Aspect Ratio Calculator

Calculate aspect ratios and convert resolutions. Find the matching width or height for 16:9, 4:3, and custom ratios. Free online aspect ratio calculator.

Frequently Asked Questions

What is the most common aspect ratio?
16:9 is the most widely used aspect ratio today, adopted by most monitors, TVs, and smartphones. Other common ratios include 4:3, 21:9, and 1:1.
Can I find the height if I only know the width?
Yes, enter the desired ratio and width, and the calculator will automatically compute the corresponding height. The reverse also works.
Why does aspect ratio matter for video editing?
Exporting video in the wrong aspect ratio can cause letterboxing (black bars) or image distortion. Matching the platform's expected ratio is essential.
2026 device specs