Aspect Ratio Calculator: Perfect Proportions

The Aspect Ratio Calculator is a free tool that helps you calculate, convert, and preserve the proportions of your images and videos. Essential for designers, video editors, and web developers.

Enter your dimensions, lock the ratio, and resize freely while maintaining the exact proportions of your content.

How to Use

Enter the width and height of your content
The ratio displays automatically (e.g., 16:9)
Lock the ratio to maintain proportions
Change one dimension, the other adjusts automatically
Use presets for common formats

Common Aspect Ratios

16:9

HD/4K standard for videos and modern displays.

Examples: 1920×1080, 3840×2160

4:3

Classic format for presentations and photos.

Examples: 1024×768, 800×600

1:1

Square format for Instagram and profiles.

Examples: 1080×1080, 500×500

21:9

Ultra-wide for cinema and gaming monitors.

Examples: 2560×1080, 3440×1440

9:16

Vertical format for TikTok, Reels, Stories.

Examples: 1080×1920, 720×1280

3:2

Standard photo format (DSLR cameras).

Examples: 1200×800, 1800×1200

Use Cases

🎬

Video Editing

Convert your footage between different formats without distortion.

📱

Social Media

Adapt your visuals to different platforms (Stories, Posts, Covers).

🖼️

Photo Editing

Crop your images while maintaining the correct proportions.

💻

Web Development

Calculate responsive dimensions for your images and videos.

Understanding Aspect Ratios

Ratio: The relationship between width and height, expressed as X:Y.
GCD: The simplified ratio uses the Greatest Common Divisor (1920:1080 → 16:9).
Preservation: Locking the ratio prevents distortion when resizing.
Letterboxing: Black bars added when source ratio differs from destination.

Calculation Formulas

Ratio: Width ÷ Height = decimal ratio (e.g., 1920÷1080 = 1.78)

New width: Height × Ratio = Width

New height: Width ÷ Ratio = Height

GCD: Euclidean algorithm to simplify the ratio

Aspect Ratio Calculator