Free Image Tools
Image DPI Calculator
Calculate effective print resolution from an image’s pixels and intended physical size.
What this tool does
Check whether an image has enough pixels for its print size.
The calculator divides pixel dimensions by the intended physical dimensions to calculate horizontal, vertical, and effective print resolution.
It uses the lower axis as the effective DPI because that dimension reaches its resolution limit first.
Use the tool
Calculate effective image DPI
Enter the real pixel dimensions and intended print size in inches, centimetres, or millimetres.
Pixels and intended print size
Use the actual pixel dimensions of the image—not the metadata DPI value stored in the file.
Effective resolution
300 DPI
- Horizontal
- 300 DPI
- Vertical
- 300 DPI
The lower axis determines the effective resolution. Around 300 DPI is a common target for close-viewed print.
How to use it
Three quick steps
- 1Enter the image width and height in pixels.
- 2Enter the intended print width and height, then choose the unit.
- 3Review the effective DPI and compare it with the printer or production requirement.
Worked example
Check a 3000 × 2400 image
Printing the image at 10 × 8 inches divides both dimensions by the physical size.
FAQ
Questions about the image dpi calculator
Practical details about using the tool and understanding its result.
Keep working
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