How many milliliters are in a teaspoon?

One US teaspoon equals 4.92892 milliliters, so dividing milliliters by 4.92892 gives teaspoons.

Is this the US or metric teaspoon?

This converter uses the US teaspoon (4.92892 mL). A metric teaspoon is exactly 5 mL, very close but not identical.

How many teaspoons is 5 mL?

5 mL ÷ 4.92892 = 1.014 US teaspoons, so 5 mL is essentially one teaspoon. This is why many medicine doses round 5 mL to '1 tsp'.

How do I convert teaspoons back to mL?

Multiply by 4.92892. For example, 2 tsp × 4.92892 = 9.86 mL. The converter does this automatically when you type in the teaspoons field.

How many teaspoons are in a tablespoon?

Exactly 3. A US tablespoon equals three US teaspoons, so 1 tbsp = 14.78676 mL = 3 tsp.

Is anything uploaded?

No — every conversion runs in your browser and nothing is sent to any server.

Milliliters to Teaspoons Converter

This converter changes milliliters (mL) into US teaspoons (tsp) and back again, updating live as you type. It is handy for cooking and liquid medicine doses that mix metric millilitres and teaspoons.

How it works

A US teaspoon is defined as exactly 4.92892159375 mL, so the converter uses that fixed factor:

tsp = mL ÷ 4.92892
mL = tsp × 4.92892

The relationship is linear and bidirectional — type in either field and the other updates instantly. Note this is the US teaspoon; a metric teaspoon is exactly 5 mL, very close but not identical.

Example

A cough syrup dose is 10 mL and you want it in teaspoons.

10 ÷ 4.92892 = 2.03 tsp, so about two teaspoons.

Milliliters (mL)	US teaspoons (tsp)
5 mL	1.014 tsp
10 mL	2.029 tsp
15 mL	3.043 tsp
30 mL	6.086 tsp

All calculations run entirely in your browser, with no data ever uploaded.