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US teaspoons to milliliters (tsp to ml)

To convert US teaspoons to milliliters (tsp to ml): one US teaspoon is 4.9289216 milliliters, so 3 tsp is 14.7868 ml.

Notice: Not for measuring or calculating medication. Incorrect dosing can cause serious injury. Use the dosing device supplied with the medication and follow the label or the directions of a pharmacist or physician.

In milliliters14.7868 ml

Conversion factor Exact by definition. The inch has been exactly 2.54 cm and the pound exactly 0.45359237 kg since the 1959 international yard and pound agreement, so these are not measurements that can drift.
1 US teaspoon = 4.928921594 milliliters
The other way
1 milliliter = 0.2028841362 US teaspoons
Working
3 x 4.928921594 = 14.7868
3 tsp in every unit
14.787 ml 0.014787 L 3 tsp 1 tbsp 0.5 fl oz 0.0625 cup 0.03125 pt 0.015625 qt 0.0039063 gal 0.0032526 imp gal 0.00052219 cu ft 0.00001934 cu yd 0.000014787 m3
US teaspoons to milliliters
tspml
14.92892
29.85784
524.6446
1049.2892
25123.223
50246.446
100492.892

How the Unit Converter works

One US teaspoon is 4.928921594 milliliters. Both units are defined against the same SI base unit, so the factor is derived from two exact definitions rather than measured. It is exact in principle and does not land on a round number.

Worked through: 2 tsp x 4.92892159 = 9.85784 ml.

Going the other way, one milliliter is 0.2028841362 US teaspoons.

To convert without a calculator, multiply by 4.929. Rounding that to 4.9 is within 0.59% for most purposes.

A US teaspoon is 4.93 ml and is routinely rounded to 5, which is within any cooking tolerance. Kitchen teaspoons vary considerably in the volume they actually hold, which is why instruments intended for precise volumes are graduated in milliliters.

Precision is worth matching to the input. A measurement given as 0.25 tsp carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.

Unit Converter FAQ

How many milliliters are in a US teaspoon?

4.9289216. The factor is derived from the definitions of both units against the same SI base, so it is exact in principle but not a round number.

What is 3 tsp in milliliters?

14.7868 ml. Multiply by 4.9289216: 2 tsp x 4.92892159 = 9.85784 ml.

How do I convert milliliters back to US teaspoons?

Divide by 4.9289216, or equivalently multiply by 0.20288414. One milliliter is 0.20288414 US teaspoons. The two factors are reciprocals, so you only need to remember one of them.

Is there anything to watch out for with this conversion?

A US teaspoon is 4.93 ml and is routinely rounded to 5, which is within any cooking tolerance. Kitchen teaspoons vary considerably in the volume they actually hold, which is why instruments intended for precise volumes are graduated in milliliters.

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