We take an active interest in calculators as tools to save people time and to help them to be self-sufficient.
It is important that calculators give the right answers. Not always easy to do as the subjects are sometimes very complex and designers of calculators leave out difficult things on occasions.
We have not reviewed the calculators in detail, but from what we know, they are the best in their fields on the internet at the moment. As we said above, this does not guarantee complete accuracy.