Teaspoons to Milliliters Converter. Enter a volume in teaspoons (tsp) and this Teaspoons to Milliliters Converter calculates the equivalent in milliliters (mL). Choose between US teaspoons (4.928922 mL each) or metric teaspoons (5 mL each) to get the precise conversion you need for cooking, recipes, or lab measurements. Also try the Grams to Tablespoons Converter Calculator.
Milliliters
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Milliliters (Rounded)
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To convert US teaspoons to milliliters, multiply the number of teaspoons by 4.928922. For metric teaspoons, multiply by 5. For example, 2 US tsp = 2 × 4.928922 = 9.857844 mL, while 2 metric tsp = 2 × 5 = 10 mL. See also our Grams to Cups Converter.
One US teaspoon equals exactly 4.928922 milliliters. One metric teaspoon equals exactly 5 milliliters. The slight difference matters in precise applications like pharmaceutical or laboratory measurements.
1 US teaspoon is equal to 4.928922 mL, and 1 metric teaspoon is equal to 5 mL. For everyday cooking, rounding to 5 mL per teaspoon is common and acceptable.
2 US teaspoons equal approximately 9.857844 mL (roughly 9.86 mL). Using the metric teaspoon, 2 tsp equals exactly 10 mL. Most recipes use the metric value of 5 mL per teaspoon.
Yes, using the metric teaspoon definition (1 tsp = 5 mL), half a teaspoon equals exactly 2.5 mL. With the US teaspoon definition, ½ tsp equals approximately 2.464461 mL, which is close enough to 2.5 mL for most cooking purposes.
A US teaspoon equals 4.928922 mL, while a metric teaspoon equals exactly 5 mL. The difference is small — less than 0.072 mL — but can matter in precise scientific or pharmaceutical contexts. For home cooking, both are treated as equivalent.
A milliliter (mL) is a unit of volume in the metric system equal to one-thousandth of a liter. It is widely used in cooking, medicine, and science. One milliliter of water has a mass of approximately 1 gram at standard temperature.
A teaspoon is a common culinary unit of volume used primarily in cooking and baking to measure small amounts of ingredients like spices, extracts, and leavening agents. It is also used in medicine to measure liquid dosages. You might also find our calculate Cups (Decimal), Cups (Fraction) & Tablespoons Entered — Tablespoons to Cups Converter useful.