Calculate ppi

Pixels per inch = diagonal pixel count divided by diagonal size in inches.

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Horizontal pixels

Vertical pixels

More inputs and assumptions

Diagonal size (inches)

Answer

…

Pixels per inch = diagonal pixel count divided by diagonal size in inches.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Step-by-step calculation

Inputs are substituted below. Each line evaluates the next operation; intermediate values are displayed to 12 significant digits while the calculation uses full precision.

Saved scenario

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Formula and assumptions

Assumes square pixels and the stated active display diagonal. This is pixel density, not a measure of viewing comfort or optical sharpness.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Calculate ppi

Pixels per inch = diagonal pixel count divided by diagonal size in inches.

Assumes square pixels and the stated active display diagonal. This is pixel density, not a measure of viewing comfort or optical sharpness.

Next: Basic calculator

A worked example

With horizontal pixels = 1920, vertical pixels = 1080, diagonal size (inches) = 24, the pixels per inch is 91.7877987534291.

Before you use the result

Assumes square pixels and the stated active display diagonal. This is pixel density, not a measure of viewing comfort or optical sharpness.

Example results for horizontal pixels

These examples use Vertical pixels: 1080; Diagonal size (inches): 24. They are reference calculations, not recommended settings.

Horizontal pixels	Pixels per inch
960	60.207972894
1920	91.7877987534
3840	166.207701386

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ToolOctopus. “Calculate ppi.” Updated 2026-09-26. https://tooloctopus.com/ppi-calculator.

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