Teaspoons to Milliliters
Convert teaspoon to milliliter instantly — type a value and read the result, with the exact formula shown.
Reviewed by the CalcCafe editorial team · Last updated 1 July 2026 · How we test our tools
Example
1 tsp = 4.928922 mL, 5 tsp = 24.64461 mL, 10 tsp = 49.28922 mL.
Common conversions: teaspoon to milliliter
Quick reference for the tsp → mL values you are most likely to need, computed with the exact factor the converter above uses. It includes the specific values people most often look up (0.5 tsp, 0.25 tsp, 5 tsp, 1 tsp, 2 tsp).
| Teaspoon (tsp) | Milliliter (mL) |
|---|
| 0.25 tsp | 1.2322 mL |
| 0.5 tsp | 2.4645 mL |
| 1 tsp | 4.9289 mL |
| 2 tsp | 9.8578 mL |
| 3 tsp | 14.7868 mL |
| 4 tsp | 19.7157 mL |
| 5 tsp | 24.6446 mL |
| 10 tsp | 49.2892 mL |
| 15 tsp | 73.9338 mL |
| 20 tsp | 98.5784 mL |
| 25 tsp | 123.223 mL |
| 30 tsp | 147.8676 mL |
| 40 tsp | 197.1569 mL |
| 50 tsp | 246.4461 mL |
| 60 tsp | 295.7353 mL |
| 70 tsp | 345.0245 mL |
| 75 tsp | 369.6691 mL |
| 80 tsp | 394.3137 mL |
| 90 tsp | 443.6029 mL |
| 100 tsp | 492.8922 mL |
| 150 tsp | 739.3382 mL |
| 200 tsp | 985.7843 mL |
| 250 tsp | 1,232.23 mL |
| 500 tsp | 2,464.46 mL |
| 1,000 tsp | 4,928.92 mL |
Milliliter to Teaspoon
| Milliliter (mL) | Teaspoon (tsp) |
|---|
| 1 mL | 0.202884 tsp |
| 5 mL | 1.0144 tsp |
| 10 mL | 2.0288 tsp |
| 50 mL | 10.1442 tsp |
| 100 mL | 20.2884 tsp |
How it works
Milliliter = Teaspoon × 4.928922. Every value is converted through a single liter base unit using internationally defined conversion factors, so any from/to pair stays consistent.
Good to know
Converting teaspoons to milliliters bridges two very different measuring worlds: the spoon you scoop with in an American kitchen and the precise metric markings on a syringe, medicine cup, or European recipe. It comes up most often when you are doubling a recipe written in US units, dosing a child's liquid medication, or following baking instructions from a metric country that lists ingredients in mL rather than spoons.
The teaspoon here is the US customary teaspoon, defined as exactly one-sixth of a US fluid ounce, which works out to 4.928922 mL. The milliliter, by contrast, is pure metric — one-thousandth of a liter — and is the same everywhere in the world. That mismatch in origin is why the number is so awkward: a clean metric unit is being measured against a spoon size that was standardized around the US gallon, not the liter.
For everyday cooking, the rule of thumb is simply to treat 1 tsp as 5 mL. The real value is only about 1.4 percent smaller, so a teaspoon of vanilla or baking powder is close enough at 5 mL that no recipe will notice. To go the other way fast, remember that roughly 3 teaspoons fill 15 mL (one tablespoon), and 20 teaspoons make about 100 mL.
The most common mistake is assuming all teaspoons are 5 mL. They are not: a UK or Australian metric teaspoon is defined as exactly 5 mL, while the US teaspoon on this page is 4.928922 mL. The gap is trivial in the kitchen but matters for liquid medicine, where pharmacists and dosing devices use the exact 5 mL metric spoon — so always dose with a marked oral syringe, never a cutlery teaspoon, which can hold anywhere from 3 to 7 mL.
Frequently asked questions
How do you convert teaspoon to milliliter?
Multiply the number of teaspoons by 4.928922 to get milliliters. For example, 1 tsp = 4.928922 mL.
What is 1 teaspoon in milliliters?
1 teaspoon equals 4.928922 milliliters (1 tsp = 4.928922 mL).
How many teaspoons are in 1 milliliter?
There are 0.2028841 teaspoons in 1 milliliter.
Is this converter free and private?
Yes. It runs entirely in your browser, so your inputs never leave your device, there is no sign-up, and it works offline once loaded.
Are the conversions exact?
Conversions use internationally defined factors and are exact where the definitions are exact (for example, 1 inch = 2.54 cm). Displayed results are rounded for readability.
People also ask
How many mL is 2 teaspoons?
Two US teaspoons equal 9.857844 mL, which rounds to about 10 mL. Using the 5 mL kitchen rule, you can just call it 10 mL.
Is a teaspoon 5 mL or 4.929 mL?
A US customary teaspoon is 4.928922 mL, while the UK and Australian metric teaspoon is defined as exactly 5 mL. Most measuring spoons and medicine dosing follow the rounded 5 mL standard.
How many teaspoons are in 10 mL?
10 mL equals about 2.029 US teaspoons, so just over 2 teaspoons. In metric-spoon terms (5 mL each) it is exactly 2 teaspoons.
How many teaspoons is 15 mL?
15 mL is about 3.043 US teaspoons, essentially 3 teaspoons — which is also one US tablespoon. This is why a tablespoon is often listed as 15 mL.
How much is half a teaspoon in mL?
Half a US teaspoon is 2.464461 mL, commonly rounded to 2.5 mL. Most oral syringes have a 2.5 mL mark for exactly this dose.
Why isn't a teaspoon exactly 5 mL?
The US teaspoon was defined from the US fluid ounce (1/6 of an ounce), which predates metric standardization, giving 4.928922 mL. Metric countries later rounded their cooking teaspoon to a clean 5 mL.
How many mL in a teaspoon of medicine?
For medicine, a teaspoon is treated as exactly 5 mL, since that is the international standard for liquid dosing. Always measure with a marked syringe or cup rather than a kitchen spoon for accuracy.
How do I convert teaspoons to mL without a calculator?
Multiply the number of teaspoons by 5 for a quick estimate (1 tsp is about 5 mL). For the exact US value, multiply by 4.928922 instead.
Is 1 mL equal to 1 tsp?
No, a teaspoon is much bigger than a milliliter: 1 US teaspoon is 4.928922 mL, so 1 mL is only about one fifth of a teaspoon (1 ÷ 4.928922 = 0.203 tsp). Medicine dosing cups and syringes are marked in mL precisely because a kitchen spoon can be off by a lot. If a label says 5 mL, that is one measuring teaspoon, not five.
Is 1 tablespoon 5 mL or 15 mL?
15 mL. A US tablespoon is 3 teaspoons, or 3 × 4.928922 = 14.786766 mL, which recipes and medicine labels round to 15 mL; 5 mL is a teaspoon, not a tablespoon. Keep the two straight, because confusing them triples or thirds the amount.
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Sources & references
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