Bingo. PoB's gone from UG, but a new member over there just posted this calculator: https://www.steroidplotter.com When you click the link, it turns out it's someone who acknowledges the old site disappeared but is hosting it at that url. I haven't had time yet to check the 2 calculators to see if their numbers as to peaks and troughs match. At first glance the old extinct-but-born-again one looks a little more user-friendly to me.
Flip-flopping here to say the original calculator suggested by Mac may give a better visual of seeing what's happening with one of those high Test blends involving 2 or 3 esters of Test or the Tren blends involving 3 esters we sometimes see.
The calculator I attribute to PoB that just got revisited on the other board at a new url may give a better visual when you run 2 or more entirely different compounds, like a Test-Deca cycle, or the usual 3 compound cutter.