Free Aspect Ratio Calculator
Calculate aspect ratios for images and video with our free tool. Convert between ratios and get social media presets.
- Calculate ratio from dimensions
- Calculate dimensions from ratio
- Common format presets
- Social media size references
- Reduce ratios to simplest form
Frequently Asked Questions
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 means 16 units wide for every 9 units tall).
What aspect ratio should I use for YouTube videos?
YouTube standard is 16:9 (1920x1080 for HD, 3840x2160 for 4K). Shorts use 9:16 vertical format.
How do I maintain aspect ratio when resizing?
Multiply or divide both dimensions by the same number. For example, 1920x1080 (16:9) resized to 50% becomes 960x540, still 16:9.