Convert pixels to print size or calculate required resolution. Enter image dimensions and DPI to get print size in inches/cm, or specify print size to find needed pixels.
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12 MP • Aspect ratio 4:3
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Print Size
13.3 × 10"
33.9 × 25.4 cm
Excellent— Professional print quality
Max print at 300 DPI: 13.3 × 10" (33.9 × 25.4 cm)
Required Resolution
2400 × 3000
7.2 megapixels
Aspect ratio: 4:5
About This Tool
Whether you're preparing photos for print, designing posters, or checking if an image has enough resolution — this calculator handles both directions. Enter your image dimensions in pixels and DPI to see the print size, or specify your desired print dimensions to find out how many pixels you need.
DPI (dots per inch) determines print quality. 300 DPI is the standard for professional photo prints and magazines. 150 DPI works for drafts or large posters viewed from a distance. 72 DPI is for screens only — it will look pixelated when printed.
The calculator shows a quality indicator so you know if your image will print sharp or appear pixelated. It also calculates megapixels, aspect ratio, and maximum recommended print size at 300 DPI.
How to Use
1. Choose your mode: "Pixels → Print" or "Print → Pixels"
2. For Pixels → Print: enter width and height in pixels (or select a camera preset), then set DPI
3. For Print → Pixels: enter desired print width and height in inches or cm, then set DPI
4. Read the result with quality indicator
5. Use DPI presets (72, 150, 300, 600) or enter a custom value
6. Check the "Max print at 300 DPI" to see the largest quality print from your image
300 DPI is the standard for high-quality photo prints, magazines, and professional work. At 300 DPI, individual dots are invisible to the naked eye at normal viewing distance. For large posters viewed from several feet away, 150-200 DPI is acceptable. For billboards viewed from far away, even 72 DPI can work.
What's the difference between DPI and PPI?
PPI (pixels per inch) refers to screen/digital resolution — how many pixels fit in one inch of the image. DPI (dots per inch) refers to print resolution — how many ink dots the printer places per inch. In practice, the terms are often used interchangeably. This calculator uses DPI as it's more commonly searched, but the math is identical.
How many pixels do I need to print at 30×40 cm?
At 300 DPI (professional quality): 3543 × 4724 pixels (16.7 megapixels). At 150 DPI (acceptable for posters): 1772 × 2362 pixels (4.2 megapixels). Use this calculator to check any size — enter your dimensions and DPI in 'Print → Pixels' mode.
Can I increase DPI to make a small image print larger?
No — this is a common misconception. DPI is just metadata; it doesn't add pixels. An 1800×1200 pixel image will print at 6×4 inches at 300 DPI, or 12×8 inches at 150 DPI (lower quality). The only way to truly increase resolution is to re-shoot at higher resolution or use AI upscaling tools, which have limitations.
What's the maximum print size for a 12 MP phone photo?
A 12 megapixel image (typically 4000×3000 pixels) can print at: 13.3×10" (34×25 cm) at 300 DPI (excellent quality), or 26.7×20" (68×51 cm) at 150 DPI (good for posters). Modern 48-50 MP phone cameras can print much larger at full quality.
Why does my 300 DPI image look pixelated when I zoom in on screen?
Computer screens display images at screen PPI (typically 72-110 PPI for standard monitors, 220+ for Retina). When you zoom to 100%, you're seeing one image pixel per screen pixel. A 300 DPI image is designed for print viewing at actual size — it will look sharp when printed, not necessarily when zoomed on screen.