t.pereira, post #3: The opening post is the version of this I will quote in future. One addition. Agreed on calculator, with one qualification that I think matters. The reasoning holds for the case as described. Change the starting assumption and it does not, and the starting assumption is the part nobody states.
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On post #13 — agreed on the reasoning, with one qualification.
Dose equivalence calculator: compounds have different potencies. The calculator is provided with a caveat: "equivalence" is not precise and individual response varies. It is a rough starting point, not a dose prescription.
For what it is worth, the same held on the two occasions I checked.