# mL to Teaspoons Converter

URL: https://speedycalculator.com/calculators/conversion/ml-tsp-converter/
Last updated: 2026-10-25

> Convert millilitres (mL) to teaspoons (US) (tsp): 1 millilitre = 0.20288414 tsp, so multiply by 0.20288414 or divide by 4.9289216. Both fields are editable, so you can also type in teaspoons (US) and get millilitres back.

## Inputs

- Millilitres (mL)

## Results

- Teaspoons (US)

## Formula

```
1 mL = 0.20288414 tsp
1 tsp = 4.9289216 mL
tsp = mL × 0.20288414
```

## Explanation

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

MillilitresTeaspoons (US)Teaspoons (US)Millilitres1 mL0.20288414 tsp1 tsp4.9289216 mL2 mL0.40576827 tsp2 tsp9.8578432 mL2.5 mL0.50721034 tsp5 tsp24.644608 mL5 mL1.0144207 tsp10 tsp49.289216 mL7.5 mL1.521631 tsp20 tsp98.578432 mL10 mL2.0288414 tsp50 tsp246.44608 mL15 mL3.043262 tsp100 tsp492.89216 mL20 mL4.0576827 tsp1,000 tsp4,928.9216 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.

## Worked example

Inputs — Millilitres: 5 mL.

Results — **Teaspoons (US) = 1.01442068 tsp**.

## FAQ

**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.


## Sources

- [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)