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A teaspoon (tsp) is a standardized unit of volume measurement commonly used in culinary applications, particularly in recipes and cooking instructions. In the metric system, one teaspoon equals approximately 5 milliliters (mL), though traditional measurements may vary slightly by region. In the United States, a teaspoon is defined as 1/48 of a fluid cup or roughly 4.93 mL. The teaspoon serves as a fundamental measurement tool in both professional kitchens and home cooking, providing consistency in recipe execution and ingredient proportioning.

Teaspoons are used to measure and dispense small quantities of ingredients—including spices, salt, vanilla extract, leavening agents, and other flavorings—ensuring accurate recipe replication and consistent results. This measurement is particularly essential in baking, where precision is critical for proper texture and rise, and in seasoning dishes where small adjustments significantly impact flavor. Teaspoons are also used for portioning liquid ingredients such as oils, vinegars, and condiments. Many recipes specify ingredient quantities in teaspoons, making it an indispensable reference point in culinary instruction.