The US liquid quart equals 946 millilitres — 2 pints or 1/4 US gallon. The UK imperial quart (1.137 L) is larger, like the other UK liquid units. Quarts are used in US cooking recipes and for motor-oil bottles.
Real-world: A US quart of motor oil is 946 ml. A "quart of milk" in the US ≈ 1 L. UK "quart" is rare today.
Read full quart reference →The teaspoon equals 4.929 ml in the US, rounded to 5 ml in most recipes and on medication labels. The relationship 3 teaspoons = 1 tablespoon is universal across US, UK and metric systems. Precision medicine and small-volume cooking rely on teaspoons.
Real-world: 1 teaspoon of sugar = 4 g = 16 calories. Salt in a recipe often ½ to 1 tsp per 500 g food.
Read full teaspoon reference →