I'm using this thread to share a new CPFP calculator I made:

https://bitaccelerate.com/cpfp-calculator/

It works in a different way. Unlike others, it does not require the child transaction to be published in advance and then increase its fee through RBF. It directly calculates what fee should be used for the child transaction.

The only requirement is that the child transaction has only one input and one output for the calculations to be accurate. This is not complicated to do, and the benefits are much easier to work with when using the tool.