Ok this is quick & dirty but ... may be close to what you need. Still need to set tick size and multiplier manually
This is a pretty good one I found online: http://evilspeculator.com/futuresRcalc/ I'm new to trading futures and its been pretty helpful.
Forex Position Size Calculator (Why So BIG?) https://www.cashbackforex.com/article/money-management https://www.cashbackforex.com/tools/position-size-calculator/AUDUSD