Calculators
Aspect ratio calculator
Find the aspect ratio of any size and resize while keeping proportions.
Free to use · Runs in your browser · No signup
This tool works in your browser. Enable JavaScript to select files and create your download.
How to use Aspect ratio calculator
- Enter the original width and height.
- Read the simplified ratio, such as 16:9.
- Enter a new width or height to get the matching dimension.
What you need
Nothing to upload. Type or paste directly into the tool; results update as you go.
Your result
The aspect ratio and resized dimensions.
Before you start
Ratios are simplified to whole numbers. Resized dimensions may include decimals; round them for pixel sizes.
Questions about Aspect ratio calculator
How do I use Aspect ratio calculator?
Enter the original width and height. Read the simplified ratio, such as 16:9. Enter a new width or height to get the matching dimension.
What does Aspect ratio calculator produce?
The aspect ratio and resized dimensions.
What should I check before using Aspect ratio calculator?
Ratios are simplified to whole numbers. Resized dimensions may include decimals; round them for pixel sizes.
Is what I type sent anywhere?
No. The calculation runs in your browser, and the text or numbers you enter are not uploaded or stored.