Teaspoons to Milliliters
Convert teaspoons to milliliters instantly — one teaspoon is 4.92892 milliliters.
| Teaspoons | Milliliters |
|---|---|
| 1 tsp | 4.928922 mL |
| 2 tsp | 9.857843 mL |
| 3 tsp | 14.786765 mL |
| 5 tsp | 24.644608 mL |
| 10 tsp | 49.289216 mL |
| 25 tsp | 123.22304 mL |
| 50 tsp | 246.44608 mL |
| 100 tsp | 492.892159 mL |
How to use
- Enter a value in the Teaspoons field.
- The Milliliters figure appears immediately — no button to press.
- Typing in the Milliliters field converts back to Teaspoons the same way.
- Use the reference table for the values that come up most often.
Teaspoons to Milliliters formula
Converting teaspoons to milliliters is a single multiplication by 4.92892159.
mL = tsp × 4.92892159
Why this factor: the teaspoon and the milliliter are both defined against the liter, so dividing one definition by the other gives 4.92892159 directly. Both definitions are set out in full below.
To go the other way, divide by 4.92892159 — or use the Milliliters to Teaspoons converter, which is the same calculation reversed.
Worked example
Given 8 tsp, multiplying by 4.92892159 yields 39.431373 mL.
8 tsp × 4.92892159 = 39.431373 mL
The converter above does this for any value you type, in either direction.
What is a teaspoon?
A US teaspoon is the smallest common cooking measure, one third of a tablespoon.
Definition: Exactly one sixth of a US fluid ounce, so about 4.9289 milliliters — conventionally rounded to 5 mL.
Where it is used: Recipes, spice and leavening quantities, and liquid medicine doses.
What is a milliliter?
A milliliter is one thousandth of a liter, and is exactly the same volume as a cubic centimeter.
Definition: Exactly 0.001 liter, which is exactly 1 cm³.
Where it is used: Medicine doses, cosmetics, recipe quantities, and laboratory work.
Worth knowing: 1 mL = 1 cm³ = 1 cc exactly, so these three units are interchangeable.
Teaspoons vs Milliliters
The teaspoon is a US customary unit while the milliliter is a metric unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many milliliters are in a teaspoon?
One teaspoon equals 4.92892159 milliliters.
What is the formula to convert teaspoons to milliliters?
Multiply the number of teaspoons by 4.92892159. To reverse it, divide by 4.92892159 instead.
How do I convert milliliters back to teaspoons?
Divide by 4.92892159, which is the same as multiplying by 0.202884136.
How many milliliters are in 10 teaspoons?
10 tsp works out to 49.289216 mL.
Is there anything to watch out for with milliliters?
1 mL = 1 cm³ = 1 cc exactly, so these three units are interchangeable.
How is the teaspoon defined?
Exactly one sixth of a US fluid ounce, so about 4.9289 milliliters — conventionally rounded to 5 mL.