Paper Size Conversion - Convert A4, Letter, Legal, and More
Understanding Paper Size Standards
Paper size conversions are essential for printing, publishing, and international business. Different regions use various paper size standards (A-series, US Letter, Legal, etc.), and understanding these conversions is crucial for document formatting, printing, and office work.
Common Paper Size Standards
ISO (A/B/C Series)
- A0-A6 - International standard sizes
- B4, B5 - Intermediate sizes
- C4, C5 - Envelope sizes for A-series papers
US/Canada Sizes
- Letter (8.5 × 11 in) - Standard US size
- Legal (8.5 × 14 in) - Legal documents
- Tabloid (11 × 17 in) - Posters, large prints
- Executive (7.25 × 10.5 in) - Memos, notepads
Common Applications
| Field | Paper Types | Typical Uses |
|---|---|---|
| Business | A4, Letter | Reports, letters, contracts |
| Publishing | A5, B5, Executive | Books, booklets, notepads |
| Posters | A3, Tabloid | Large prints, marketing |
| Mailing | C4, C5 | Envelopes for A4/A5 documents |
Conversion Tips
- A4 is slightly taller and narrower than US Letter
- 1 inch = 25.4 millimeters for size conversions
- ISO sizes halve in area from one size to the next (A3 = 2 × A4)
- Always check printer compatibility for non-standard sizes
Paper Size Conversions
| Conversion | Formula | Quick Answer |
|---|---|---|
| A4 to Letter | A4 (210 × 297 mm) ≈ Letter (216 × 279 mm) | A4 is taller, Letter is wider |
| Letter to A4 | Letter (8.5 × 11 in) ≈ A4 (8.27 × 11.69 in) | Letter is shorter, A4 is narrower |
| A3 to Tabloid | A3 (297 × 420 mm) ≈ Tabloid (279 × 432 mm) | A3 is slightly narrower and shorter |
| Tabloid to A3 | Tabloid (11 × 17 in) ≈ A3 (11.7 × 16.5 in) | Tabloid is wider, A3 is taller |
| A5 to Executive | A5 (148 × 210 mm) ≈ Executive (184 × 267 mm) | Executive is larger |
| C4 to A4 | C4 envelope fits A4 paper unfolded | C4 = 229 × 324 mm |
| C5 to A5 | C5 envelope fits A5 paper unfolded | C5 = 162 × 229 mm |
| B5 to A5 | B5 (176 × 250 mm) is larger than A5 (148 × 210 mm) | B5 is for books, A5 for booklets |
| Legal to A4 | Legal (8.5 × 14 in) ≈ A4 (8.27 × 11.69 in) | Legal is longer |
| A4 to Legal | A4 (210 × 297 mm) ≈ Legal (216 × 356 mm) | Legal is longer |
Our paper size conversion tool provides accurate conversions between all major international and US paper sizes, making it easy to format documents, print, and mail worldwide. Whether you're working in business, publishing, or design, our converter ensures precise paper size conversions for any application.
Paper Size Questions
Understanding international paper standards, printing formats, and regional differences
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