Screen PPI Calculator
Pixel density and viewing distance.
Enter your values
Enter the horizontal pixels you are working with.
Enter the vertical pixels you are working with.
Enter the screen size in in.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Pixel density
- 163.2 PPI
- Dot pitch
- 0.1557 mm
- Retina distance
- 1.76 ft
- Total pixels
- 8,294,400
Quick answer
PPI is the diagonal pixel count divided by the screen's diagonal size in inches.
PPI = √(w² + h²) ÷ diagonal
At a glance
| What it does | Pixel density and viewing distance. |
|---|---|
| Category | Technology |
| Inputs needed | Horizontal pixels, Vertical pixels, Screen size |
| Main output | Pixel density |
| Formula | PPI = √(w² + h²) ÷ diagonal |
| Cost | Free — no sign-up, no download |
How to use the Screen PPI Calculator
- 1Enter the horizontal and vertical pixel counts.
- 2Enter the diagonal screen size.
- 3Compare PPI against your viewing distance.
Inputs explained
- Horizontal pixels
- Enter the horizontal pixels you are working with.
- Vertical pixels
- Enter the vertical pixels you are working with.
- Screen size(in)
- Enter the screen size in in.
Worked example
Using the values the calculator loads with:
Inputs
- Horizontal pixels3840
- Vertical pixels2160
- Screen size27 in
Results
- Pixel density163.2 PPI
- Dot pitch0.1557 mm
- Retina distance1.76 ft
- Total pixels8,294,400
Frequently asked questions
What PPI looks sharp?
Above 110 PPI for desktop monitors at normal distance.
Is 4K worth it at 24 inches?
Yes for text sharpness, but scaling is usually required.
What do I need to enter into the Screen PPI Calculator?
Just 3 values: horizontal pixels, vertical pixels, screen size. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Screen PPI Calculator work out the answer?
PPI is the diagonal pixel count divided by the screen's diagonal size in inches. It applies the formula PPI = √(w² + h²) ÷ diagonal and shows the working so you can check each step by hand.
Is the Screen PPI Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.