🖥️ Screen resolution checker

My Screen Resolution

See your current screen resolution instantly, including screen size in pixels, available screen, viewport size, device pixel ratio, color depth and orientation. You can also estimate your physical screen size in inches and centimeters.

✓ Automatic detection ✓ Live browser values ✓ No input required

Your screen resolution

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Browser-reported screen dimensions in CSS pixels. Approximate device-pixel dimensions are shown below.

Screen Resolution Details

Use this screen checker to see the dimensions and display information reported by your browser.

Live display data

Screen resolution

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Approx. device pixels

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Viewport size

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Device pixel ratio

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Available screen

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Color depth

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Orientation

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Touch support

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Why can two resolution values appear? Browsers often report the screen in CSS pixels. Multiplying those dimensions by the device pixel ratio gives an approximate device-pixel value, but operating-system scaling means it may still differ from the monitor's advertised native resolution.

Screen Size Estimate

Browsers do not expose your exact physical monitor size, so this automatic result is only a rough estimate.

Device type estimate

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Estimated diagonal

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Confidence

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For a much more useful estimate of your physical screen size in inches or centimeters, use the credit-card calibration.

Credit Card Calibration

Place a standard credit card against your display and move the slider until the on-screen card matches its real width.

Estimated diagonal

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Estimated width

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Estimated height

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Standard Credit Card
85.6 mm × 53.98 mm

Manual calibration is still an estimate. Browser zoom, OS scaling and device pixel ratio can affect the result.

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Resolution vs screen size

Resolution is measured in pixels. Physical screen size is normally measured diagonally in inches.

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Screen vs viewport

Your viewport is only the webpage area inside the browser window, so it can be much smaller than the full screen.

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Instant screen checker

The values above come directly from browser APIs and update when your browser window or display state changes.

Common Screen Resolutions

Common display resolutions range from HD to 4K and beyond. A higher pixel count can provide more detail, but physical screen size and scaling also affect how large content appears.

HD — 1280 × 720

Full HD — 1920 × 1080

QHD / 1440p — 2560 × 1440

4K UHD — 3840 × 2160

Screen Resolution FAQ

Answers to common questions about screen resolution, monitor resolution, screen size and display scaling.

What is my screen resolution?

Your browser-reported screen resolution is shown at the top of this page. We also show an approximate device-pixel resolution so you can compare the CSS-pixel value with a higher-density or scaled display.

How do I check my screen resolution?

Simply open this page. The screen resolution checker reads your screen dimensions automatically, with no form or setup required. It also shows viewport size, available screen space and device pixel ratio.

What is my screen size?

Screen size normally means the physical diagonal of the display in inches. Browsers cannot determine it reliably, so use the credit-card calibration above if you want an estimated physical screen size.

What is my monitor resolution?

The resolution values above show what your browser can detect. Your monitor's native resolution may differ when Windows, macOS or another operating system uses display scaling.

Is screen resolution the same as screen size?

No. Screen resolution describes pixel dimensions such as 1920 × 1080. Screen size describes physical dimensions, usually the diagonal in inches.

Why can my screen resolution differ from my monitor's native resolution?

Operating-system scaling, high-DPI modes and browser behavior can change the CSS-pixel dimensions exposed to a webpage. The approximate device-pixel value above can help explain the difference.

What is viewport size?

Viewport size is the area available to the webpage inside your browser window. Browser toolbars, window size and mobile browser UI can make the viewport smaller than the full screen.

What is device pixel ratio?

Device pixel ratio compares device pixels with CSS pixels. Retina, high-DPI and scaled displays often report a ratio greater than 1, which is why browser dimensions can look different from native hardware specifications.

What are common screen resolutions?

Common examples include 1280 × 720, 1920 × 1080, 2560 × 1440 and 3840 × 2160. The best setting is usually the resolution recommended for your display.

How do I change screen resolution in Windows?

In Windows 11 or Windows 10, open Settings → System → Display, find Display resolution, and select the desired resolution. The recommended setting is usually the best choice.