Free print tool
Poster & Image Print Size Calculator
Convert pixels to poster size, check effective PPI/DPI, or find the pixels needed for A4, A3, 18 × 24, and 24 × 36 prints.
px
168 PPI · Good
300 PPI quick reference
Common poster sizes in pixels at 300 PPI
At 300 PPI, A2 needs 4,961 × 7,016 pixels and an 18 × 24 inch poster needs 5,400 × 7,200 pixels. Use the calculator above for a custom size or a different PPI.
| Size | Print dimensions | Required pixels |
|---|---|---|
| A4 | 21 × 29.7 cm | 2,480 × 3,508 px |
| A3 | 29.7 × 42 cm | 3,508 × 4,961 px |
| A2 | 42 × 59.4 cm | 4,961 × 7,016 px |
| A1 | 59.4 × 84.1 cm | 7,016 × 9,933 px |
| 8 × 10 | 8 × 10 in | 2,400 × 3,000 px |
| 12 × 18 | 12 × 18 in | 3,600 × 5,400 px |
| 18 × 24 | 18 × 24 in | 5,400 × 7,200 px |
| 24 × 36 | 24 × 36 in | 7,200 × 10,800 px |
What size can I print my image?
Print inches = pixels ÷ PPI. A 2048 × 2048 image prints about 6.8 × 6.8 inches at 300 PPI, or 13.7 × 13.7 inches at 150 PPI. Changing only the DPI metadata does not create new pixels or make the image sharper.
PPI vs DPI
PPI describes image resolution on paper. DPI describes how a printer places ink dots. People often search for “300 DPI image size,” but pixel-to-print calculations use PPI.
Is 300 PPI always necessary?
- 300 PPI
- Close-viewed photos and detailed artwork
- 240 PPI
- High-quality general prints
- 150 PPI
- Large posters viewed farther away
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