The most effective and accurate way to find the actual weights for your ingredients is for YOU to portion out each ingredient three times into a suitably sized container, do this for each ingredient, then weigh each container and subtract the tare, now you have 3X the ingredient weight. Divide this by 3 and you now have the average weight for each of your ingredients which can now be converted into bakers%. I just finished writing a column for In Lehmann’s Terms on this very topic. Note: I emphasized “you” above since there is some variance in the way each of us volumetrically portions ingredients, by having you do this personally you have taken a step to further eliminate any error in the conversion. The reason for doing it three times is to further reduce the scaling error/variability common to volumetric portions.
Tom Lehmann/The Dough Doctor