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DPI To PPI Calculator

Work out dpi to ppi instantly with clear inputs, formula shown and shareable results.

About DPI To PPI Calculator

PPI describes pixels per inch in an image or on a display, while DPI strictly means printer dots per inch - printers lay several dots per pixel to build colour. What matters for output is the effective ppi: 3000 pixels across 25.4 cm gives exactly 300 ppi, the photographic print standard.

Formulas

Effective resolution

ppi = pixel width / print width in inches

Maximum print size

inches = pixels / target ppi

Worked example

With the default values below, DPI To PPI Calculator returns Effective Resolution of 300.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Image width in pixelsminimum 1 px
3,000 px
Intended print widthminimum 0 cm
25.4 cm

Results

Effective Resolution
300.0 ppi
Print Width In Inches
10.000
Maximum Width At 300 ppi
25.40 cm
Quality Assessment
Photographic print quality

Step by step

  1. 1Values used
  2. 2Effective resolution
  3. 3Maximum print size
  4. 4Effective Resolution= 300.0 ppi
  5. 5Print Width In Inches= 10.000
  6. 6Maximum Width At 300 ppi= 25.40 cm
  7. 7Quality Assessment= Photographic print quality

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Are DPI and PPI interchangeable?

In casual use yes, but strictly no. A 1200 dpi inkjet uses many small ink dots to render each 300 ppi image pixel.

Can I increase resolution by upscaling?

Interpolation adds pixels but no detail. It can help avoid visible pixel edges, but it cannot recover information that was never captured.

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DPI To PPI Calculator – Calculate Effective Resolution