A4 is 210 × 297 mm, or 21 × 29.7 cm (approximately 8.27 × 11.69 in). Its pixel dimensions depend on the chosen resolution.
A reproducible calculation
At 300 PPI, width is 21 ÷ 2.54 × 300 = 2,480.3149… pixels. Height is 29.7 ÷ 2.54 × 300 = 3,507.8740… pixels.
Our calculator rounds up to whole pixels to reach at least the target on each side: 2,481 × 3,508 px. Tables that round to the nearest integer may show 2,480 × 3,508. That one-pixel difference comes from the rounding convention.
| Resolution | Minimum width | Minimum height |
|---|---|---|
| 150 PPI | 1,241 px | 1,754 px |
| 200 PPI | 1,654 px | 2,339 px |
| 300 PPI | 2,481 px | 3,508 px |
These sizes cover the full A4 rectangle, without margins or bleed.
A4 is not Letter
Letter is 8.5 × 11 in, or 215.9 × 279.4 mm. At 300 PPI it needs 2,550 × 3,300 pixels for the whole page. Changing the paper selection is different from changing units.
Not every printer covers the entire page. With 10 mm margins, A4’s inner area is 190 × 277 mm. Choose A4 or Letter in the calculator and check your printer. Use the sheet planner for cards: pixel dimensions do not determine how many physical pieces fit.
References and scope
The numerical examples are our own. Check a physical print on your own equipment.