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Cooking measurements (cups, tablespoons, teaspoons, fluid ounces, pints, quarts, gallons) use the US customary standard — the same one used in most American recipes. UK, Australian, and Imperial measuring cups are defined slightly differently.
About these units
In US customary cooking measurements, 3 teaspoons make 1 tablespoon, and 16 tablespoons make 1 cup — that ladder of exact ratios is what every conversion on this page is built from, anchored to 1 US cup = 236.588 milliliters.