Teaspoons to Milliliters Converter
Unit ConversionConvert teaspoons to milliliters: 1 teaspoon equals exactly 4.92892159375 milliliters. With a conversion table, the formula and every related volume converter.
Milliliters
Equivalent volume in milliliters
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SponsoredThis calculator converts a volume in teaspoons to milliliters using the exact US customary factor: multiply the teaspoon value by 4.92892159375. One US teaspoon is defined as exactly one 768th of a US gallon, and one US gallon as exactly 3,785.411784 mL, so this factor carries no rounding at all.
Teaspoon measurements appear constantly in recipes, supplement labels, and medication dosing instructions, while many countries and scientific contexts expect a metric milliliter value instead. Converting between the two comes up whenever a US recipe needs to be followed with metric measuring tools, or a dose needs to be checked against a milliliter-marked oral syringe.
For the reverse direction, converting milliliters back into teaspoons, or converting a teaspoon value into tablespoons instead, see the related converters below.
Teaspoons to Milliliters Conversion Table
This table covers common recipe and dosing measurements.
| Teaspoons | Milliliters |
|---|---|
| 0.25 tsp | 1.232 ml |
| 0.5 tsp | 2.464 ml |
| 1 tsp | 4.929 ml |
| 1.5 tsp | 7.393 ml |
| 2 tsp | 9.858 ml |
| 3 tsp | 14.787 ml |
| 4 tsp | 19.716 ml |
| 5 tsp | 24.645 ml |
| 8 tsp | 39.431 ml |
The Teaspoons to Milliliters Formula
To convert teaspoons to milliliters, multiply the teaspoon value by 4.92892159375. For example, 2 teaspoons times 4.92892159375 equals 9.86 mL.
To go the other way, use the Milliliters to Teaspoons converter instead, which divides by the same factor for you. For a teaspoon value that needs to become tablespoons, see the Teaspoons to Tablespoons converter below.
Why Some Sources Say 1 Teaspoon Equals 5 mL
The exact US customary teaspoon is 4.92892159375 mL, but US nutrition labeling and most medicine dosing charts round this to exactly 5 mL for simplicity. This is a genuinely different, officially-sanctioned rounding, not an error: an oral syringe or dosing cup marked in 5 mL increments is calibrated to this rounded value, not the exact customary one.
Which Figure Should You Use?
For cooking and baking, the full 4.92892159375 mL factor used throughout this calculator is the more precise choice. For following a medication dosing instruction that specifies "1 teaspoon," use whatever dosing device came with the medicine, since it is calibrated to match that specific instruction, typically the rounded 5 mL figure.
The Teaspoons to Grams Converter turns teaspoons into grams, using the density of the ingredient you pick. Because 1 cubic centimeter is exactly 1 milliliter, the Cubic Centimeters to Milliliters Converter is the quick check when a label uses cc instead of mL. The Cooking Unit Converter handles teaspoons, tablespoons, cups, fluid ounces, and milliliters together, which helps when a recipe switches between them.
Frequently Asked Questions
How many milliliters is 7 teaspoons?
About 34.5025 milliliters.
How many milliliters is 9 teaspoons?
About 44.3603 milliliters.
Is 5 mL always exactly 1 teaspoon?
Not quite exactly, but close enough for cooking and standard dosing purposes. The precise customary value is 4.9289 mL; 5 mL is the officially rounded figure used on nutrition labels and most dosing devices.
How many mL is half a teaspoon?
0.5 teaspoon equals approximately 2.46 mL using the exact factor, or 2.5 mL using the rounded dosing figure.
Why do medicine droppers use mL instead of teaspoons?
A mL-marked device gives a more precise, internationally consistent reading than a household teaspoon, which can vary in actual volume depending on the utensil.
Can a teaspoons-to-mL result be negative?
No. A volume can't be below zero, so a negative entry shows a dash instead of a result. A minus sign in front of a value is usually a typing slip.
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