Convert Milliliter to US Teaspoon
Convert milliliters to us teaspoons instantly. 1 milliliter = 0.2028841362 us teaspoon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Teaspoon to Milliliter converter for the reverse conversion.
Units explained
Milliliter
A milliliter is one thousandth of a liter, exactly equal to one cubic centimeter.
Formed with the SI prefix milli- applied to the liter.
The standard small-volume unit in cooking, medicine and the laboratory.
Metric prefix system.
US Teaspoon
A US teaspoon is one third of a US tablespoon (4.9289 mL).
A standardized small cooking measure.
Used everywhere in US recipes and home dosing.
US cooking measure.
Milliliter to US Teaspoon conversion formula
The relationship between milliliters and us teaspoons:
To convert milliliters to us teaspoons, multiply the value in milliliters by 0.2028841362. To reverse, multiply us teaspoons by 4.9289215937.
How to use this converter
Type a value into the calculator. The result in us teaspoons updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the US Teaspoon to Milliliter converter for the reverse direction.
Step-by-step: convert milliliters to us teaspoons
- Write down the value in milliliters (mL).
- Multiply that value by the factor 0.2028841362.
- The product is the equivalent value in us teaspoons (tsp).
- To reverse, multiply the us teaspoon value by 4.9289215937.
Worked examples
Example 1 — Convert 1 mL to tsp:
1 × 0.2028841362 = 0.2028841362 tsp
Example 2 — Convert 100 mL to tsp:
100 × 0.2028841362 = 20.2884136211 tsp
Real-world example — Plastic-film thickness alternates
A 150-milliliter plastic film converts cleanly to us teaspoons — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 mL × 0.2028841362 = 30.4326204317 tsp
Real-world example — Hair-width scale measurements
A 70-milliliter measurement (about the diameter of a human hair) is the kind of value materials engineers regularly express in adjacent micro-scale units like us teaspoons for direct comparison across supplier datasheets.
70 mL × 0.2028841362 = 14.2018895348 tsp
Real-world example — Paper and film thicknesses
At the thickness of office paper (roughly 3 milliliters), converting between sub-millimeter units is routine for packaging and printing buyers comparing quotes from metric and US suppliers.
3 mL × 0.2028841362 = 0.6086524086 tsp
Milliliter to US Teaspoon conversion table
Standard reference values for converting milliliters to us teaspoons:
| Milliliter [mL] | US Teaspoon [tsp] |
|---|---|
| 0.01 | 0.0020288414 |
| 0.1 | 0.0202884136 |
| 1 | 0.2028841362 |
| 2 | 0.4057682724 |
| 3 | 0.6086524086 |
| 4 | 0.8115365448 |
| 5 | 1.0144206811 |
| 10 | 2.0288413621 |
| 20 | 4.0576827242 |
| 30 | 6.0865240863 |
| 40 | 8.1153654484 |
| 50 | 10.1442068106 |
| 100 | 20.2884136211 |
| 500 | 101.4420681055 |
| 1000 | 202.8841362111 |
Frequently asked questions
How many us teaspoons is 1 milliliter?
How do I convert milliliters to us teaspoons?
How do I convert us teaspoons back to milliliters?
How many us teaspoons is 100 milliliters?
Popular volume unit conversions
Convert Milliliter to other volume units
Show all Milliliter conversions
Metric / SI (13 units)
US Customary (Liquid) (15 units)
US Customary (Dry) (5 units)
Imperial (UK) (14 units)
Cubic (length-derived) (4 units)
Cooking / Culinary (5 units)
Sources & references
Conversion factor (1 mL = 0.2028841362 tsp) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.