Aspect Ratio Calculator
Calculate, simplify, and convert aspect ratios. Find the missing dimension when scaling images or videos while maintaining the correct ratio.
Most current tools process data directly in your browser. If a tool requires external processing, it will say so clearly.
How to Calculate Aspect Ratio
- 1Enter the width and height of your image or video
- 2The simplified aspect ratio is calculated instantly
- 3Enter a new width to find the corresponding height
- 4Or enter a new height to find the corresponding width
Key Benefits
- Automatically simplifies ratios (e.g., 1920:1080 → 16:9)
- Calculate missing dimensions for scaling
- Shows common ratio names (16:9, 4:3, etc.)
- Useful for responsive images and video thumbnails
Frequently Asked Questions
What is an aspect ratio?
An aspect ratio describes the proportional relationship between width and height. For example, 16:9 means the width is 16 units for every 9 units of height.
What are common aspect ratios?
16:9 is standard for HD video and widescreen monitors. 4:3 was standard for older TVs. 1:1 is square (common on Instagram). 9:16 is portrait mobile video.
How do I maintain aspect ratio when resizing?
Enter the original dimensions to get the ratio, then enter the new width or height to calculate the other dimension automatically.