Milliliter is 0.001 liter units.
Milliliters to Teaspoons Converter — mL to tsp
Convert Milliliter (mL) to Teaspoon (tsp) using the exact conversion factor (1 milliliter = 0.2028841362 teaspoon). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Milliliters to Teaspoons converter
Converter
Cooking Converter
Convert cooking volume and mass units used in recipes and nutrition workflows.
Context values
Some unit families need one extra value for a physically accurate result.
A US teaspoon is one third of a US tablespoon.
Result = input x 1e-6 / 4.92892159e-6.
Volume units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Milliliters to Teaspoons
Milliliter and Teaspoon both show up in recipes, and converting between them matters whenever a recipe from one country's cookbook needs to be followed with another country's measuring tools. Milliliter is typically associated with standard small-volume unit worldwide, while Teaspoon is typically associated with united States (cooking and recipe measurement).
Formula
teaspoons = milliliters × 0.202884136211
This factor comes from each unit's defined relationship to the category's base unit: 1 milliliter equals 0.000001 base units, and 1 teaspoon equals 0.00000492892159375 base units, so dividing one by the other gives the direct milliliter-to-teaspoon factor of 0.202884136211.
Simple example
1 mL × 0.2028841362 = 0.2028841362 tsp
1 milliliter = 0.2028841362 teaspoons.
Real-world example
2 mL × 0.2028841362 = 0.4057682724 tsp
2 milliliters = 0.4057682724 teaspoons.
Conversion table
| Milliliter (mL) | Teaspoon (tsp) |
|---|---|
| 0.25 mL | 0.0507210341 tsp |
| 0.5 mL | 0.1014420681 tsp |
| 1 mL | 0.2028841362 tsp |
| 2 mL | 0.4057682724 tsp |
| 4 mL | 0.8115365448 tsp |
| 8 mL | 1.62307309 tsp |
Reverse conversion: Teaspoon to Milliliter
0.2028841362 tsp × 4.928921594 = 0.9999999999 mL
0.2028841362 teaspoons = 0.9999999999 milliliters.
milliliters = teaspoons × 4.92892159375
For a page dedicated to this direction, see Teaspoon to Milliliter.
Milliliter vs. Teaspoon
| Aspect | Milliliter | Teaspoon |
|---|---|---|
| Family | SI derived (metric prefix) unit | US customary unit |
| Typical use | Medicine dosing (worldwide, including in the US) | US recipe and cooking measurement for small quantities |
| Where it's used | Standard small-volume unit worldwide | United States (cooking and recipe measurement) |
Understanding the Milliliter
Milliliter (mL) measures volume. A milliliter is one-thousandth of a liter, equal to one cubic centimeter. It is classified as a SI derived (metric prefix) unit.
Where it's used: Standard small-volume unit worldwide
Uses of the Milliliter today
- Medicine dosing (worldwide, including in the US)
- Cooking and recipe measurement outside the US
- Beverage and small-container labeling
History of the Milliliter
The milliliter follows directly from the liter via the 'milli-' SI prefix. It is notable as one of the few metric units in routine US use, since medicine dosing (syringes, liquid medication) is specified in milliliters even in the US.
Historical origin. Milliliter was not the invention of a single named person; it developed through the process described above.
Understanding the Teaspoon
Teaspoon (tsp) measures volume. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 of a US cup. It is classified as a US customary unit.
Where it's used: United States (cooking and recipe measurement)
Uses of the Teaspoon today
- US recipe and cooking measurement for small quantities
- Medication dosing instructions in the US
- Baking measurement alongside the tablespoon and cup
Milliliter — sources
- BIPM SI Brochure — SI prefixes — Defines 'milli-' as the prefix for 10⁻³.
Teaspoon — sources
- NIST Handbook 44, Appendix C — General tables of units including the US teaspoon definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many teaspoons are in 1 milliliter?
1 milliliter equals 0.2028841362 teaspoons, using the exact defined conversion factor rather than an estimate.
How do I convert milliliter to teaspoon?
Multiply the milliliter value by 0.2028841362. The converter above does this instantly to whatever precision you set.
How do I convert teaspoon back to milliliter?
Use the reverse factor: 1 teaspoon equals 4.928921594 milliliters. You can also use the swap control in the converter above to flip the direction instantly.
What is a milliliter?
Milliliter (mL) measures volume. A milliliter is one-thousandth of a liter, equal to one cubic centimeter. It is classified as a SI derived (metric prefix) unit.
What is a teaspoon?
Teaspoon (tsp) measures volume. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 of a US cup. It is classified as a US customary unit.
Is the milliliter to teaspoon conversion exact?
Yes. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 of a US cup. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the milliliter still used today?
Standard small-volume unit worldwide