I happened to come across the password entropy calculation formula and started wondering how to design one for a targeted entropy level, so I created one. It can generate entropy values from 100 bits up to 100,000 bits.

Assuming Entropy = log₂(charsetSize^Length), then I used   Length = log₂(charsetSize) / minEntropy to build it.

What do you all think?

Here's the source code at https://github.com/aliceandthewonderland/TITAN-PASSWORDS