ScreenBuddy
Download free trial

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
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.

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.

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.
EMBED

Put the Screen Resolution Calculator on your own site

Free to use anywhere, no account and no attribution deal to sign. Paste this where you want it. It loads lazily and adds nothing to your page until a reader scrolls to it.

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>

Please keep the credit line below the frame. It is the only thing we ask for, and because a link inside an iframe belongs to the framed page rather than yours, that one line outside it is what actually credits us.

MORE FREE TOOLS

Match the canvas to your audience

Use the target resolution to plan your canvas, then polish the walkthrough locally in ScreenBuddy for a landing page or launch post.

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.