DPI / PPI: The pixel density (dots or pixels per inch)—how densely pixels are packed in physical space. Higher values mean sharper, crisper images.
Photo Quality (≥300 dpi): Industry standard for professional photo printing. Fine details and gradients will print smoothly without visible pixelation.
Good Quality (150–299 dpi): Acceptable for most print uses, like posters or brochures. Fine details may show slight softness up close.
Screen Only (<150 dpi): Too low for photo prints. Suitable only for web display or very large format prints viewed from a distance.
Megapixels (MP): Total pixel count (width × height ÷ 1,000,000). Higher MP supports larger print sizes without quality loss.
How This Calculator Works
This calculator divides the pixel width by the physical width (in inches) to calculate DPI. It then multiplies the total pixel count (width × height) and divides by 1,000,000 to get megapixels. Finally, it assigns a quality rating based on the DPI threshold: 300+ dpi is "Photo Quality," 150–299 dpi is "Good Quality," and below 150 dpi is "Screen Only." These thresholds align with industry print standards.
Quick Questions
What DPI do I need for printing?
300 dpi is the gold standard for sharp photo prints. Magazines use 300 dpi; newspapers use 150 dpi because they're viewed from farther away. For large-format prints (posters) viewed from distance, 150 dpi is often sufficient.
Why does megapixels matter?
More megapixels let you enlarge an image while maintaining DPI. A 12 MP photo can print larger at 300 dpi than a 5 MP photo. However, megapixels alone don't guarantee quality—sensor size and lens quality also matter.
Can I print a low-DPI image at high quality?
Not without loss. Upscaling (interpolation) adds pixels but doesn't add real detail. If your image is below 150 dpi for your print size, it will look soft or pixelated no matter what software tricks you use.