DPI / PPI Calculator

Calculate DPI/PPI and print dimensions from pixel count and physical size instantly in your browser. Free online DPI calculator and image resolution converter.

One edge of the image in pixels.
The same edge of the print in inches.

Loading calculator…

Results

Result —
DetailValue
Quality guidance—
Pixels—
Inches—

What is this calculator for?

Determine a print’s resolution (DPI/PPI) from its pixel dimensions and physical size.

How to Use This Calculator

Enter the values below, then press Calculate (or press Enter). The calculator updates your results instantly. Try different values to see how your inputs change the outcome.

  1. Pixel dimension — enter a numeric amount.
  2. Physical size (inches) — enter a numeric amount.
  3. Review your results — the key output is highlighted, with supporting figures below.

What You'll Need

Pixel dimension
a numeric amount range 1–∞ · required
Physical size (inches)
a numeric amount range 0.01–∞ · required

About This Calculator

DPI (dots per inch) and PPI (pixels per inch) tell you how densely an image’s pixels are packed onto the print surface — the higher the number, the finer the detail.

Divide the pixel dimension by the physical inch size to get DPI. The tool also gives guidance: 300 DPI is the photo-print standard, 150 is fine for large posters, and 72 is screen-resolution territory.

Calculation runs entirely in your browser.

Worked Examples

Example

2400 px over 8 in → 300.0 DPI

Frequently Asked Questions

What is the difference between DPI and PPI?
PPI refers to pixels in an image per inch of display/print; DPI refers to dots the printer lays down. For preparing images on-screen they are commonly treated as equivalent.
What DPI do I need for a sharp print?
300 DPI is the standard for crisp photo prints viewed up close. Below ~150 DPI, detail appears soft when viewed at arm’s length.