mL to tsp Converter
5 mL is about 1 US teaspoon, and 15 mL is just over 3 teaspoons. Use this mL to tsp converter when a recipe lists one unit but your measuring spoons use the other. Enter a value in milliliters or teaspoons, choose the direction, and the tool applies the exact US teaspoon of 4.92892159375 mL. That makes it useful for scaling recipes, dosing small liquid ingredients, following international cookbooks, and checking package labels that print volumes in metric units.
Quick answer
One US teaspoon equals 4.92892159375 mL, so this conversion uses a fixed rate rather than an estimate.
Result
1.014421 tsp
What this tells you
- •One US teaspoon equals 4.92892159375 mL, so this conversion uses a fixed rate rather than an estimate.
- •To convert milliliters to teaspoons, divide the mL value by 4.92892159375.
- •To convert teaspoons to milliliters, multiply the teaspoon value by 4.92892159375.
- •In everyday cooking many people round the teaspoon to 5 mL, which is close enough for most home recipes.
- •Decimal inputs work in both directions, which helps with values such as 7.5 mL, 1.5 teaspoons, or 2.25 teaspoons.
How to Use
- 1Enter the value you want to convert, such as 5 mL, 15 mL, 1 teaspoon, or 2.5 teaspoons.
- 2Choose the unit you already have in the From field. Pick mL when your starting value is metric and tsp when your starting value is in teaspoons.
- 3Choose the unit you want in the To field. Select tsp for a teaspoon answer or mL for a metric answer.
- 4Read the main result. The converter uses the exact US teaspoon and shows up to six decimal places.
- 5If your recipe was written with metric spoons where 1 teaspoon equals 5 mL, treat the result as an approximation and adjust slightly for precision baking.
How It Works
Formula
teaspoons = milliliters / 4.92892159375The core rule uses the US teaspoon, which is defined as 4.92892159375 mL, exactly 1/3 of a US tablespoon. To convert milliliters to teaspoons, divide the mL value by 4.92892159375. The reverse rule is milliliters equals teaspoons times 4.92892159375. For example, 15 mL divided by 4.92892159375 gives about 3.043262 teaspoons, and 3 teaspoons times 4.92892159375 gives 14.78676478125 mL.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
Convert 5 mL to teaspoons
Divide 5 by 4.92892159375 and you get about 1.014421 teaspoons. This is why 5 mL is usually called one teaspoon even though the exact US teaspoon is a touch smaller.
Convert 15 mL to teaspoons
Fifteen milliliters divided by 4.92892159375 equals about 3.043262 teaspoons. Most recipes treat 15 mL as three teaspoons, or one tablespoon.
Convert 1 teaspoon to mL
Multiply 1 by 4.92892159375 to get 4.92892159375 mL, the defining value of the US teaspoon.
Convert 2 teaspoons to mL
Multiply 2 by 4.92892159375 to get about 9.857843 mL. Two teaspoons plus one more is a tablespoon at 14.79 mL.
Convert 7.5 mL to teaspoons
Divide 7.5 by 4.92892159375 to get about 1.521631 teaspoons, which is about a teaspoon and a half.
Milliliters to US Teaspoons
Common milliliter values shown as US teaspoons using the exact rate of 4.92892159375 mL per teaspoon.
| mL | US tsp |
|---|---|
| 2.5 mL | 0.507211 tsp |
| 5 mL | 1.014421 tsp |
| 10 mL | 2.028842 tsp |
| 15 mL | 3.043262 tsp |
| 30 mL | 6.086524 tsp |
| 60 mL | 12.173049 tsp |
One US tablespoon equals exactly 3 teaspoons, so divide teaspoon values by 3 for tablespoons.
US teaspoons, metric teaspoons, and why the size matters
The US teaspoon is defined as exactly one-third of a US tablespoon, which is 14.7867648 mL, so the teaspoon is 4.92892159375 mL. In everyday cooking this is usually rounded to 5 mL, which is also the exact size of the metric teaspoon used in most of the world. The gap between 4.929 mL and 5 mL is small, about 1.4 percent, so for a single spoon of vanilla extract or baking powder it rarely matters. For a recipe scaled up several times, or for a very small amount where the error is a larger share of the total, the difference can become noticeable.
Common mistakes
- Assuming every teaspoon is exactly 5 mL. The US teaspoon is 4.92892159375 mL, about 1.4 percent smaller than the metric teaspoon.
- Confusing teaspoons with tablespoons. One US tablespoon equals three teaspoons, so dividing by the wrong unit gives a result three times off.
- Rounding too early on small values. Keep the full result until the end if precision matters.
- Forgetting that the reverse direction is multiplication. If you already have teaspoons and want mL, multiply by 4.92892159375 instead of dividing.
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