Aspect Ratio Calculator
Find a width-to-height ratio and calculate a matching height for a new width. Use actual pixel dimensions when exact proportions matter.
Parameters
Width in any unit (pixels, inches, etc.).
Height in the same units as width.
Enter a new width to calculate the proportional height
Results
Simplified aspect ratio as a fraction
Other results (3)
Aspect ratio expressed as a decimal number
This resolution matches a known aspect ratio preset
Total pixel count: 2,073,600 pixels
Example input and result
1920 × 108016:9Aspect ratio describes proportions, not resolution. Devices marketed as 21:9 may use a different exact pixel ratio.
Why Choose Aspect Ratio Calculator
Find a width-to-height ratio and calculate a matching height for a new width. Use actual pixel dimensions when exact proportions matter.
How to Use
- 1Enter a positive width and height in the same unit.
- 2Read the simplified ratio and decimal proportion.
- 3Optionally enter a new width to calculate its matching height.
Frequently Asked Questions (FAQ)
Does a 16:9 ratio specify a resolution?
No. 1920×1080 and 1280×720 both have a 16:9 ratio but contain different numbers of pixels.
Is every ultrawide monitor exactly 21:9?
No. 3440×1440 simplifies to 43:18. Marketing labels can approximate an aspect ratio; use the actual width and height for exact calculations.
Can resizing create more image detail?
No. A ratio calculator supplies dimensions. It does not resize a file or recover detail missing from the source image.
Authoritative References & Sources
MDN — CSS aspect-ratio
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