What Is the Teaspoons to Milliliters Converter?
This tool converts a volume measured in teaspoons (tsp) into milliliters (mL). It uses the US customary teaspoon, which is defined as exactly 4.92892159 milliliters. Milliliters are the standard metric unit of volume used worldwide in recipes, medicine dosing, and science, so converting from teaspoons makes measurements precise and universal.
How to Use It
Enter the number of teaspoons you want to convert and the calculator instantly returns the equivalent volume in milliliters. You can enter whole numbers or decimals — for example 0.5 tsp or 2.25 tsp. The result is rounded for readability while the underlying value is kept at full precision.
The Formula Explained
The conversion is a simple multiplication: $$\text{mL} = \text{Teaspoons (tsp)} \times 4.92892159$$. Because one US teaspoon equals \(4.92892159\) mL by definition, you simply scale the teaspoon count by this factor. Many everyday recipes round this to 5 mL, but this converter uses the exact value for accuracy.
Worked Example
Suppose you have 3 teaspoons of vanilla extract. Multiply $$3 \times 4.92892159 = 14.78676477 \text{ mL},$$ which rounds to about 14.79 mL. That is why three teaspoons (one tablespoon) is often labeled as roughly 15 mL.
FAQ
Is this a US or metric teaspoon? This uses the US teaspoon (\(4.92892159\) mL). A metric teaspoon is exactly 5 mL, and a UK/Imperial teaspoon is about 5.9194 mL.
How many mL is 1 teaspoon? One US teaspoon is \(4.92892159\) mL, commonly rounded to 5 mL.
Can I convert mL back to teaspoons? Yes — divide the milliliters by \(4.92892159\) to get teaspoons.
