What is A4 size in cm?
A4 paper measures 21.0 x 29.7 cm.
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Paper Size Chart (A4 in CM, A3 in Inches, A0-A6)
This quick paper size chart shows ISO A-series dimensions from A0 to A6 in millimeters, centimeters, and inches for printing, framing, and layout planning.
A0 to A6 Paper Sizes
All values below follow ISO 216 standard dimensions.
| Format | Millimeters (mm) | Centimeters (cm) | Inches (in) |
|---|---|---|---|
| A0 | 841 x 1189 | 84.1 x 118.9 | 33.11 x 46.81 |
| A1 | 594 x 841 | 59.4 x 84.1 | 23.39 x 33.11 |
| A2 | 420 x 594 | 42.0 x 59.4 | 16.54 x 23.39 |
| A3 | 297 x 420 | 29.7 x 42.0 | 11.69 x 16.54 |
| A4 | 210 x 297 | 21.0 x 29.7 | 8.27 x 11.69 |
| A5 | 148 x 210 | 14.8 x 21.0 | 5.83 x 8.27 |
| A6 | 105 x 148 | 10.5 x 14.8 | 4.13 x 5.83 |
Instant Answer
A4 measures 21.0 x 29.7 cm and 8.27 x 11.69 inches. A3 measures 29.7 x 42.0 cm and about 11.69 x 16.54 inches. Use the chart below when you need a fast paper-size conversion without opening a spec sheet.
A0 to A6 Paper Sizes
All values below follow ISO 216 standard dimensions.
| Format | Millimeters (mm) | Centimeters (cm) | Inches (in) |
|---|---|---|---|
| A0 | 841 x 1189 | 84.1 x 118.9 | 33.11 x 46.81 |
| A1 | 594 x 841 | 59.4 x 84.1 | 23.39 x 33.11 |
| A2 | 420 x 594 | 42.0 x 59.4 | 16.54 x 23.39 |
| A3 | 297 x 420 | 29.7 x 42.0 | 11.69 x 16.54 |
| A4 | 210 x 297 | 21.0 x 29.7 | 8.27 x 11.69 |
| A5 | 148 x 210 | 14.8 x 21.0 | 5.83 x 8.27 |
| A6 | 105 x 148 | 10.5 x 14.8 | 4.13 x 5.83 |
Common Questions
What is A3 size in inches?
A3 paper is about 11.69 x 16.54 inches.
Why do A-series paper sizes keep the same ratio?
Every A-size sheet keeps an aspect ratio close to 1:√2, so folding or scaling preserves proportions.
Why paper dimensions matter
Paper size questions are usually the start of a larger print workflow. People search for A4 in centimeters or A3 in inches because they need to configure software, buy frames, prepare files for clients, or build templates that will export cleanly. Using the exact paper dimensions early prevents clipping, awkward scaling, and ratio mismatches later in the process.
This page works best as the first checkpoint before you move into DPI, pixel requirements, and bleed setup. Once the final format is locked, the rest of the production math becomes much easier to manage.
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