A U.S. teaspoon is about 4.93 mL; the metric teaspoon is exactly 5 mL. For medicine, always use the dosing cup or syringe supplied rather than a kitchen spoon.
How to use the mL to Teaspoons Converter
- Type the number of millilitres into the Millilitres field. Decimals such as 2.5 are fine.
- Read the answer in Teaspoons (US) – it updates as you type, with no button to press.
- To convert the other way, type into Teaspoons (US) and the millilitres are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only mL ⇄ tsp. Need a different unit? Use the general volume converter, where you can choose any “from” and “to” unit.
How it works
Both units measure volume, so they are always in the same ratio: one millilitre equals 0.20288414 teaspoons (US). The calculator multiplies the number of millilitres you type by 0.20288414 to give teaspoons (US), and when you type into the teaspoons (US) field it divides by the same factor to give millilitres. Because the ratio never changes, doubling the millilitres always doubles the teaspoons (US). Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
How to convert millilitres to teaspoons (US)
- Write down the value in millilitres, for example 5 mL.
- Multiply by the conversion factor 0.20288414 (because 1 millilitre = 0.20288414 tsp).
- 5 × 0.20288414 = 1.0144207 tsp.
- To go back from teaspoons (US) to millilitres, divide by 0.20288414 – or multiply by 4.9289216.
mL to tsp conversion table
| Millilitres | Teaspoons (US) | Teaspoons (US) | Millilitres |
|---|---|---|---|
| 1 mL | 0.20288414 tsp | 1 tsp | 4.9289216 mL |
| 2 mL | 0.40576827 tsp | 2 tsp | 9.8578432 mL |
| 2.5 mL | 0.50721034 tsp | 5 tsp | 24.644608 mL |
| 5 mL | 1.0144207 tsp | 10 tsp | 49.289216 mL |
| 7.5 mL | 1.521631 tsp | 20 tsp | 98.578432 mL |
| 10 mL | 2.0288414 tsp | 50 tsp | 246.44608 mL |
| 15 mL | 3.043262 tsp | 100 tsp | 492.89216 mL |
| 20 mL | 4.0576827 tsp | 1,000 tsp | 4,928.9216 mL |
What is a millilitre?
A millilitre is one thousandth of a litre and exactly one cubic centimetre. Medicines, cosmetics, drinks and kitchen measures are labelled in mL.
What is a teaspoon?
A U.S. teaspoon is one third of a tablespoon, about 4.93 mL; the metric teaspoon is 5 mL. For medicines always use the measuring device supplied.
Quick mental conversion
For a fast estimate, multiply millilitres by about 0.2 to get teaspoons (US); the error is about 1.4%. Use the calculator above when you need the exact figure.
Common mistakes to avoid
Mixing u.s. and uk gallons, pints and fluid ounces, assuming a cup is always 250 ml, and treating volume and weight as interchangeable for anything except water.
Formula
1 mL = 0.20288414 tsp1 tsp = 4.9289216 mLtsp = mL × 0.20288414Worked example
Inputs — Millilitres: 5 mL.
Results — Teaspoons (US) = 1.01442068 tsp.
Frequently asked questions
How many teaspoons in 5 mL?
About 1.01 U.S. tsp, or exactly 1 metric tsp.
How many mL in a teaspoon?
4.93 mL (U.S.), 5 mL (metric).
How many teaspoons (US) are in one millilitre?
1 mL = 0.20288414 tsp.
How many millilitres are in one teaspoon (US)?
1 tsp = 4.9289216 mL.
How do I convert millilitres to teaspoons (US)?
Multiply the number of millilitres by 0.20288414. For example, 5 mL × 0.20288414 = 1.0144207 tsp.
How do I convert teaspoons (US) back to millilitres?
Divide by 0.20288414 (or multiply by 4.9289216), or simply type the value into the teaspoons (US) field above.
What is 10 mL in teaspoons (US)?
10 mL = 2.0288414 tsp.
What is 2 mL in teaspoons (US)?
2 mL = 0.40576827 tsp.
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between millilitres and teaspoons (US). To pick any volume unit, use the general volume converter linked under Related calculators.
What formula does the mL to Teaspoons Converter use?
1 mL = 0.20288414 tsp.