Aspect ratio guides
Short, practical explainers to help you choose the right proportions and dimensions — then crunch the numbers in the calculator.
Aspect ratios explained
What 16:9, 4:3, 1:1, 9:16 and the other common ratios mean — and when to use each.
Social media image sizes
Recommended dimensions and ratios for YouTube, Instagram, TikTok, Facebook, X, LinkedIn and Pinterest.
How to calculate an aspect ratio
The simple formula, worked examples, and how to find a missing width or height.
Aspect ratio vs. resolution
Why two images can share a ratio but have very different pixel dimensions — and why it matters.
Need numbers, not theory?
Enter a width or height for any ratio and read the matching dimension instantly.
Open the calculator