please be careful in using these conversions unless they have been verified.
gram - a unit of mass
teaspoon/tablespoon - a unit of volume
there is no universal conversion of volume to mass. the best example is this: 1 tablespoon of ice vs. 1 tablespoon of water. both have the same volume, but if you were to weigh them out you will get very different results.
the same is true with SN. unless someone has already done the conversion by measuring out a teaspoon/tablespoon of SN and then weighing it and provided the results you should be very careful about accepting a very inexact statement such as "4-5 should be 20gs of SN"
maybe this will help explain:
https://www.gourmetsleuth.com/conversions/grams/general-gram-calculator
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