What is Aspect Ratio Calculator?
The Aspect Ratio Calculator helps you find the missing dimension of an image or video while maintaining a specific aspect ratio. An aspect ratio is the proportional relationship between the width and height of a display or image (e.g., 16:9 for HD video). If you know the width and the ratio, this tool calculates the height, and vice versa. It's crucial for resizing content without distortion.
Input Formats
- Width (px)
- Height (px)
- Ratio (W:H)
Output Results
- Missing dimension
- Visual preview box
Key Features
Ratio Presets: Quick access to 16:9, 4:3, 21:9, 1:1, and more
Missing Dimension: Calculate exact Width or Height instantly
Custom Ratios: Enter any custom aspect ratio (e.g., 2.35:1)
Privacy: 100% Client-side processing
Visual Preview: See a box representing the calculated shape
Video Editing: Essential for resizing footage without distortion
Web Design: Calculate responsive image dimensions easily
Best & Simple: The best simple aspect ratio calculator for video
Shareable LinksShare the calculation. (Limit: 1KB)
Who is this for?
Video Editing
Calculating the correct resolution for a 16:9 project.
Video resolution16:9 calcCinema ratio
Web Design
Determining image dimensions for responsive layouts.
Responsive imageCSS aspect-ratioLayout design
Photography
Cropping photos to standard print sizes like 4:6 or 5:7.
Print sizePhoto cropStandard ratio
How to Use
1
Enter the known width or height.
2
Select a preset ratio or enter a custom one.
3
The missing dimension is calculated automatically.
Frequently Asked Questions
What is 16:9?
It's the standard widescreen shape for TVs, YouTube, and most laptops.
How do I calculate aspect ratio from dimensions?
Divide width by height. 1920 / 1080 = 1.77, which is 16:9.
What is the Golden Ratio?
It's about 1.618. Artists use it because it looks naturally pleasing to the eye.
Can I use decimals?
Yes, I handle precise decimal calculations easily.
Is it useful for Instagram?
Yes! Check if your photo is 4:5 (portrait) or 1:1 (square) before you post.
Does it resize images?
No, I just do the math. Use my Image Resizer tool to actually change the image.
Is it free?
Yes, totally free.