When you are in the middle of a formulation and you need a quick calculation it can be tricky to find the right tool
Here I've assembled a (growing) collection of tools that I, and others, have found useful.
Some calculators will be contained within Practical Formulating, some are within the other Practical Science areas. Don't worry if you get taken to one of those areas, you can easily return to here.
If there's a tool you'd like, just let me know!