Instantly calculate and convert aspect ratios. Perfect for video production, image editing, screen design, and media projects.
An aspect ratio is the proportional relationship between the width and height of an image or screen. It's expressed as two numbers separated by a colon (e.g., 16:9), or as a decimal (e.g., 1.78).
Different media formats use different aspect ratios to optimize viewing experience and content delivery.
| Ratio | Decimal | Common Use | Example |
|---|---|---|---|
| 16:9 | 1.78 | HD Video, YouTube, TV | 1920×1080 |
| 4:3 | 1.33 | Classic TV, Older Monitors | 1024×768 |
| 1:1 | 1.00 | Instagram Posts, Profile Pictures | 1000×1000 |
| 21:9 | 2.33 | Ultrawide Monitors, Cinema | 2560×1080 |
| 9:16 | 0.56 | Vertical Video, Stories, Reels | 1080×1920 |
| 3:2 | 1.50 | Photography, Tablets | 1200×800 |
Use 16:9 for HD/4K video, or 21:9 for cinematic looks
Crop images to 3:2 or 4:3 for balanced compositions
Design responsive layouts based on common screen ratios
Instagram: 1:1 posts, 9:16 stories, 3:2 carousel
Match monitor native ratio for best image quality
YouTube: 16:9 | TikTok: 9:16 | Twitch: 16:9
Formula: Aspect Ratio = Width ÷ Height
Example: A 1920×1080 image:
If you know the ratio and one dimension, calculate the other:
Example: You want a 1:1 image, 800px wide. Height = 800 ÷ (1 ÷ 1) = 800px
💡 Pro Tip: Use this calculator with our online ruler and scale converter for complete dimension control in your design projects.
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