How to calculate aspect ratio
- Enter original width and height or select a preset.
- Calculate the simplified ratio.
- Type one new dimension to generate the other proportionally.
Aspect Ratio Calculator
Find a simplified width-to-height ratio and calculate new proportional dimensions.
Your ratio will appear here.
Resize proportionally
FAQ
What is 16:9 used for?
It is a common widescreen ratio for video, displays and presentation slides.
Can I use decimals?
Use whole pixel dimensions for the clearest simplified ratio.
Related tools
Aspect ratio and proportional resizing
An aspect ratio describes width relative to height, such as 16:9 or 4:3. Keeping that ratio prevents stretching when an image, video or design is resized.
Enter original dimensions to simplify the ratio, then provide either a new width or height to calculate its matching dimension. Small rounding differences of one pixel are normal.
Helpful questions
What does 16:9 mean?
For every 16 units of width, the frame has 9 units of height.
Does resizing change file size?
This calculator only supplies dimensions; use Image Resizer to create a new file.
Why is my ratio rounded?
Whole-pixel output may require a small rounding adjustment.