How to convert millilitres to US teaspoons
One millilitre equals 0.202884 US teaspoons, so multiply the number of millilitres by 0.202884:
tsp = ml × 0.202884
ml = tsp ÷ 0.202884 (1 tsp = 4.9289 ml)
Example: 2.5 ml → 2.5 × 0.202884 = 0.50721 tsp.
Going the other way, divide by 0.202884, or multiply by 4.9289; the US teaspoons to millilitres converter does it for you.
Everyday values
| Millilitres | US teaspoons | For example |
|---|---|---|
| 2.5 ml | 0.50721 tsp | half a teaspoon |
| 5 ml | 1.0144 tsp | one teaspoon |
| 10 ml | 2.0288 tsp | two teaspoons |
| 15 ml | 3.0433 tsp | one tablespoon |
When you need this conversion
A US teaspoon is 4.93 ml, usually rounded to 5 ml. For medicines, use the oral syringe or cup supplied with the product; kitchen teaspoons vary from about 3 to 7 ml.
Millilitre to US teaspoon conversion table
| ml | tsp | ml | tsp |
|---|---|---|---|
| 1 ml | 0.202884 tsp | 13 ml | 2.6375 tsp |
| 2 ml | 0.405768 tsp | 14 ml | 2.8404 tsp |
| 3 ml | 0.608652 tsp | 15 ml | 3.0433 tsp |
| 4 ml | 0.811537 tsp | 16 ml | 3.2462 tsp |
| 5 ml | 1.0144 tsp | 17 ml | 3.449 tsp |
| 6 ml | 1.2173 tsp | 18 ml | 3.6519 tsp |
| 7 ml | 1.4202 tsp | 19 ml | 3.8548 tsp |
| 8 ml | 1.6231 tsp | 20 ml | 4.0577 tsp |
| 9 ml | 1.826 tsp | 21 ml | 4.2606 tsp |
| 10 ml | 2.0288 tsp | 22 ml | 4.4635 tsp |
| 11 ml | 2.2317 tsp | 23 ml | 4.6663 tsp |
| 12 ml | 2.4346 tsp | 24 ml | 4.8692 tsp |
About the units
- Millilitre (ml): one thousandth of a litre, the same as one cubic centimetre.
- US teaspoon (tsp): 1/3 US tablespoon, about 4.93 millilitres.
Both are units of volume. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many US teaspoons are in one millilitre?
One millilitre is 0.202884 US teaspoons. One US teaspoon is 4.9289 millilitres.
How do I convert millilitres to US teaspoons?
Multiply the value in millilitres by 0.202884. To go back, divide by 0.202884.
What is 2.5 ml in US teaspoons?
2.5 ml = 0.50721 tsp.
What is 5 ml in US teaspoons?
5 ml = 1.0144 tsp.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.