What is my screen resolution?
Find your screen resolution and your browser window size, with the device pixel ratio, colour depth and orientation. The numbers update as you resize the window.
Nothing to enter. Resize the window or rotate your device and the numbers update.
About this tool
Find your screen resolution and your browser window size, with the device pixel ratio, colour depth and orientation. The numbers update as you resize the window.
Part of SmartCalcy’s data & networking tools. It runs in your browser with no account, uses your own currency and units (change them at the top of the page), and gives estimates for information only, so check official guidance before you rely on a result.
How to use the what is my screen resolution?
What it calculates and when to use it
Shows your screen resolution and your browser window size, with the device pixel ratio, colour depth, available screen area and orientation. The numbers update as you resize the window or rotate the device.
How to use it, step by step
- Open the page. Nothing needs to be entered.
- Read the resolution at the top and the physical pixel count below it.
- Resize the window or rotate your phone to see the window size change.
- Press “Copy result” to share the numbers.
What each input means
- Nothing to enter – Values are read from your browser.
How to read the results
- Screen resolution – Width and height in CSS pixels.
- Physical pixels – CSS pixels multiplied by the pixel ratio.
- Browser window – The size of the page area right now.
- Pixel ratio, colour depth, orientation – Extra display details your browser reports.
The formula
Physical pixels = CSS pixels × device pixel ratio. A phone reporting 390 × 844 at a ratio of 3 has 1,170 × 2,532 physical pixels. Aspect ratio is the width and height divided by their greatest common divisor.
A worked example
A laptop reports 1440 × 900 with a ratio of 2, so the panel has 2,880 × 1,800 physical pixels.
Assumptions and limits
- Zoom and operating-system scaling change the reported numbers.
- On multiple monitors the value is for the screen the window is on.
Common mistakes
- Reading the CSS resolution as the panel’s native resolution on a high-density screen.
- Comparing the window size with the screen size. They differ whenever the browser is not full screen.
- Forgetting that browser zoom changes the numbers.
Frequently asked questions
Why is my resolution lower than my screen’s specification?
Browsers report CSS pixels. Multiply by the pixel ratio to get physical pixels.
What is the device pixel ratio?
The number of physical pixels for each CSS pixel. 2 and 3 are common on phones and laptops.
Why does the window size change?
It follows the browser window, so zooming, rotating or resizing changes it.
Is anything sent anywhere?
No. The values are read in your browser and not sent.
Related tools
Details
- Browser window
- 1280 × 900 px
- Available screen area
- 1280 × 900 px
- Device pixel ratio
- 1
- Colour depth
- 24-bit
- Orientation
- landscape
- Touch points
- 0
- Aspect ratio
- 64:45