1 US teaspoon = 4.928921594 millilitres
A US teaspoon is 4.929 mL, rounded to 5 mL for medicine. Kitchen teaspoons vary by several millilitres, which is why dosing spoons are supplied with liquid medication.
Formula mL = tsp × 4.92892159375
Type in either field — the other updates on every keystroke. Need other units? Open the full fluid converter.
| US teaspoon | Millilitre |
|---|---|
| 1 tsp | 4.928922 mL |
| 2 tsp | 9.857843 mL |
| 3 tsp | 14.786765 mL |
| 4 tsp | 19.715686 mL |
| 5 tsp | 24.644608 mL |
| 10 tsp | 49.289216 mL |
| 15 tsp | 73.933824 mL |
| 20 tsp | 98.578432 mL |
| 25 tsp | 123.22304 mL |
| 50 tsp | 246.44608 mL |
| 100 tsp | 492.892159 mL |
| 500 tsp | 2464.460797 mL |
| 1000 tsp | 4928.921594 mL |
| Millilitre | US teaspoon |
|---|---|
| 1 mL | 0.202884 tsp |
| 2 mL | 0.405768 tsp |
| 3 mL | 0.608652 tsp |
| 4 mL | 0.811537 tsp |
| 5 mL | 1.014421 tsp |
| 10 mL | 2.028841 tsp |
| 15 mL | 3.043262 tsp |
| 20 mL | 4.057683 tsp |
| 25 mL | 5.072103 tsp |
| 50 mL | 10.144207 tsp |
| 100 mL | 20.288414 tsp |
| 500 mL | 101.442068 tsp |
| 1000 mL | 202.884136 tsp |
| Situation | From | To |
|---|---|---|
| Quarter teaspoon | 0.25 tsp | 1.232 mL |
| Half teaspoon | 0.5 tsp | 2.464 mL |
| One teaspoon | 1 tsp | 4.929 mL |
| Two teaspoons | 2 tsp | 9.858 mL |
| One tablespoon | 3 tsp | 14.79 mL |
| Two tablespoons | 6 tsp | 29.57 mL |
Use 5 mL for a teaspoon, which reads 1.4% high.
Spices, extracts and baking powder are measured by the teaspoon. Three teaspoons is 14.79 mL, one US tablespoon.
Always use level measuring spoons rather than cutlery. For medicine, use the dosing device supplied rather than a kitchen spoon.
The US teaspoon is a third of a tablespoon, exactly 4.92892159375 mL.
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