1 tsp to mL
- US teaspoons (tsp)
- 1 tsp
- Milliliters
- 4.92892159375 mL
Checked against: Exact-fraction computation from the legal unit definitions
US teaspoons to milliliters converter
Convert US teaspoons to milliliters (teaspoons to ml) with the exact factor, a conversion chart and worked steps.
By AdminDrafted with AI writing toolsUpdated Checked examples: 3
Milliliters
mL
Milliliters: 4.92892159375 mL
- Conversion
- 1 tsp = 4.9289215938 mL
- 1 mL in US teaspoons
- 0.2028841362tsp
1 tsp is about 4.9289215938 mL. In the other direction, 1 mL ≈ 0.20288414 tsp.
US teaspoons to milliliters
Teaspoons to ml chart
| US teaspoons | Milliliters |
|---|---|
| 0.25 | 1.2322 |
| 0.5 | 2.4645 |
| 0.75 | 3.6967 |
| 1 | 4.9289 |
| 1.5 | 7.3934 |
| 2 | 9.8578 |
| 3 | 14.7868 |
| 4 | 19.7157 |
| 5 | 24.6446 |
How it's calculated S
Conversion factor
Exact by definition.
Multiply
About the US teaspoons to milliliters converter
To convert US teaspoons to milliliters, multiply by 4.9289215938; to convert back, multiply by 0.2028841362. For example, 1 tsp is about 4.928922 mL. Displayed factors and results may be rounded.
Teaspoon quantities are useful when a recipe calls for a small amount and only a larger measure is available. Enter fractions precisely and check the US measuring-spoon convention. Ordinary cutlery is not a calibrated measuring tool.
US teaspoon: 1 US tsp = 1/3 US tbsp = 4.92892159375 mL. These values are exact.
Both units are defined exactly. Calculations use 50 significant digits and round only for display.
How to convert teaspoons to mL
Multiply US teaspoons by 4.92892159375: mL = tsp × 4.92892159375. So 1 teaspoon is 4.93 mL and 4 teaspoons are 19.72 mL. That is the US teaspoon of American recipes; metric recipes and US nutrition labels use a teaspoon of exactly 5 mL.
Why a US teaspoon is 4.93 mL
US cooking measures are fractions of the US gallon: 231 cubic inches, exactly 3.785411784 L. A fluid ounce is 1/128 gallon (29.5735295625 mL), a tablespoon is half a fluid ounce and a teaspoon a third of a tablespoon.
So 1 tsp = 29.5735295625 ÷ 6 = 4.92892159375 mL, an exact figure with no rounding (NIST Handbook 44, Appendix C).
Teaspoons to mL chart
| US teaspoons | Milliliters |
|---|---|
| 0.25 | 1.2322303984375 |
| 0.5 | 2.464460796875 |
| 1 | 4.92892159375 |
| 1.5 | 7.393382390625 |
| 3 | 14.78676478125 |
| 4 | 19.715686375 |
Three teaspoons make one US tablespoon, 14.78676478125 mL, so 1 tablespoon plus 1 teaspoon is 4 teaspoons, or 19.715686375 mL. A US cup holds 48 teaspoons, 236.5882365 mL.
Is a teaspoon 5 mL?
A metric teaspoon is exactly 5 mL, about 1.4% more than a US teaspoon. US nutrition labels also count a teaspoon as 5 mL under 21 CFR 101.9(b)(5)(viii), so "1 tsp (5 mL)" on a label uses the rounded size.
Four metric teaspoons hold 20 mL and four US teaspoons 19.715686375 mL, a gap of 0.284313625 mL. For cooking the two spoons are interchangeable. Where a figure must match a label or a lab protocol, use the definition it states.
How many grams is a teaspoon?
It depends on the ingredient, since mL measure volume. By the King Arthur Baking and USDA figures in the cooking converter, a US teaspoon holds about 4.93 g of water, 6 g of table salt or baking soda, 4 g of baking powder or 7 g of honey.
Common mistakes
- Mixing up teaspoons and tablespoons. Recipes abbreviate teaspoon as tsp or t and tablespoon as tbsp or T. A tablespoon is three times as large.
- Assuming every tablespoon is 3 teaspoons. An Australian tablespoon is 20 mL, which is four metric teaspoons.
- Measuring with cutlery. A spoon from the drawer is not a measure. For liquid medicine, use the dosing syringe or cup that comes with it.
Related converters
For larger spoons, use tablespoons to mL or teaspoons to tablespoons. The volume converter includes the metric teaspoon and tablespoon.
Worked examples
4 tsp to mL
- US teaspoons (tsp)
- 4 tsp
- Milliliters
- 19.715686375 mL
Checked against: Exact-fraction computation from the legal unit definitions
0.25 tsp to mL
- US teaspoons (tsp)
- 0.25 tsp
- Milliliters
- 1.23223039844 mL
Checked against: Exact-fraction computation from the legal unit definitions
Questions
How many milliliters are in one US teaspoon?
1 tsp is about 4.9289215938 mL. US teaspoon: 1 US tsp = 1/3 US tbsp = 4.92892159375 mL. These values are exact.
How do I convert US teaspoons to milliliters?
Multiply by 4.9289215938: 1 tsp × 4.9289215938 ≈ 4.928922 mL. To convert back, divide by the same factor. The factor shown may be rounded.
How can I estimate US teaspoons in milliliters without a calculator?
Multiply by 5. This is 1.4% above the exact factor (about 4.9289215938), so 1 tsp comes out as 5 mL instead of 4.9289 mL.
About this calculator
Sources
Checked against references
This calculator includes 3 worked examples with independently sourced answers. They run in the test suite, and you can run them here too.