Teach Soap

I am wanting to mix up a very invigorating batch of bath salts but not sure how to keep the total chemical constituent count in safe IFRA levels.

It occurs to me that bc eucalyptus, tea tree, & rosemary EOs are all medicinal and campherous that there might be an issue mixing them all up together, but still likely safer than just mixing one scent alone at full strength into the salts (w/a carrier, of course).

You know what I mean? Is there a magic bath salt calculator out there I can input my ingredients and it will tell me proportions to mix together safely?