ToolsFaction Online Tool
Aspect Ratio Calculator
Keep image and video dimensions proportional when resizing.
Calculate proportional image and video dimensions from width, height and aspect ratio online.
About This Tool
ToolsFaction Aspect Ratio Calculator preserves the proportions of an image, video or screen while calculating a new width or height. It is useful for responsive media, thumbnails and export sizing.
How to Use
- Enter the original width and height.
- Enter either a new width or new height.
- Choose which missing dimension to calculate.
- Use the proportional result for resizing.
Example
Resize a 1920 by 1080 frame to 1280 pixels wide and calculate the matching height.
Frequently Asked Questions
Does this resize an actual image?
No. It calculates proportional dimensions.
Can I calculate width from height?
Yes.
Are results rounded to whole pixels?
Yes. Calculated dimensions are rounded to whole pixels.
Can I use it for video?
Yes. The same proportional calculation applies to image and video dimensions.
Free to UseNo hidden fees
No Sign-UpStart instantly
Browser-BasedNothing to install
Privacy FriendlyBuilt for simple use