Estimate pixel spacing from a display’s pixels-per-inch density.
Pixal Per Inch (PPI) Calculator
Form
Results
Dot pitch
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Table of Contents
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What is Pixal Per Inch?
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How to Use This Calculator
- Enter or select PPI.
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
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Formula Used
Pixel pitch in mm = 25.4/PPI
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Variables Explained
| Input | What it means |
|---|---|
| PPI | Pixels per inch, which connects a pixel count with a physical length. |
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Worked Example
At 254 PPI, neighboring pixel centers are about 0.1 mm apart.
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Why Use This Calculator?
Use the formula and worked example to check the relationship between the input and output before carrying the result into a longer calculation.
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Common Mistakes
- A density-based sharpness label does not account for viewing distance, subpixel layout or display quality.
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Frequently Asked Questions
Should I round numbers before calculating?
Keep the original input precision through the calculation and round the final answer to the precision you need. Rounding an intermediate result can change later steps.
Why can a manual calculation differ slightly?
Check the operation, units, signs and rounding first. Equivalent fractions or expressions can look different while representing the same value.
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Sources & References
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