Teaspoons to Milliliters Converter
Enter the volume in teaspoons below to convert it to milliliters.
Convert Teaspoons (US) to Milliliters
Enter a value in teaspoons (us) (tsp) to convert to milliliters (mL).
Teaspoon to Milliliter Conversion Table
Table showing various teaspoon measurements converted to milliliters. Click any preset value or arrow to load it into the converter.
| Teaspoons (US) (tsp) | Milliliters (mL) |
|---|---|
| 1 tsp | 4.9289216 mL |
| 1.5 tsp | 7.3933824 mL |
| 2 tsp | 9.8578432 mL |
| 3 tsp | 14.7867648 mL |
| 5 tsp | 24.644608 mL |
| 6 tsp | 29.5735296 mL |
| 10 tsp | 49.2892159 mL |
| 15 tsp | 73.9338239 mL |
| 20 tsp | 98.5784319 mL |
| 25 tsp | 123.2230398 mL |
How to Convert Teaspoons to Milliliters
To convert teaspoons to milliliters, multiply the volume by the following conversion ratio: 4.9289216 milliliters/teaspoon.
Since one teaspoon is equal to 4.9289216 milliliters, you can use this simple formula to convert:
The volume in milliliters is equal to the volume in teaspoons multiplied by 4.9289216.
For example, here's how to convert 3 teaspoons to milliliters using the formula above.
How Many Milliliters Are in a Teaspoon?
There are 4.9289216 milliliters in a teaspoon, which is why we use this value in the formula above.
Our teaspoon to milliliter calculator automatically converts your volume measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Teaspoons and milliliters are both units used to measure volume. Keep reading to learn more about each unit.
What Is a Teaspoon?
A teaspoon is a unit of volume equal to 0.0049289 liters (L), the base unit for volume. 1/3 of a US tablespoon (4.9289 mL). [1]
The teaspoon is classified as a US customary unit of volume. Teaspoons can be abbreviated as tsp; for example, 1 teaspoon can be written as 1 tsp.
When working with teaspoons (tsp) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, teaspoons (tsp) are widely used across fine-tolerance laboratory, analytical, and micro-scale volume measurements within US customary workflows, engineering documentation, and technical data sheets.
What Is a Milliliter?
A milliliter is a unit of volume equal to 1/1,000 of a liter (0.001 L). One-thousandth of a liter, identical to 1 cubic centimeter (cc). [2]
The milliliter is classified as a metric and SI-compatible unit of volume. Milliliters can be abbreviated as mL; for example, 1 milliliter can be written as 1 mL.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the milliliter (mL) a convenient decimal multiple of the liter (L).
In practice, milliliters (mL) are widely used across fine-tolerance laboratory, analytical, and micro-scale volume measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting volume between teaspoons (tsp) and milliliters (mL), keep full floating-point precision (1 tsp = 4.9289216 mL; 1 mL = 0.2028841 tsp) during intermediate calculations and round only the final milliliter figure to match your instrument tolerance.
More Teaspoon & Milliliter Conversions
Need to calculate in the opposite direction? Use our milliliters to teaspoons (us) converter (mL to tsp) to switch your starting unit immediately. You can also explore related tools such as converting fluid ounces (us) to milliliters, converting cups (us) to milliliters, or converting teaspoons (us) to tablespoons (us).
Convert from Teaspoons
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Volume)·Volume & Liquid Metrology Standard — Teaspoons (US) (tsp) to Milliliters (mL)
- [2]NIST HB 44 SpecificationNIST HB 44 (Liquid & Dry Capacity Tables)·Unit Specifications: Teaspoon (US) (tsp) & Milliliter (mL)
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9)·Conversion Factors & Mathematical Basis (tsp to mL)