Converters

Teaspoons to Milliliters Converter

Convert teaspoons to milliliters instantly. 1 tsp = 4.92892 ml.

Enter a value above to see the conversion.

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Teaspoons to Milliliters Formula

The conversion from teaspoons to milliliters uses a fixed mathematical relationship.

ml = tsp × 4.92892

Example: 3 tsp × 4.92892 = 14.787 ml

About the Teaspoons to Milliliters Conversion

The teaspoon is a common volume unit in US cooking and medicine. When following an American recipe or dosing instruction that lists teaspoons, converting to milliliters allows you to use a metric measuring jug or syringe. One US teaspoon equals 4.92892 ml — close enough to 5 ml that most practical measurements treat them as equal.

Key benchmarks: 1 tsp = 4.93 ml, 1 tablespoon (3 tsp) = 14.79 ml ≈ 15 ml, and 1 US cup (48 tsp) = 236.6 ml. For cooking, rounding 1 tsp to 5 ml introduces less than 1.5% error, which is acceptable when measuring spices, extracts, and leavening agents.

Frequently asked questions

How many ml is one teaspoon?
One US teaspoon equals exactly 4.92892 ml. For practical cooking and medicine purposes, 5 ml is commonly used as a rounded equivalent — accurate to within about 1.4% — and is the standard assumption on most pharmacy measuring spoons.
How many ml is 2 teaspoons?
2 teaspoons equals approximately 9.858 ml (2 × 4.92892 = 9.858). This is a common liquid medication dose — many cold syrups and antacids instruct patients to take 2 teaspoons (approximately 10 ml) per dose.
How many ml is a tablespoon?
One US tablespoon equals 3 teaspoons, or approximately 14.787 ml (3 × 4.92892). In metric cooking, a tablespoon is rounded to 15 ml, which slightly overestimates the true value but keeps recipe measurements simple and practical.
How many teaspoons is 20 ml?
20 ml equals approximately 4.06 teaspoons (20 ÷ 4.92892 ≈ 4.06). In practice, 20 ml is often described as 4 teaspoons in dosing charts, accepting the small rounding difference for ease of measurement at home.
What is the difference between a US teaspoon and a metric teaspoon?
A US teaspoon equals 4.92892 ml, while a metric teaspoon is defined as exactly 5 ml. The difference is about 0.071 ml — less than 1.5% — which is negligible for cooking and medicine. Modern recipes and dosing guides often use 5 ml as a universal teaspoon standard.

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