Convert Teaspoons to Milliliters – Kitchen Converter

The conversion uses the established unit relationship for a US teaspoon: 1 teaspoon (US, customary culinary) equals 4.92892159375 milliliters. This value aligns with national metrology guidance and international unit definitions.

Where other teaspoon definitions exist (for example, a metric teaspoon often defined as exactly 5 mL), the converter documents the standard used and provides guidance on when to use the metric convenience value versus the more precise US teaspoon value.

Accuracy caveats: measuring spoons and household utensils vary in manufactured tolerance, surface tension effects can alter liquid volume readings, and dense or packed solids displace differently than free-flowing liquids. For medication or regulated dosing, use calibrated medical devices and follow institutional or regulatory guidance.

Use the precise factor 4.92892159375 mL per US teaspoon for exact conversions and note the common 5 mL metric teaspoon approximation used in some recipes.

For critical applications such as medication dosing or laboratory measurement, use calibrated devices and follow NIST, ISO, and applicable regulatory guidance.

1 teaspoon × 4.92892159375 = 4.92892159375 mL (commonly rounded to 4.93 mL)

2 teaspoons × 4.92892159375 = 9.8578431875 mL (commonly rounded to 9.86 mL)

1/2 teaspoon × 4.92892159375 = 2.464460796875 mL (commonly rounded to 2.46 mL)