A tablespoon is a unit of measurement for volume. The most common way to measure a tablespoon is by using a ruler, which would show that a tablespoon is approximately 3 teaspoons or 1/16 of a cup. However, there are many different sizes of tablespoons available on the market, so it's important to know how to properly measure one.
When measuring an accurate tablespoon, the best way to do so is by using a food scale. This will give you the most accurate measurement of your ingredient. To measure 75% of a tablespoon, simply place your food scale on top of a dry measuring cup and tare it to zero. Add your ingredient until you reach the desired amount. In this case, you would add your ingredient until you reach .75 ounces or 21 grams.