Manual Entry

IF YOU RELOAD USING CTRL + F5, NOT JUST F5, THINGS WILL BREAK IF YOU DONT

Enter the values as a decimal number instead of a % (idk how to get JS to parse percents) - e.g. 1.234 instead of 123.4%
afterwards press the button on the left side; empty fields will be treated as if the modifier was "empty"
If everything is empty it will div0, at least 1 value is needed

Results

Single Rolls Rated from 0-1

Total Heirloom Rated from 0-1