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DPI Calculator
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This DPI Calculator works in two directions: given an image's pixel dimensions and the size you plan to print it at, it computes the resulting DPI (dots per inch) and flags whether that's print-quality; or given a target DPI and print size, it tells you the minimum pixel dimensions your image needs. 300 DPI is the common benchmark for sharp photo prints, while 150 DPI is often acceptable for larger format or less close-up viewing. It's useful for photographers, designers, and anyone ordering prints who wants to confirm an image won't come out pixelated before submitting it. Everything runs locally in your browser. Scroll down to choose a mode and enter your numbers.
Features
- Calculates DPI from pixel dimensions and print size
- Calculates required pixel dimensions from a target DPI
- Flags print quality (excellent/good/low) based on the result
- Instant recalculation as you switch modes or adjust values
Why use this dpi calculator?
- Avoids ordering a print that comes out pixelated
- No manual division required
- Fully private — nothing uploaded
- Free with unlimited use
Frequently asked questions
What DPI do I need for a good print?
300 DPI is the standard benchmark for sharp, close-viewing photo prints; 150 DPI is often acceptable for large posters or displays viewed from a distance.
What's the difference between DPI and PPI?
PPI (pixels per inch) describes image/screen resolution, while DPI (dots per inch) technically refers to printer output — in practice the terms are used interchangeably for print-sizing purposes.
My image is 3000×2000px printed at 10×6.67in — is that good?
That works out to 300 DPI on both dimensions, which is excellent for a sharp photo print — this is the calculator's default example.
Does resizing an image in an editor change its actual detail?
No, changing the DPI metadata alone doesn't add real detail; to genuinely increase print DPI at the same size, the image needs more actual pixels (a higher-resolution source or AI upscaling).
Does this calculator resize my image?
No, it only calculates numbers from the dimensions and print size you enter — it doesn't process an actual image file.