Using a kitchen scale, weigh the ingredient. Your kitchen scale may include an option to measure in ounces or grams. Make sure that ounces is selected.
Multiply the weight from step one by two. This resulting number is the number of tablespoons.
Although this equivalency is a standard rule of thumb, some ingredients are exceptions to the rule, because ounces are a measure of weight or mass, and tablespoons are a measure of volume. There are many charts online which show equivalencies for a variety of specific ingredients. If you have doubts about your conversion, check it against a conversion chart.