Current and target ratio
Run the test to see a visual synchronized with the current result.
Screen Aspect Ratio Calculator
Enter a screen width and height to calculate the current aspect ratio, or compare dimensions against a target ratio.
Settings
Enter a valid value.
Enter a valid value.
Enter a valid value.
Enter a valid value.
Enter a valid value.
Current conditions
Ready to run the check.
Simplified ratio—Ready to run the check.
- Simplified ratio
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- Decimal ratio
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- Size calculation
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The result is calculated from the current width, height, and unit inputs; scaling, cropping, and pixel shape can also affect the displayed ratio.
Ratio visual
Learn more
Use and interpret
Set the visible conditions, run the check, and read the primary value together with the supporting measurements. Keep viewing distance and room lighting stable when comparing results.
Method and validation
The page uses browser APIs or the stated formula to produce a repeatable observation. It reports what the browser can expose and does not infer hidden hardware behavior.
Invalid or incomplete inputs are stopped before the result is updated. Recheck unusual values with the limits shown beside each field.
Scope and limitations
A browser page can only observe the current environment and declared inputs. Color management, scaling, viewing angle, lighting, device firmware, and panel behavior can change what you see.
What aspect ratio is 1920×1080?
1920×1080 simplifies to 16:9.
How do I calculate height from a 16:9 width?
Multiply the width by 9 and divide by 16.
Why can the visible ratio differ from the resolution?
Cropping, stretching, black bars, or non-square pixels can change the displayed result.
Privacy and implementation
This tool runs in the browser. It does not upload input, call a remote API, or write to local storage.
The page uses standalone HTML, CSS, and JavaScript without a third-party runtime library.