Is this calculation free and private?

Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.

What does the Aspect Ratio & Dimension Scaler give me?

It works out Scaled Width, Scaled Height, Aspect Ratio and Scaling Factor, updating live as you change the inputs.

What do I need to enter?

Just Original / Base Width, Original / Base Height, Target Width and Target Height. Every field has a sensible default you can start from.

Is my data uploaded anywhere?

No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.

Does it work on a phone?

Yes. The layout adapts to small screens and needs no app or signup.

Aspect Ratio & Dimension Scaler

Scale images and video dimensions dynamically while preserving proportional aspect ratios (16:9, 4:3, 1:1, custom).

100% free
Private in browser
No signup
No watermarks

Original / Base Width (px)

Original / Base Height (px)

Target Width (px, 0 to scale from height)

Target Height (px, 0 to scale from width)

Scaled Width (px)

1,280

Scaled Height (px)

720

Aspect Ratio (Decimal W/H)

1.778

Scaling Factor (%)

66.7

Rate this tool

Be the first to rate — helps others and improves this page.

About Aspect Ratio & Dimension Scaler

Scale images and video dimensions dynamically while preserving proportional aspect ratios (16:9, 4:3, 1:1, custom). Enter Original / Base Width, Original / Base Height and Target Width and the tool works out Scaled Width, Scaled Height and Aspect Ratio straight away. Everything runs in your browser, so your data never leaves your device.

How to use Aspect Ratio & Dimension Scaler

Enter Original / Base Width, Original / Base Height and Target Width.
Adjust the remaining options (Target Height) to match your case.
Read Scaled Width, Scaled Height and Aspect Ratio in the results panel — copy or download what you need.

Key features

Shows Scaled Width (px)
Shows Scaled Height (px)
Shows Aspect Ratio (Decimal W/H)
4 adjustable inputs, results update as you type
No signup, no limits

Frequently asked questions

Is this calculation free and private?: Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.
What does the Aspect Ratio & Dimension Scaler give me?: It works out Scaled Width, Scaled Height, Aspect Ratio and Scaling Factor, updating live as you change the inputs.
What do I need to enter?: Just Original / Base Width, Original / Base Height, Target Width and Target Height. Every field has a sensible default you can start from.
Is my data uploaded anywhere?: No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
Does it work on a phone?: Yes. The layout adapts to small screens and needs no app or signup.

Related In-Depth Guides

Learn practical workflows, real-world examples, and expert tips in our comprehensive guides:

Media & Video · 5 min read

Video Bitrate & File Size Calculator Guide: Optimize Bandwidth & Storage for Streaming

How video resolution, framerate, and compression bitrates impact file size in MB/GB. Complete bitrate recommendations for 1080p, 4K, and timelapse projects.