Print Size Calculator
Find the maximum print size your image resolution supports at 300, 200, and 150 DPI. See quality ratings for standard print sizes.
Calculator results are estimates based on simplified optical formulas. Actual results vary by lens, camera, and shooting conditions. Use these as starting points, not precise measurements.
Understanding Print Resolution
DPI (dots per inch) describes how densely pixels are packed when printed. Higher DPI means more detail per inch and sharper results when viewed up close. The critical question isn't just resolution — it's the ratio of your pixel count to your intended print size.
The 300 DPI Standard
300 DPI became the standard for professional photo printing because it matches the typical resolution of photo inkjet printers and is generally beyond what the human eye can resolve at arm's length. For most consumer printing and framing scenarios, 300 DPI is the target.
Viewing Distance Changes Everything
A 24×36 inch poster printed at 150 DPI looks sharp when you're standing 6 feet away. The same poster at 75 DPI would look pixelated up close but fine on a wall. Large format printing (billboards, trade show displays) is often done at 72 DPI or lower because viewing distances are much greater.
What Camera Resolution Do You Actually Need?
| Print Size | Pixels at 300 DPI | Min Megapixels |
|---|---|---|
| 4×6" | 1200×1800 | 2 MP |
| 8×10" | 2400×3000 | 7 MP |
| 11×14" | 3300×4200 | 14 MP |
| 16×20" | 4800×6000 | 29 MP |
| 20×30" | 6000×9000 | 54 MP |
Frequently Asked Questions
What DPI do I need for professional photo prints?
300 DPI is the standard for professional-quality prints viewed at normal distances (arm's length). For large format prints displayed on walls and viewed from several feet away, 150–200 DPI is usually sufficient. Screen display uses 72–96 DPI.
Can I upsize photos to print larger?
Yes, but with limits. Modern upscaling software (like Lightroom's Enhance feature or Topaz Gigapixel) can intelligently add pixels, often allowing prints 2–3x larger than raw resolution would suggest. Results depend heavily on the original image quality and content.
How many megapixels do I need for a 16x20 print?
A 16x20 inch print at 300 DPI requires 4800 × 6000 pixels — about 29 megapixels. At 200 DPI, the same print needs only 3200 × 4000 pixels, which is around 13 megapixels. Most modern cameras from 20MP up can produce high-quality 16x20 prints.
Does image quality matter beyond megapixels?
Absolutely. A technically sharp, well-exposed 20MP image will print far better than a noisy, slightly soft 45MP image. Sharpness, noise, and exposure quality matter more than raw resolution for most print sizes people actually display at home.