My usual masterbatch is enough for about 4 loaves. The last bit always causes me consternation. The remaining amount of lye-liquid is the determining amount so I start with that. But the calculators separate out the lye and liquid. So I keep having to go backwards and tweak the superfat or tweak the amount of oils, recalculate, etc., etc. I do tend to overcomplicate things so please hit me up if you have advice on using leftovers. Thanks!