📄 Paper Sizes
A5 (mm) to A4 (mm) Converter
Convert A5 (mm) to A4 (mm) instantly with a reference conversion table.
A5 (mm) to A4 (mm)
→
Common conversions
| A5 (mm) | A4 (mm) |
|---|
Formula:
How to convert A5 (mm) to A4 (mm)
1
Enter your value
Type the number of a5 (mm) you want to convert into the left box. The result in a4 (mm) appears instantly in the right box. You can also type into the right box to convert in the other direction.
2
Use the swap button
Click the ⇄ Swap button to reverse the conversion — A4 (mm) to A5 (mm). Your current value carries across so you don't have to re-enter anything.
3
About A5 (mm) and A4 (mm)
A5 (mm) and A4 (mm) are common paper measurements.
💡 Did you know?
A5 = 148 × 210 mm = half of A4 (148mm ≈ 210/√2). A5 is the most popular notebook size in the UK (Moleskine, Leuchtturm, Rhodia default to A5). Two A5 pages make one A4 page when placed side by side — allowing efficient double-side booklet printing.
Reviewed for 2026. A5 (mm) ↔ A4 (mm) conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.