Your result
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Enter your values, then click Calculate result.How this calculator helps
Calculate pixels per inch for phones and tablets using the physical diagonal and horizontal and vertical resolution. Pixel density helps compare sharpness, although viewing distance and display quality also matter.
How to use it
- 1
Enter the display's horizontal and vertical pixel counts.
- 2
Enter the advertised physical diagonal in inches.
- 3
Compare PPI together with viewing distance and display-quality testing.
Formula and methodology
PPI = √(horizontal pixels² + vertical pixels²) ÷ diagonal inches.
Applies the displayed mathematical relationship directly to the values entered. Users should verify units and any institution-specific interpretation.
Worked calculation example
A 1080 × 2400 display measuring 6.67 inches produces approximately 395 pixels per inch.
How to interpret your result
Calculate pixel density from screen resolution and diagonal size. Read the main result together with the supporting values rather than treating one number as a guarantee. The disclosed method is: PPI = √(horizontal pixels² + vertical pixels²) ÷ diagonal inches.
Input guide
Enter the display's horizontal and vertical pixel counts.
Enter the advertised physical diagonal in inches.
Compare PPI together with viewing distance and display-quality testing.
Scenario comparison
| Scenario | What it demonstrates |
|---|---|
| Worked baseline | A 1080 × 2400 display measuring 6.67 inches produces approximately 395 pixels per inch. |
| Subpixel layout check | Different OLED arrangements can look less sharp at the same nominal PPI. |
| Scaling stress test | Software rendering and resolution modes may reduce effective detail. |
Common mistakes to avoid
- Ignoring subpixel layout: Different OLED arrangements can look less sharp at the same nominal PPI.
- Overlooking scaling: Software rendering and resolution modes may reduce effective detail.
- Failing to test other qualities: Brightness, colour, contrast and flicker are independent from density.
Confirm current price, specifications, warranty and approval status directly before purchasing a phone.
What can affect the result?
Subpixel layout
Different OLED arrangements can look less sharp at the same nominal PPI.
Scaling
Software rendering and resolution modes may reduce effective detail.
Other qualities
Brightness, colour, contrast and flicker are independent from density.
Limits of this estimate
The geometric calculation assumes the stated resolution covers the full stated diagonal and cannot measure subpixel structure or perceived sharpness.
Sources and review information
Frequently asked questions
Is the screen PPI calculator free?＋
Yes. SolvePilot tools are free, work in your browser, and require no account.
Does SolvePilot store my values?＋
No. Calculations run locally in your browser and the values you enter are not sent to a server.
Should I treat the result as an exact bill or quotation?＋
No. Results are informed estimates. Final charges can vary because of taxes, tariffs, lender terms, usage patterns, or provider rules.
How can I improve the accuracy?＋
Use recent values from your own bill, statement or institution, review every assumption, and confirm important results with the relevant official source.
Does higher PPI always mean a better display?＋
No. Brightness, colour accuracy, PWM behaviour, contrast, refresh rate and panel quality also affect the experience.