And 100% of the combos you want to be female are male, yup.
I know this thread is probably done, but if a recessive trait is valuable enough they will track the 25%s and such. Albino gtps were the last ones I remember seeing. So it does happen in an acceptable way, but rarely and I’ve never seen it with bps. But if you’re dealing with animals like that, you shouldn’t need a calculator to tell you what’s up.
With that said unless it’s that rare case, it would be seen as a marketing ploy and perceived as a bad thing to even list.
As far as the calc is concerned, I think it would be more clutter than useful and potentially confusing depending on the typos someone types in. I can’t see it being a good thing to put in.