In my Skillshare course there’s a brief moment where I show a ratio calculator that I use for doing things like figuring out dimensions of containers while designing.
The idea is simple. You have a ratio like 16:9, 4:3, 9:6, etc. and want to see how to scale another object with that ratio using a fixed dimension, e.g. you know the width.
Here are a few that I like:
Aspect Ratio Calculator, a free web calculator by Andrew Hedges that I’ve used for years.
Aspect Ratio Calculator for Mac, by David Wolf. Available via the Mac App Store for $3.99.