Pixel Pitch CalculatorFree online other calculator — instant results, no sign-up
Calculate physical pixel spacing from pixels per inch.
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About the Pixel Pitch Calculator
The Pixel Pitch Calculator converts pixel density in pixels per inch (PPI) into physical pixel spacing in millimeters. It estimates the center-to-center distance between adjacent pixels on a uniformly spaced display. With the default density of 110 PPI, the calculated pixel pitch is 0.230909 mm.
- Pixel density (PPI)
- The number of pixels per linear inch of the display, expressed in pixels per inch (PPI), with a default value of 110.
Formula and method
p = 25.4 / D; at D = 110 PPI, p = 25.4 / 110 = 0.230909 mm (rounded to six decimal places).
- pPixel pitch: the center-to-center spacing between adjacent pixels, in millimeters.
- DPixel density, in pixels per inch (PPI).
- 25.4The exact number of millimeters in one inch, used to convert inches per pixel to millimeters per pixel.
Take the reciprocal of the PPI value to obtain inches per pixel, then multiply by 25.4 millimeters per inch. Equivalently, divide 25.4 by the PPI value. For the default input, 25.4 divided by 110 gives a pixel pitch displayed as 0.230909 mm.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Pixel density110 PPI
Results
- Result0.230909 mm
How to use the Pixel Pitch Calculator
- 1Find the display's physical pixel density in PPI, rather than a software scaling or image metadata setting.
- 2Enter a positive value in Pixel density (PPI), or keep the default value of 110.
- 3Run the calculation to convert pixel density into millimeters of spacing between pixel centers.
- 4Read the Result row: with 110 PPI, it shows 0.230909 mm.
Reading your result
The Result row reports pixel pitch in millimeters. At 110 PPI, Result = 0.230909 mm means adjacent pixel centers are approximately that far apart. A smaller result indicates more closely spaced pixels and a higher pixel density; a larger result indicates more widely spaced pixels. This is not the width of the illuminated portion of a pixel or the gap between pixel edges.
Limitations
Pixel density must be positive; zero causes division by zero, and negative density has no physical meaning here. A single pitch value assumes uniform spacing and square pixels, or applies only along the direction represented by the entered PPI. The calculation describes full-pixel spacing, not individual subpixel spacing. Its accuracy depends on the input density, and six displayed decimal places do not imply equivalent measurement precision. Pixel pitch alone does not determine perceived sharpness, which also depends on viewing distance and display characteristics.
Common questions
Why does the calculator divide 25.4 by PPI?+
One inch is exactly 25.4 millimeters. Dividing that length by the number of pixels per inch gives the spacing allocated to each pixel in millimeters.
Does 0.230909 mm at 110 PPI describe a pixel's visible width?+
No. It describes center-to-center pixel spacing. The illuminated area may be smaller because of gaps or other structures within the pixel layout.
Can I use an image's PPI metadata to find my screen's pixel pitch?+
No. Image PPI metadata describes an intended physical reproduction scale, not the screen's physical pixel density. Use the display's actual PPI.
Does this calculation give the spacing between red, green, and blue subpixels?+
No. It calculates full-pixel pitch. Subpixel spacing depends on the panel's subpixel arrangement and cannot be determined from PPI alone.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
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Results are estimates for informational purposes and are not financial, medical or legal advice.