A3 paper is bigger than A4 paper.
To understand the size difference, it's helpful to look at the A-series paper sizes. This series is based on a geometric ratio where each size is half the size of the previous one when folded in half along its longest side.
Here's a comparison:
- A4: Commonly used for everyday printing, documents, and letters.
- A3: Twice the size of A4. It's often used for posters, diagrams, and larger documents.
| Paper Size | Dimensions (mm) | Dimensions (inches) |
|---|---|---|
| A3 | 297 x 420 | 11.7 x 16.5 |
| A4 | 210 x 297 | 8.3 x 11.7 |
As you can see from the table, both the width and height of A3 paper are larger than A4 paper. A3 is effectively two A4 sheets side-by-side.
