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Find Screen Size

Viewport

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Screen

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Screen resolution in physical pixels

Screen Size in Other Units

Viewport

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Screen

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DPR

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Device Pixel Ratio

DPI

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Dots per Inch

DPPx

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Dots per Pixel

DPCM

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Dots per Centimeter

Aspect Ratio

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Screen aspect ratio

Color Depth

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Bits per pixel

Orientation

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Device orientation

Avail. Screen

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Excluding taskbar/dock

Responsive Breakpoints

sm <640px md <768px lg <1024px xl <1280px 2xl <1536px ≥1536px

System & Browser

OS—
Browser—
Engine—
Language—
Touch—
CPU Cores—

Display Details

CSS Viewport—
Physical Screen—
Device Pixel Ratio—
Color Depth—
Pixel Depth—

Find Your Screen Size Online — Accurate & Free

Need to find your screen size quickly? Our online screen size checker gives you instant, accurate measurements of your browser viewport and physical display. Whether you want to find screen size of laptop, desktop monitor, or mobile device, this tool detects everything automatically — no downloads or installations required.

Unlike generic screen resolution websites, this tool provides a complete picture of your display. You get your my screen size in pixels, plus real-world measurements in inches, centimeters, and millimeters. Want to find screen size in inches? Switch the unit selector above to see your viewport and screen dimensions in your preferred unit. Need to find screen size in cm or find screen size in mm? It is all displayed in real time.

Screen size online tools are essential for web developers, designers, and anyone building digital experiences. Our tool goes beyond basic resolution checking — it provides your accurate screen size with actual screen size measurements that update live as you resize your browser. Whether you are debugging responsive layouts or checking my screen info for system diagnostics, you get the real screen size with zero guesswork.

This is a free screen size tool with no ads, no signups, and no tracking. All data stays in your browser — we never send your screen information to any server. The screen size tool reports include Device Pixel Ratio (DPR), Dots Per Inch (DPI), aspect ratio, color depth, and orientation. If you need to find screen size on computer or find screen size windows system, the tool detects your OS and browser automatically for complete screen info.

Designers can use the accurate screen tool to verify design specs match actual displays. Developers rely on the actual screen tool for responsive debugging — the built-in breakpoint detection shows which Tailwind CSS breakpoints your viewport matches in real time. The interactive rulers let you measure any element on your page by overlaying pixel-accurate guides on the viewport edges.

Our online screen size tool gives you everything you need to understand your display. From the screen size online checker to detailed my screen info reports, every measurement updates automatically when you resize your browser. This makes it the ideal free screen info resource for responsive web design, CSS debugging, and device compatibility testing.

Bookmark this page to find screen tool whenever you need accurate display measurements. Whether you are checking online screen size for a new monitor, verifying my screen size online for development work, or comparing online screen info across devices, Find Screen Size is the most comprehensive screen info tool available — completely free, private, and accurate.

Frequently Asked Questions

Common questions about checking and measuring screen size.

How do I check my screen size?
Visit findscreensize.com to check your screen size instantly. The tool automatically detects your viewport dimensions, physical screen resolution, DPR, DPI, and aspect ratio. All data is processed locally in your browser with no tracking.
How to measure screen in cm?
Use the unit selector on findscreensize.com to switch between inches, centimeters, and millimeters. The tool converts your viewport and screen dimensions using your device's DPI. Simply click cm above the Screen Size in Other Units section to see your screen size in centimeters.
How do I calculate screen size?
Screen size is calculated from your device's physical pixel resolution divided by its DPI (dots per inch). For viewport size, we use window.innerWidth and window.innerHeight. For physical screen size, we use screen.width and screen.height. All calculations happen in real time on findscreensize.com.
How do I know my screen size?
The easiest way to know your screen size is to use an online tool like findscreensize.com. It displays your exact viewport dimensions, screen resolution, and pixel density instantly. No downloads, extensions, or technical knowledge required.
What is my phone screen size?
Open findscreensize.com on your phone to see your device's viewport size, screen resolution, DPR, and aspect ratio. The tool works on all mobile devices and shows both CSS pixels and physical pixel measurements.
Can I check my screen size?
Yes. findscreensize.com checks your screen size automatically when you visit the page. It displays your browser viewport dimensions, physical screen resolution, available screen area, DPI, and more. All data stays on your device.
How to find screen size of laptop?
To find the screen size of your laptop, visit findscreensize.com from your laptop browser. The tool instantly shows your laptop's viewport size, screen resolution, and display information including DPR, DPI, aspect ratio, and color depth.
How to find laptop screen size?
Open findscreensize.com on your laptop to find its screen size. The tool displays the exact viewport width and height in CSS pixels, physical screen resolution, and converts to inches, centimeters, and millimeters. Works on Windows, macOS, and Linux laptops.
How to find my laptop screen size?
findscreensize.com makes it easy to find your laptop screen size. Just open the website and all your display information appears automatically. You get viewport dimensions, physical resolution, DPI, aspect ratio, and unit conversions without any setup.
How to find the screen size of my laptop online?
findscreensize.com is the best way to find your laptop screen size online. No downloads or extensions needed. The tool detects your display specs in real time and shows them in pixels, inches, cm, and mm. It also shows DPR, DPI, and aspect ratio.
How to find iPad screen size?
Open findscreensize.com on your iPad to find its screen size. The tool detects your iPad's viewport dimensions, screen resolution, DPR, and orientation. It automatically updates when you rotate your device between portrait and landscape modes.