Aspect Ratio Calculator

Calculate dimensions, find ratios, or scale images perfectly. Essential for designers, photographers, and video editors.

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PX
PX
16:9
1920px
1080px
Simplest Ratio
16 : 9
Decimal Ratio
1.778
Ratio = Width / Height. Simplest ratio found using GCD (Greatest Common Divisor).

Scaling Your Vision

1

Set Dimensions

Enter your starting width and height. Our tool will instantly calculate the resulting aspect ratio.

2

Lock & Resize

Click the lock icon to maintain the ratio. Now, changing one dimension will automatically update the other.

3

Use Presets

Quickly switch between common standards like 16:9 for video, 3:2 for photos, or 1:1 for social media posts.

Understanding Aspect Ratio

Aspect ratio represents the proportional relationship between a shape's width and its height. It is commonly expressed as two numbers separated by a colon, like 16:9. Regardless of the actual size (pixels, inches, centimeters), the ratio stays the same.

Consistency
Perfect Scaling
Precision
GCD Algorithm

Designed for Professionals

Bidirectional Resizing

Lock the ratio to calculate height from width or width from height. Perfect for preparing image assets.

Smart Ratio Discovery

Automatically finds the simplest whole-number ratio (like 16:9) using a mathematically precise GCD algorithm.

Ratio FAQ

What is the aspect ratio of 1920x1080?
1920x1080 is exactly 16:9. This is the standard aspect ratio for high-definition video, monitors, and television screens.
How do I calculate a custom aspect ratio?
To find any ratio, divide the width by the height. For example, if your width is 1000 and height is 500, the ratio is 2 (or 2:1). Our tool also provides the simplest fractional form automatically.