How is the simplified ratio calculated?

The width and height are divided by their greatest common divisor (GCD) to produce the simplest whole-number ratio, like 1920×1080 simplifying to 16:9.

Can I scale by height instead of width?

Yes, entering a target height calculates the matching width, and vice versa — only one is editable at a time to keep the ratio locked.

Is my data uploaded anywhere?

No, all calculations happen entirely in your browser.

What does the simplified ratio (e.g. 16:9) mean?

It's your width and height reduced to the smallest whole numbers that keep the same proportion, using their greatest common divisor.

Can I lock the ratio and enter a target width to find the height?

Yes, entering either dimension automatically scales the other to preserve the original aspect ratio.

Is this useful for video and screen resolutions too?

Yes, it works for any width/height pair — video frames, monitor resolutions, print dimensions, and image crops all use the same ratio math.

What's the difference between aspect ratio and resolution?

Resolution is the exact pixel dimensions (e.g. 1920×1080); aspect ratio is the proportional relationship between width and height (e.g. 16:9), which many different resolutions can share.

Processed 100% locally in your browser

Aspect Ratio & Dimension Calculator

Calculate a scaled width or height that preserves your original aspect ratio.

Quick Answer

Aspect Ratio & Dimension Calculator lets you: Calculate a scaled width or height that preserves your original aspect ratio. To start, input the original width and height.

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How to use this tool

1
Enter your original dimensions
Input the original width and height.
2
Enter a target dimension
Enter either a target width or height — the other updates automatically to preserve the ratio.
3
Use a preset if needed
Click a common ratio preset like 16:9 or 1:1 to apply it instantly.

Frequently Asked Questions

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Image Resizer

Resize images to exact pixel dimensions with optional aspect ratio lock — processed 100% locally.

Aspect Ratio & Dimension Calculator

How to use this tool

Enter your original dimensions

Enter a target dimension

Use a preset if needed

Frequently Asked Questions

How is the simplified ratio calculated?

Can I scale by height instead of width?

Is my data uploaded anywhere?

What does the simplified ratio (e.g. 16:9) mean?

Can I lock the ratio and enter a target width to find the height?

Is this useful for video and screen resolutions too?

What's the difference between aspect ratio and resolution?

Related Tools

Unit Converter

Image Resizer

Aspect Ratio & Dimension Calculator

How to use this tool

Enter your original dimensions

Enter a target dimension

Use a preset if needed

Frequently Asked Questions

How is the simplified ratio calculated?

Can I scale by height instead of width?

Is my data uploaded anywhere?

What does the simplified ratio (e.g. 16:9) mean?

Can I lock the ratio and enter a target width to find the height?

Is this useful for video and screen resolutions too?

What's the difference between aspect ratio and resolution?

Related Tools

Unit Converter

Image Resizer