Quick Answer
A kitchen measurement chart gives you fast unit relationships when you need a quick check while cooking. It is most useful for cup, spoon, and liquid volume relationships, but it can also help when you need to distinguish volume units from weight units before converting.
The key rule is simple: volume units and weight units are not interchangeable on their own. A cup, tablespoon, teaspoon, pint, quart, and gallon measure volume. A gram, ounce, and pound measure mass or weight. If a recipe moves between those categories, ingredient density matters.