Image Resolution Calculator
Print Width
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Print Height
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Megapixels
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How Image Resolution Affects Print Quality
Print size is determined by dividing pixel dimensions by DPI (dots per inch). A 6000x4000 image at 300 DPI prints at 20x13.3 inches.
Professional photo prints use 300 DPI. Large posters can use 150 DPI. Billboards use 30-72 DPI because they are viewed from far away.
Megapixels equal total pixels divided by one million. A 24 MP camera produces excellent prints up to 20x13 inches at 300 DPI.
Frequently Asked Questions
What DPI should I use for photo printing?
300 DPI for professional prints. 150 DPI for large posters. 72 DPI for billboards viewed from a distance.
How many megapixels do I need?
For 8x10 prints at 300 DPI, 7.2 MP is sufficient. For 16x20, you need 14.4 MP. For 24x36, 25.9 MP or more.
What is the difference between DPI and PPI?
DPI (dots per inch) refers to print output. PPI (pixels per inch) refers to screen display. They are often used interchangeably.
Can I increase image resolution?
Software upscaling makes files larger but does not add real detail. AI upscaling can estimate details with varying results.