How to Use This Tool
Enter the Resolution
Type the width and height of the display in pixels, for example 1920 and 1080.
Enter the Screen Size
Type the diagonal size of the screen in inches, for example 24 or 15.6.
Read the Results
The tool instantly calculates pixels per inch (PPI), dot pitch, total pixels, megapixels, and aspect ratio.
Compare Displays
Change the values to compare different screens side by side and see how their density and sharpness differ.
Frequently Asked Questions
Is this tool really free?
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Yes, completely free with no limits and no sign-up. Everything runs in your browser.
Is my data sent to a server?
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No. All calculations happen directly in your browser. Nothing you type is ever sent anywhere.
What is PPI?
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PPI stands for pixels per inch. It measures how densely pixels are packed on a screen. Higher PPI means sharper text and images.
What is dot pitch?
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Dot pitch is the distance in millimeters between the center of one pixel and the center of the next. Smaller dot pitch means higher density and sharper display.
What are megapixels?
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Megapixels is the total number of pixels on the screen divided by one million. A 1920x1080 display has about 2.07 megapixels.
What is the aspect ratio?
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The aspect ratio is the proportional relationship between the width and height, like 16:9 or 4:3. It tells you the shape of the screen.
How is PPI calculated?
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PPI is calculated by dividing the diagonal resolution in pixels by the diagonal size in inches. The diagonal pixel count comes from the width and height using the Pythagorean theorem.
What PPI is considered good?
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For desktop monitors, 90-110 PPI is standard. For laptops, 120-160 PPI is common. For phones, 300+ PPI is typical. Higher PPI means sharper visuals.
Does it update instantly?
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Yes. All results recalculate as soon as you change any input. No button to click.
Can I compare two displays?
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Yes. Enter the specs for one display, note the results, then change the values to see the other. Compare PPI and dot pitch to judge sharpness.
What Is DPI Calculator?
DPI Calculator is a free tool that calculates display density metrics from a screen's resolution and diagonal size right in your browser. Enter the width, height, and screen size and instantly see the pixels per inch (PPI), dot pitch, total pixels, megapixels, and aspect ratio. Nothing you type is ever sent anywhere - all math runs locally on your device.
Use it to compare monitors, laptops, phones, and tablets to understand how sharp each display is and whether it suits your needs.
Features Explained
Pixels Per Inch (PPI)
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The key metric for display sharpness. Higher PPI means pixels are packed more tightly, producing crisper text and images.
Dot Pitch
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The distance in millimeters between adjacent pixels. Smaller dot pitch means finer detail and a sharper image.
Total Pixels
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The total number of pixels on the screen (width times height). Tells you the overall resolution in raw numbers.
Megapixels
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Total pixels divided by one million. A quick way to compare screen resolutions at a glance.
Aspect Ratio
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The proportional shape of the screen, like 16:9, 16:10, or 4:3. Calculated from the width and height you enter.
Three Simple Inputs
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Just enter the width in pixels, the height in pixels, and the diagonal screen size in inches. The tool calculates everything else.
Instant Results
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All metrics update live as you change any input. No Calculate button needed.
Compare Any Display
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Enter specs for monitors, laptops, phones, tablets, or TVs. The tool works for any screen size and resolution.
Clean Results Card
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All calculated values are displayed in a clear card layout so you can read every metric at a glance.
100% Browser-Based
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All math runs directly in your browser. Nothing you type is ever sent to any server.
Who Is This Tool For?
Monitor Shoppers
Compare PPI across monitors before buying to make sure you get the sharpness you want.
Laptop Buyers
Check the PPI of different laptop screens to understand which one will look sharpest.
Phone Reviewers
Calculate and compare PPI across smartphones and tablets for reviews and comparisons.
Graphic Designers
Check whether your monitor has enough PPI for detailed design work.
Web Developers
Understand display density to design responsive layouts that look good on every screen.
Photographers
Verify that your editing monitor has enough PPI for detailed photo retouching.
Video Editors
Compare monitor PPI to choose the best display for color grading and timeline work.
Gamers
Compare PPI across gaming monitors to find the sweet spot between size and sharpness.
UI/UX Designers
Calculate display density to design interfaces that scale correctly on different devices.
Students
Learn about display technology by calculating PPI for different screens.
Teachers
Demonstrate how resolution, screen size, and PPI relate during technology lessons.
IT Buyers
Compare display specs when purchasing monitors for an office or team.
Print Designers
Understand the difference between screen PPI and print DPI for cross-media work.
Digital Artists
Choose a display with the right PPI for detailed illustration and painting.
Streamers
Compare monitor specs to choose the best display for streaming and content creation.
Home Theater Enthusiasts
Calculate PPI for TVs at different viewing distances to find the right size and resolution.
Accessibility Specialists
Evaluate display density for readability and font scaling recommendations.
Phone Developers
Check device PPI to understand how assets will render on different screen densities.
Architects
Choose monitors with enough PPI for detailed CAD and blueprint work.
Scientists
Evaluate display specs for data visualization and microscopy workstations.
Journalists
Compare device display specs for technology reviews and product roundups.
Freelancers
Check whether a monitor or laptop meets your PPI needs before purchasing.
Parents
Compare display sharpness when buying tablets and laptops for children.
Anyone
Quickly calculate the PPI and sharpness of any screen from its resolution and size.
Tips for Best Results
Common resolutions
1920x1080 (Full HD), 2560x1440 (QHD), 3840x2160 (4K), 1366x768 (HD). Enter any of these to see the PPI for your screen size.
Screen size is diagonal
Measure or look up the diagonal measurement of the screen in inches, not the width or height.
Higher PPI = sharper
A 24-inch 4K monitor has about 184 PPI, while a 24-inch Full HD monitor has about 92 PPI. Double the resolution means double the sharpness.
Phone vs monitor PPI
Phones typically have 300-500+ PPI. Monitors usually have 90-160 PPI. This is why text looks sharper on your phone even at lower resolution.
Dot pitch for fine detail
A smaller dot pitch means finer pixels. Professional design monitors often have a dot pitch below 0.2 mm.
Aspect ratio for shape
16:9 is standard widescreen. 16:10 is common on laptops. 4:3 is the old standard. 21:9 is ultrawide.
Compare before buying
Enter the specs of two monitors you are considering and compare their PPI to see which is sharper at the same viewing distance.
Results update instantly
Change any input and all metrics recalculate immediately.
Megapixels for quick comparison
A 4K display has about 8.3 megapixels. A Full HD display has about 2.1 megapixels. More megapixels means more detail.
Privacy is built in
Nothing you type is ever sent to any server. All math runs in your browser.
Privacy & Security
This tool runs 100% in your browser. Your files stay entirely on your own device. Nothing is uploaded, nothing is shared, and no server, advertiser, or third party has access to your files.
If a tool saves your work on your own device, you can remove it at any time using the Clear All button. Some tools rely on an external service to return their result; in those cases, only the minimum data required for the request is sent, and never your files or content. Any ads shown on this page run in an isolated frame and cannot read, touch, or transmit anything you upload, paste, type, or download here. Advertisers may see standard visit information like your IP address and which page you're on, as described in our Privacy Policy, but your data itself stays fully under your control.
