The short answer
- 1 tsp ≈ 4.928922 mL
- 1 mL ≈ 0.2028841 tsp
Worked example1 tsp × 4.928921594 = 4.928922 mL
UNIT CONVERSION
← Volume converterUS teaspoons to millilitres
To convert US teaspoons to millilitres, multiply the number of US teaspoons by 4.928921594.
What the units mean
Us teaspoon. The US teaspoon is a third of a US tablespoon, about 4.93 mL. The metric teaspoon is 5 mL.
Millilitre. The millilitre is one thousandth of a litre, the same volume as one cubic centimetre.
US teaspoons to millilitres table
| Us teaspoons (tsp) | Millilitres (mL) |
|---|---|
| 0.125 | 0.6161152 |
| 0.25 | 1.23223 |
| 0.5 | 2.464461 |
| 0.75 | 3.696691 |
| 1 | 4.928922 |
| 1.5 | 7.393382 |
| 2 | 9.857843 |
| 3 | 14.78676 |
| 4 | 19.71569 |
| 5 | 24.64461 |
| 6 | 29.57353 |
Values are rounded to 7 significant figures.
Common questions
How do I convert US teaspoons to millilitres?
Multiply the number of US teaspoons by 4.928921594. For example, 1 tsp × 4.928921594 = 4.928922 mL.
How many millilitres are in one US teaspoon?
One US teaspoon is about 4.928922 millilitres.
Is this conversion exact?
Yes. Both units have exact legal definitions, so the factor is exact. Values on this page are rounded to 7 significant figures.