Aspect Ratio Calculator
Calculate aspect ratios and resize dimensions while keeping proportions.
The Aspect Ratio Calculator determines the aspect ratio of any dimensions and scales them proportionally. Enter a width and height to find the ratio, or lock a ratio and calculate missing dimensions. Essential for designers, video editors, and developers working with responsive media.
What This Tool Does
Aspect ratios define the proportional relationship between width and height. Getting them wrong means stretched images, cropped videos, or layouts that break on different screens. This tool calculates aspect ratios from any dimensions, simplifies them to standard formats (16:9, 4:3, etc.), and lets you scale dimensions while maintaining the ratio. Enter width and height to find the ratio. Or lock a ratio and enter one dimension to calculate the other. It handles common screen, video, print, and social media aspect ratios.
Why Use This Tool
Wrong aspect ratios mean stretched images, squished videos, and broken layouts. When resizing media, you need to maintain proportional dimensions to avoid distortion. This tool calculates the exact ratio from any dimensions and lets you scale while keeping proportions locked. It is essential for responsive web design, video production, social media content creation, and print layout. Instead of guessing or doing manual division, enter your dimensions and get the answer instantly.
How to Use
- Enter the width and height in pixels or any unit.
- The tool calculates and displays the aspect ratio instantly.
- To scale, lock the ratio and change one dimension - the other updates automatically.
- Use preset buttons for common ratios like 16:9, 4:3, 1:1.
Common Use Cases
- Finding the aspect ratio of an image or video
- Scaling images proportionally for responsive design
- Calculating dimensions for social media image sizes
- Determining correct video dimensions for different platforms
- Checking aspect ratios for print layouts
Example
Tips
- Use the preset buttons for standard ratios (16:9, 4:3, 1:1) to quickly calculate dimensions
- Lock the ratio and change one dimension to get proportional scaling without distortion
- Common social media sizes: Instagram square (1:1), Instagram story (9:16), YouTube thumbnail (16:9)
Frequently Asked Questions
What common aspect ratios does it support?
16:9 (widescreen), 4:3 (standard), 1:1 (square), 21:9 (ultrawide), 9:16 (vertical video), and more.
Can I calculate one dimension from the other?
Yes. Lock the aspect ratio and enter either width or height - the tool calculates the missing dimension.
Is it free?
Yes, completely free with no sign-up.
Does it work for print?
Yes. Aspect ratios are dimensionless, so the tool works for pixels, inches, centimeters, or any unit.
Is my data private?
Yes. All calculations happen in your browser. Nothing is sent to any server.