Print-size calculator

Work out the largest size you can print an image at while keeping a chosen print quality (DPI), from its pixel dimensions.

Image width (px)Image height (px)Print quality (DPI)

Result

Maximum print width

Maximum print height

How to use this calculator

Enter the image's pixel width and height.
Choose your target print quality — 300 DPI is standard for photo-quality prints.
Read the maximum print size at that quality.

300 DPI is a common photo-quality standard; lower DPI values are acceptable for larger prints viewed from further away, like posters.

Technical details: what the fields mean

Image width widthPx: The image's width in pixels.
Image height heightPx: The image's height in pixels.
Print quality dpi: Target print quality — 300 DPI for close-up photo quality, 150 DPI or lower for larger prints viewed from further away.

Methodology

Print width = image width (px) ÷ DPI. Print height = image height (px) ÷ DPI.

Worked example

3600×2400px image at 300 DPI

Inputs: widthPx=3600, heightPx=2400, dpi=300

Result: 12.00in × 8.00in maximum

Practical guidance

For a poster viewed from across a room, dropping to 150 DPI (or even 100 DPI) lets you print significantly larger from the same image without visible quality loss at that viewing distance.

Common mistakes

Assuming an image can be printed at any size regardless of resolution — stretching beyond the DPI-appropriate size for the viewing distance makes it look soft or pixelated.

At 300 DPI (photo quality), 12 x 8 inches. At 150 DPI (fine for a larger print viewed from further away), 24 x 16 inches.