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Screen Resolution Calculator

Enter a resolution and screen size to get pixel density (PPI), total pixels, aspect ratio, and dot pitch.

Free · No sign-up · Runs in your browser
Common resolutions
Physical screen size for PPI.
Pixel density
81.6PPI
Total pixels
2.07MP
Aspect ratio
16:9
Dot pitch
0.311mm

Keep recording and editing together. ScreenBuddy adds zoom, captions, and local MP4 or GIF export on Mac and Windows.

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How it works

01

Pick or type a resolution

Use a preset like 1080p or enter custom width and height.

02

Add the diagonal size

Enter the screen’s diagonal in inches to compute pixel density.

03

Read the metrics

Get PPI, total megapixels, the simplified aspect ratio, and dot pitch.

Understand any display’s sharpness

Resolution alone does not tell you how sharp a screen looks — a 4K phone and a 4K TV have wildly different clarity because pixel density depends on both the pixel count and the physical size. This calculator combines them into the numbers that actually matter: PPI, total pixels, aspect ratio, and dot pitch.

How do I calculate PPI from width, height, and diagonal?

PPI = √(width² + height²) ÷ diagonal-in-inches. A 1920×1080 panel has a ~2203-pixel diagonal; on 24 inches that is about 92 PPI. On a 27-inch 1440p display you land near 109 PPI; the same 27-inch size in 4K is about 163 PPI. Higher PPI helps UI text in a recording, but capture size and export size still have to match the player.

Why it’s useful

  • Buying a monitor — compare sharpness across sizes and resolutions.
  • Designing UI — know the real density your work will render at.
  • Recording screens — match your capture resolution to the display so labels stay readable after you scale the video down.

Pair this with the aspect ratio calculator for export pixels and the bitrate calculator for file size. Planning a product walkthrough? ScreenBuddy for Mac and Windows lets you edit locally, choose a common output shape, and export MP4 or GIF after licensing.

FAQ

Frequently Asked Questions

What is PPI and why does it matter?
PPI (pixels per inch) is the pixel density of a display — how tightly packed the pixels are. Higher PPI means sharper text and images. It is calculated from the diagonal pixel count divided by the diagonal size in inches. A 27-inch 1440p monitor is about 109 PPI, while a 27-inch 4K is about 163 PPI.
How do I calculate pixel density?
PPI = √(width² + height²) ÷ diagonal-in-inches. For example, a 1920×1080 screen has a diagonal of about 2203 pixels; on a 24-inch monitor that is roughly 92 PPI. This calculator does the full formula for you.
What is a good PPI for a monitor?
For desktop monitors at normal viewing distance, 90–110 PPI is comfortable, 140–160 PPI looks crisp, and 200+ PPI is "Retina"-class. Phones and laptops sit much higher because you view them closer.
What is dot pitch?
Dot pitch is the physical distance between pixels, in millimetres — the inverse of PPI (25.4 ÷ PPI). Smaller dot pitch means a sharper image. It is a classic spec for comparing monitor sharpness.
Is 4K always sharper than 1440p?
Only at the same physical size and viewing distance. A 32-inch 4K panel can look similar to a smaller 1440p panel at desk distance. Compare PPI, not the marketing name, then decide whether your screen recording will still be watched at 1080p.
What capture resolution should I use for a product demo?
Capture at a size where UI text is already readable, then export at the player size. A 5K capture that is scaled to a 640px embed still fails if labels were tiny. Use this calculator to understand the source display, then preview the edit at delivery size.
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HTML · 438 chars
<iframe src="https://screenbuddy.xyz/embed/screen-resolution-calculator" title="Screen Resolution Calculator" width="100%" height="640"
  style="border:0;max-width:720px;border-radius:12px" loading="lazy"></iframe>
<p style="font:14px/1.5 system-ui,sans-serif;margin:8px 0 0">
  <a href="https://screenbuddy.xyz/tools/screen-resolution-calculator">Screen Resolution Calculator</a> by <a href="https://screenbuddy.xyz">ScreenBuddy</a>
</p>

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Match the canvas to your audience

Set your canvas in ScreenBuddy, choose a background and frame, and check that interface labels stay readable at the size viewers will actually watch.

Mac & Windows. No card. Record, edit, and preview free. A one-time license is required to save or export. Media processing stays on your device. Internet is required for license activation and update checks.

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