Teaspoon (US customary) to Milliliter Converter
1 US teaspoon is exactly 4.92892159375 milliliters. Convert US teaspoons (tsp) to milliliters (mL) below: type a value and the result updates as you type.
tsp to mL calculator
Result
Teaspoon (US customary) to Milliliter conversion
1 tsp = 4.92892159375 mLone US teaspoon in milliliters
1 mL ≈ 0.2028841362 tspone milliliter in US teaspoons
Teaspoon (US customary) (tsp): 1/3 of a US tablespoon. The US labeling teaspoon (exactly 5 mL) is a different, rounded unit.
Milliliter (mL): One thousandth of a liter (1 cubic centimeter).
Source:Teaspoon (US customary): NIST Special Publication 811 (2008), Appendix B.8 (US liquid measures derive from the exact 231 cubic inch gallon); Milliliter: SI Brochure, 9th edition (BIPM, 2019)
How to convert US teaspoons to milliliters
To convert US teaspoons to milliliters, multiply the number of US teaspoons by 4.92892159375.
Formula
mL = tsp × 4.92892159375
Examples
- 5 tsp = 5 × 4.92892159375 = 24.64460796875 mL
- 25 tsp = 25 × 4.92892159375 = 123.22303984375 mL
- 100 tsp = 100 × 4.92892159375 = 492.892159375 mL
Teaspoon (US customary) to Milliliter conversion table
| Teaspoon (US customary) (tsp) | Milliliter (mL) |
|---|---|
| 0.1 tsp | 0.492892159375 mL |
| 0.5 tsp | 2.464460796875 mL |
| 1 tsp | 4.92892159375 mL |
| 2 tsp | 9.8578431875 mL |
| 3 tsp | 14.78676478125 mL |
| 5 tsp | 24.64460796875 mL |
| 10 tsp | 49.2892159375 mL |
| 20 tsp | 98.578431875 mL |
| 25 tsp | 123.22303984375 mL |
| 50 tsp | 246.4460796875 mL |
| 100 tsp | 492.892159375 mL |
| 250 tsp | 1232.2303984375 mL |
| 500 tsp | 2464.460796875 mL |
| 1000 tsp | 4928.92159375 mL |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many milliliters are in one US teaspoon?
- One US teaspoon is exactly 4.92892159375 milliliters.
- How do I convert milliliters to US teaspoons?
- To convert milliliters to US teaspoons, divide the number of milliliters by 4.92892159375. The formula is tsp = mL ÷ 4.92892159375.
- Is this conversion exact?
- Yes. Both units have exact definitions and the factor 4.92892159375 is exact. Displayed results are only rounded when they have many decimal places.
- Which is larger, a US teaspoon or a milliliter?
- A US teaspoon is 4.92892159375 times larger than a milliliter. In other words, a milliliter is about 0.2028841362 of a US teaspoon.