Aspect Ratio Calculator
Calculate and convert aspect ratios for AI image generation, video, and photography
Results
Simplified Ratio
16:9
Decimal
1.78
Orientation
Landscape
Midjourney
--ar 16:9
Calculate Dimensions
Full resolution: 1920 × 1080
Common Aspect Ratios
AI Image Generator Presets
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What is Aspect Ratio?
Aspect ratio is the proportional relationship between an image's width and height, expressed as two numbers separated by a colon (like 16:9). It defines the shape of an image rather than its actual size.
Understanding aspect ratios is crucial for AI image generation, video production, photography, and social media content to ensure your images display correctly across different platforms.
How to Use This Tool
Choose Input Mode
Enter a ratio directly (16:9) or enter pixel dimensions (1920×1080) to calculate the ratio.
Use Quick Presets
Click common ratios or AI generator presets to quickly apply standard dimensions.
Calculate Dimensions
Enter a target width to automatically calculate the corresponding height for your ratio.
Copy for AI Tools
Copy the Midjourney parameter (--ar) directly to use in your image generation prompts.
Common Aspect Ratios Reference
| Ratio | Decimal | Common Uses |
|---|---|---|
| 16:9 | 1.78 | HD Video, YouTube, TV |
| 1:1 | 1.00 | Instagram Posts, Profile Photos |
| 4:5 | 0.80 | Instagram Portrait, Facebook |
| 9:16 | 0.56 | Instagram Stories, TikTok, Reels |
| 21:9 | 2.33 | Cinematic, Ultrawide Monitors |
Pro Tip: Midjourney Aspect Ratios
Midjourney works best with common ratios like 16:9, 9:16, 4:3, and 1:1. Unusual ratios may produce unexpected cropping or composition. The --ar parameter accepts any ratio, but stick to standard ones for best results.
Frequently Asked Questions
What aspect ratio should I use for AI image generation?
For general use, 1:1 (square) works well. For landscapes, use 16:9 or 3:2. For portraits, use 9:16 or 2:3. Consider your end use case — social media platforms have specific preferred ratios.
Does aspect ratio affect image quality?
Not directly — it affects shape, not resolution. However, extreme ratios (like 21:9) may have different quality characteristics than standard ratios in some AI generators.
What's the best ratio for Instagram?
For feed posts: 1:1 (square) or 4:5 (portrait). For Stories and Reels: 9:16 (vertical). For carousel images, 1:1 is safest as it works well on all screen sizes.
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