Aspect Ratio Calculator
Calculate aspect ratios from pixel dimensions. Convert between common ratios for video, photography, and design. Visual preview included.
Frequently asked questions
What is an aspect ratio?
An aspect ratio is the proportional relationship between width and height, written as two numbers like 16:9. It describes the shape, not the size, so 1280x720 and 1920x1080 share the same 16:9 ratio.
Why does aspect ratio matter?
Matching the right ratio keeps your content from being stretched, squished or cropped. Video, social posts and print all expect specific ratios, so designing to the correct one avoids black bars and awkward crops.
How do I calculate an aspect ratio manually?
Divide the width and height by their greatest common divisor. For 1920x1080 both divide by 120 to give 16:9. This calculator does it instantly and can resize while keeping the ratio locked.
What aspect ratio should I use for social media?
Common choices are 1:1 for feed posts, 4:5 for portrait feed, 9:16 for Stories and Reels, and 16:9 for YouTube. Enter one dimension here and the tool fills in the other.
Just getting started? Try a free course
Beginner-friendly courses in Blender, Photoshop, Figma, Canva and Claude - free.
Level up your skills
Explore in-depth courses in design, business, and freelancing.
Browse all courses