Aspect Ratio Calculator: Find Perfect Proportions
Calculate the aspect ratio of an image or video with this simple calculator.
Aspect Ratio Calculator
Whether you're resizing images for social media, setting up a presentation, or calibrating a display, knowing the correct aspect ratio is crucial. An aspect ratio calculator helps you find the perfect proportions for any visual content.
What is Aspect Ratio?
Aspect ratio is the proportional relationship between width and height, expressed as two numbers separated by a colon (e.g., 16:9, 4:3, 1:1).
Common Aspect Ratios
16:9: Standard widescreen format. Used for most modern TVs, YouTube, and streaming.
4:3: Traditional TV and computer monitor format. Still used in some presentations.
1:1: Square format. Popular on Instagram and social media profiles.
21:9: Ultra-wide format. Used in cinematic content and gaming monitors.
3:2: Classic photography ratio. Common in DSLR cameras.
How to Calculate
The calculator uses the Greatest Common Divisor (GCD) to simplify the ratio. For example:
- 1920 × 1080 → GCD is 120 → Simplified: 16:9
- 1280 × 720 → GCD is 80 → Simplified: 16:9
Tips for Choosing
- Match your content to the platform's preferred ratio
- Consider your audience's viewing devices
- For video, 16:9 is the safest default choice
- For Instagram posts, 1:1 or 4:5 tend to perform best