⚙ Tool

Aspect Ratio
Calculator

resize · scale · preview · convert

Dimensions

×
🔒 Lock aspect ratio
—
Aspect Ratio

Preview

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Enter dimensions
Decimal Ratio
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📋
✓ Copied!
Simplified
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📋
✓ Copied!
Width %
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📋
✓ Copied!
Total Pixels
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📋
✓ Copied!

Scale to New Size

→
Enter a new width or height above
to calculate the proportional dimension

Common Standard Sizes

Name Dimensions Ratio Match
Built for Westcrest Media · All calculations run in-browser

Simple Process

How It Works

01

Enter Dimensions

Type your width and height | or pick a preset like 16:9, 1:1, or 9:16 to auto-fill instantly.

02

See Results Instantly

Get the simplified ratio, decimal value, width percentage, total pixels, and a live visual preview | all updated in real time.

03

Scale to Any Size

Use the Scale Calculator to find the correct width or height for any new size, keeping your ratio perfectly locked.

Questions

Frequently Asked

What is an aspect ratio?
An aspect ratio is the proportional relationship between a frame's width and height, expressed as two numbers separated by a colon (e.g. 16:9). It defines the shape of the image regardless of its actual pixel size.
What aspect ratio should I use for YouTube?
YouTube recommends 16:9 for standard videos (1920×1080 or 3840×2160 for 4K). For Shorts, use 9:16 (1080×1920). Use the presets above to auto-fill these values instantly.
How do I keep the same ratio when resizing?
Enable the "Lock aspect ratio" toggle, then change either the width or height | the other dimension will update automatically to maintain your ratio. Or use the Scale Calculator for any target size.
What's the difference between 16:9 and 1.78:1?
They're the same ratio expressed differently. 16:9 is the simplified whole-number form, while 1.78:1 (or 1.7778) is the decimal equivalent. This tool shows both | use whichever your software requires.