PPI Calculator is most accurate online PPI converter tool to quickly convert and calculate pixels per inch.
Before you start: where to find Width, Height & Diagonal
If you’re measuring a screen (laptop/monitor/phone)
- Width × Height (pixels): Settings → Display → Resolution (e.g., 1920 × 1080).
- Diagonal (inches): product page/specs (e.g., 15.6″, 6.5″). If you only have cm, use the in/cm switch or convert: inches = cm ÷ 2.54.
- If you have aspect ratio (e.g., 16:9) + diagonal in inches and want Width/Height:Let a=16, b=9 ⇒ diag_px = √( (a·k)² + (b·k)² ) = k·√(a²+b²).
If PPI is unknown: first get your resolution (Width × Height). That already is your px values (no math needed).
If you’re checking an image
- Width × Height (pixels): Right-click → Properties/Info → Dimensions (e.g., 4000 × 2667 px).
- Diagonal (inches) depends on the intended physical size (print). If you plan to print at 300 DPI, your print size in inches ≈ width_px ÷ 300 by height_px ÷ 300. Use that diagonal for PPI.
Quick tips
- Don’t know inches? Switch to cm, then the calculator converts to inches internally: inches = cm ÷ 2.54.
- Just have resolution? That already gives you Width/Height in px — enter them directly in the ppi calculator.
- Common searches we cover: ppi how to calculate, pixel ppi calculator, how to use a PPI calculator.
Formula & How PPI is calculated
Step-by-step
- Enter Width and Height in pixels (e.g., 1920 × 1080).
- Enter Diagonal in inches (or switch to cm: inches = cm ÷ 2.54).
- Compute the pixel diagonal: √(width² + height²).
- Divide by diagonal in inches to get PPI.
Examples
- Laptop 1920×1080, 15.6″ → √(1920²+1080²)/15.6 ≈ 141.2 PPI.
- Phone 1080×2400, 6.5″ → √(1080²+2400²)/6.5 ≈ 405.0 PPI.
- Print size hint: For a 300 DPI target, a 3000×2000 px image prints at ≈ 10″ × 6.67″ (diagonal ≈ 12″).
Still wondering “How do I calculate PPI?” or “how to use a PPI calculator”? Just plug your values above — the pixel ppi calculator shows PPI instantly and can help you estimate px/mm, px/cm, and print sizes at common DPI targets.
Explain the fields
Get them from your image or display specs (e.g. 1920 × 1080). On Windows/Mac: check file Properties/Info for images. On displays: Settings → Display → Resolution. Perfect for a display ppi calculator or monitor ppi calculator.
From product specs (e.g. 13.3″, 27″) or measure corner-to-corner. If you only have centimeters, enter cm and use the in/cm switch, or convert first: inches = cm ÷ 2.54.
For print workflows, a common target is 300 DPI. A 3000 × 2000 px image at 300 DPI prints about 10″ × 6.67″. Use PPI to check if your pixels are enough for sharp prints.
Quick PPI Examples
Here are common display resolutions with their approximate PPI values. Useful if you want to know
how many PPI is 1920×1080 or compare a 4K resolution monitor at different screen sizes.
1920×1080 @ 24″ → ~92 PPI
1920×1080 @ 27″ → ~82 PPI
2560×1440 @ 27″ → ~109 PPI
3840×2160 (4K) @ 27″ → ~163 PPI
Pixels to Print Size (300 DPI)
When preparing images for printing, a standard 300 DPI is used to ensure sharp quality.
This section explains how to calculate print size from pixels and vice versa.
Perfect for anyone searching for a Free PPI calculator for printing,
Pixels to print size calculator, or even the Best PPI calculator for printing.
Formulas:
Inches = Pixels ÷ DPI
Pixels = Inches × DPI
(Example: 300 DPI in pixels width and height)
Common Print Sizes @ 300 DPI
| Print Size | Pixels (at 300 DPI) |
|---|---|
| 4 × 6 in | 1200 × 1800 px |
| 5 × 7 in | 1500 × 2100 px |
| 8 × 10 in | 2400 × 3000 px |
| A4 (8.27 × 11.7 in) | 2481 × 3508 px |
| Letter (8.5 × 11 in) | 2550 × 3300 px |
This Pixel to print size chart makes it easy to check the right resolution for common photo and document sizes.
PPI ↔ DPI (Common Confusion)
PPI (pixels per inch) describes the pixel density of digital images and displays, while DPI (dots per inch) is used for printers and refers to how many ink dots are placed in one inch.
In practice, both terms often share the same numeric value in calculations. That’s why any ppi to dpi conversion calculator or PPI to DPI converter will give you the same number — the difference is in context, not in math.
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Monitor PPI presets (Approximate)
Approximate values for the most common monitor sizes and resolutions. Useful for answering questions like
What is a good PPI for a monitor? or
How many PPI is 2560×1440?
| Size | 1920×1080 (1080p) | 2560×1440 (1440p) | 3840×2160 (4K) |
|---|---|---|---|
| 13.3″ | ~166 PPI | ~221 PPI | ~331 PPI |
| 14″ | ~157 PPI | ~210 PPI | ~316 PPI |
| 15.6″ | ~141 PPI | ~188 PPI | ~283 PPI |
| 24″ | ~92 PPI | ~122 PPI | ~184 PPI |
| 27″ | ~82 PPI | ~109 PPI | ~163 PPI |
Rule of thumb: ~90–110 PPI is standard for desktop viewing, ~110–140 PPI is comfortable for close work/reading, and 160+ PPI delivers crisp text and high-definition details.
Phone PPI ranges (Optional)
- Entry/Budget phones: ~250–320 PPI
- Mid-range phones: ~320–430 PPI
- Flagship/High-end phones: ~430–550+ PPI
Keywords: What is a good PPI for a monitor, How many PPI is 2560×1440?, PPI calculator for printing, Pixel to print size chart, 4K resolution.
How to get your diagonal
To calculate PPI you need the screen’s diagonal size in inches. Here are the most reliable ways to get it:
- Product page: Check the official specs on the manufacturer’s website.
- Back label: Many monitors and laptops list diagonal size on the rear sticker or packaging.
- Manual measurement: Measure from one corner of the screen to the opposite corner (diagonally).
- Unit conversion: If your measurement is in cm, simply convert: inches = cm ÷ 2.54.
Keywords: How do you find out your PPI?, How do I figure out my PPI?
FAQs – PPI Calculator
How to calculate PPI?
Use the formula: PPI = √(width² + height²) ÷ diagonal. Enter width/height in pixels and diagonal in inches.
How do I calculate PPI for printing?
For printing, divide pixels by the target DPI (commonly 300). Example: 3000 px ÷ 300 DPI = 10 inches print size.
Is 300 PPI the same as 300 DPI?
Practically yes. For display we say PPI, for printers we say DPI — but numerically they are the same.
How many PPI is 1920×1080?
It depends on the diagonal. Example: 24″ ≈ 92 PPI, 27″ ≈ 82 PPI.
What is a good PPI for a monitor?
Around 100–140 PPI is comfortable for everyday use. Above 160 PPI gives sharper text and high-definition clarity.
1920×1080 pixels per inch?
Full HD resolution. PPI depends on diagonal: 15.6″ ≈ 141 PPI, 24″ ≈ 92 PPI, 27″ ≈ 82 PPI.
Pixels to print size calculator?
See our Pixels to Print Size (300 DPI) section for formulas and a full chart.
PPI calculator for printing online?
Our online tool is free, fast, and accurate. No downloads or installations required.
PPI calculator government / APK?
The web version works on any device. No need for an APK or government version — just use the online calculator.
How to use a PPI calculator?
Enter width and height in pixels, plus diagonal in inches. The calculator instantly shows PPI. Try with 2560×1440 @ 27″ → ~109 PPI.
Related Tools
Explore more free calculators to handle all your pixel, print, and screen conversions:
- DPI calculator – check dots per inch for printing and display.
- PPI calculator – measure pixels per inch for monitors and images.
- px to in – convert pixels to inches instantly.
- px to cm – quick pixels to centimeters converter.
- px to mm – convert pixels to millimeters online.
- pt to px – convert points to pixels (perfect for typography and text sizes).
Conclusion
Calculating PPI is a simple formula — all you need is width, height (in pixels) and the correct diagonal (inches or cm).
Choose the right diagonal and you’ll instantly know the sharpness of your display or image.
For more details, see
Wikipedia – Pixel density
and
Image resolution.
UX ideas & extra features
- Switch in ↔ cm for diagonal input with instant conversion.
- Extra results: px/mm, px/cm, and diagonal pixels = √(width² + height²).
- Presets: quick options for 1080p, 1440p, and 4K at common diagonals (24″, 27″).
- Copy & share: one-click copy of results or share via URL with parameters.
- Smart validation: input checks with short guiding messages.