling is exact: Reducing A3 to 71% creates an A4, enlarging A4 to 141% creates an A3
🇺🇸 North American Paper Sizes
The United States, Canada, and Mexico use a different paper size system that doesn't follow the ISO mathematical relationships. These sizes evolved from historical manufacturing practices rather than mathematical principles.
| Size Name | Dimensions (inches) | Dimensions (mm) | Common Use |
|---|---|---|---|
| Letter | 8.5 × 11 | 216 × 279 | Standard office paper, default printer size |
| Legal | 8.5 × 14 | 216 × 356 | Legal documents, contracts, some official forms |
| Tabloid/Ledger | 11 × 17 | 279 × 432 | Newspapers, large-format printing, spreadsheets |
| Executive | 7.25 × 10.5 | 184 × 267 | Memos, letters, personal stationery |
📄 A4 vs Letter: The Key Differences
The most common point of confusion is the difference between A4 (used worldwide) and Letter (used in North America). While they appear similar, their differences can cause formatting issues when sharing documents internationally.
| Attribute | A4 | US Letter |
|---|---|---|
| Width | 210 mm (8.27 in) | 216 mm (8.5 in) |
| Height | 297 mm (11.69 in) | 279 mm (11 in) |
| Comparison | Narrower and taller | Wider and shorter |
| Area | 623.7 cm² | 603.2 cm² |
| Usage | 210+ countries | USA, Canada, Mexico |
💡 Design Tip: When creating documents for international distribution, design for A4 with appropriate margins that will also print correctly on US Letter paper. A safe margin of at least 15mm on all sides ensures content won't be cut off regardless of the paper size used for printing. Many software applications have options to automatically scale content to fit different paper sizes.
📚 ISO B Series Paper Sizes
The B series provides sizes between the A series dimensions. B sizes are calculated as the geometric mean between consecutive A sizes, making them useful when A sizes don't quite fit the need.
- B0 (1000 × 1414 mm): Large posters, wall charts, billboard sections
- B1 (707 × 1000 mm): Posters, large printing projects
- B2 (500 × 707 mm): Posters, large prints, wall calendars
- B3 (353 × 500 mm): Newspapers, menus, large flyers
- B4 (250 × 353 mm): Books, newspapers, large magazines
- B5 (176 × 250 mm): Books, magazines, larger notebooks
✉️ C Series: Envelope Sizes
The C series is specifically designed for envelopes. Each C size envelope is designed to fit the corresponding A size paper perfectly:
- C4: Fits A4 unfolded - standard document mailers
- C5: Fits A4 folded once (or A5 unfolded) - most common business envelope
- C6: Fits A4 folded twice (or A5 folded once, A6 unfolded) - standard letter envelope
- DL (110 × 220 mm): Fits A4 folded into thirds - the most popular envelope size worldwide
❓ Frequently Asked Questions About Paper Sizes
A4 paper measures 210 × 297 mm (8.27 × 11.69 inches), while US Letter measures 216 × 279 mm (8.5 × 11 inches). A4 is narrower but taller than Letter. This difference can cause formatting issues when printing documents designed for one size on the other. A4 is the international standard used in over 210 countries, while Letter is primarily used in the United States, Canada, and Mexico. When designing documents for global distribution, consider using safe margins that work for both sizes.
The A series is based on two key principles: A0 has an area of exactly 1 square meter, and each subsequent size is exactly half the area of the previous size. All sizes maintain an aspect ratio of 1:√2 (approximately 1:1.414). This means folding any A size in half along its longest edge produces the next size down (folding A3 in half creates A4). This mathematical relationship makes scaling simple: reducing to 71% goes down one size, enlarging to 141% goes up one size, with no distortion.
The best poster size depends on viewing distance and location. For small indoor posters viewed up close, A3 (297 × 420 mm) works well. A2 (420 × 594 mm) is good for medium posters in shops or offices. For large display posters, A1 (594 × 841 mm) provides excellent visibility from several meters away. A0 (841 × 1189 mm) is used for very large displays and exhibitions. B series sizes (B1, B2) are also popular for posters as they're slightly larger than their A counterparts, providing more visual impact.
The US Letter size predates the ISO standard and was based on traditional papermaking practices. When paper was handmade, a common mold size produced sheets around 17 × 22 inches, which when folded and cut became the familiar 8.5 × 11 inches. By the time the ISO standard was developed in 1975, the US had already established an extensive infrastructure around Letter and Legal sizes, making a switch economically impractical. Government efforts to metricate in the 1970s-80s included paper sizes but never gained widespread adoption.
Several envelope sizes work for A4 paper depending on how it's folded: C4 (324 × 229 mm) fits A4 unfolded - ideal for documents that shouldn't be creased. C5 (229 × 162 mm) fits A4 folded in half - popular for formal correspondence. C6 (162 × 114 mm) fits A4 folded into quarters. The DL envelope (110 × 220 mm) fits A4 folded into thirds and is the most common business envelope size worldwide, designed specifically for standard letters.
Most design software (Adobe Creative Suite, Canva, etc.) has preset paper sizes built in. To scale between A sizes, use 71% to go smaller (A3→A4) or 141% to go larger (A4→A3). When converting between A4 and Letter, you may need to adjust margins rather than simply scaling, as the aspect ratios differ. Many applications offer "Fit to Page" or "Scale to Fit" options that automatically adjust content. For print-ready files, always confirm the correct size and bleed settings with your printer before finalizing artwork.
Why Ads?
Ads help keep DC Tools free and running. Thank you for your support!
Found a Bug?
Help us improve! Report issues and suggestions.