What is the conversion of 1 teaspoon in milliliters?

The correct conversion of 1 teaspoon to milliliters is 15 mL. This measurement is widely recognized in both culinary and pharmacological contexts. In many standard conversions, especially in medicine and pharmacy, knowing that 1 teaspoon equals approximately 5 milliliters is essential when dosing liquid medications or compounding mixtures.

While the other options present various measurements of milliliters, the accurate conversion aligns with the established metric system, which indicates that 1 teaspoon is equivalent to about 5 mL. In pharmacy practice, precise measurements ensure the safety and efficacy of medication administration. Thus, understanding this conversion supports practitioners in accurately preparing and dispensing medications.