Aspect Ratio Calculator
The simplest way to calculate pixel-perfect dimensions for web and social media projects.
Powerful Aspect Ratio Calculator for Designers
- ✔ Identify ratios for any width and height instantly.
- ✔ Calculate missing dimensions based on target aspect ratios.
- ✔ Built-in presets for Instagram, TikTok, YouTube, and X.
- ✔ Real-time visual preview of the calculated shape.
- ✔ Copy results with a single click for your design files.
Why privacy matters.
Unlike other converters, SmolPixel processes everything in your browser's memory. Your sensitive images never touch a server.
Learn about our tech →How it works.
Select Mode
Choose between finding a ratio from dimensions or calculating a dimension from a ratio.
Enter Values
Input your width, height, or target ratio (e.g., 16:9).
Get Result
Our tool calculates the precise values instantly in your browser's memory.
Frequently Asked Questions
What is an aspect ratio?
An aspect ratio is the proportional relationship between its width and its height. It is commonly expressed as two numbers separated by a colon, such as 16:9.
What is the best aspect ratio for Instagram?
Instagram recommends 4:5 for feed posts, 9:16 for Stories/Reels, and 1:1 for square posts.
Does this tool store my data?
No. SmolPixel is 100% browser-based. All calculations happen on your local machine.