By Tim King · Updated 1 October 2026

Teaspoons to ml

US Teaspoons to Millilitres, Metric 5 ml Teaspoon Explained

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US teaspoons to millilitres formula

ml = teaspoons × 4.92892159375

1 US teaspoon = 4.928921594 millilitres, so multiply US teaspoons by 4.928921594. Going the other way, 1 millilitre = 0.2028841362 US teaspoons.

US teaspoons to millilitres table

US teaspoons (tsp)	millilitres (ml)
0.125	0.616115
0.25	1.23223
0.5	2.46446
0.75	3.69669
1	4.92892
1.25	6.16115
1.5	7.39338
2	9.85784
2.5	12.3223
3	14.7868
4	19.7157
5	24.6446
6	29.5735
8	39.4314
10	49.2892
12	59.1471
15	73.9338
20	98.5784
24	118.294

How many millilitres in US teaspoons?

0.25 tsp = 1.23223 ml. There are 1.23223 millilitres in 0.25 US teaspoons.

0.5 tsp = 2.46446 ml. There are 2.46446 millilitres in 0.5 US teaspoons.

1 tsp = 4.92892 ml. There are 4.92892 millilitres in 1 US teaspoons.

2 tsp = 9.85784 ml. There are 9.85784 millilitres in 2 US teaspoons.

3 tsp = 14.7868 ml. There are 14.7868 millilitres in 3 US teaspoons.

millilitres to US teaspoons formula

teaspoons = ml ÷ 4.92892159375

1 millilitre = 0.2028841362 US teaspoons, so multiply millilitres by 0.2028841362, or divide by 4.928921594.

millilitres to US teaspoons table

millilitres (ml)	US teaspoons (tsp)
1	0.202884
2	0.405768
2.5	0.50721
3	0.608652
4	0.811537
5	1.01442
7.5	1.52163
10	2.02884
12.5	2.53605
15	3.04326
20	4.05768
25	5.0721
30	6.08652
40	8.11537
50	10.1442
60	12.173
75	15.2163
100	20.2884

How many US teaspoons in millilitres?

1 ml = 0.202884 tsp. There are 0.202884 US teaspoons in 1 millilitres.

2.5 ml = 0.50721 tsp. There are 0.50721 US teaspoons in 2.5 millilitres.

5 ml = 1.01442 tsp. There are 1.01442 US teaspoons in 5 millilitres.

10 ml = 2.02884 tsp. There are 2.02884 US teaspoons in 10 millilitres.

15 ml = 3.04326 tsp. There are 3.04326 US teaspoons in 15 millilitres.

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How the Teaspoons To Ml works

This teaspoons to ml converter uses the US teaspoon of 4.93 ml, the spoon in American recipes. Type a number of teaspoons, including fractions such as 0.25, and the millilitres appear as you type. The explainer and table also give the 5 ml metric teaspoon used almost everywhere else and on medicine spoons. Press the swap button to turn millilitres into teaspoons.

Teaspoons measure the small, strong ingredients in a recipe: salt, baking soda, spices, vanilla and yeast. They are also the standard unit for liquid medicines. The good news is that the teaspoon is far more consistent than the cup or tablespoon. The US teaspoon and the metric teaspoon differ by only 1.4%, which no kitchen spoon can measure.

Teaspoons to ml: US and metric

US teaspoon: a third of a US tablespoon, exactly 4.92892159375 ml. This converter uses it.
Metric teaspoon: exactly 5 ml, used in the UK, Europe, Australia, Canada and New Zealand, and the size of every medicine spoon and oral syringe marking.
US labelling teaspoon: US nutrition labels round the teaspoon to exactly 5 ml.

The formula

ml = teaspoons × 4.92892159375, and teaspoons = ml ÷ 4.92892159375. For a metric teaspoon, multiply or divide by 5.

Worked examples

The first example is 1½ teaspoons of vanilla extract in a US cookie recipe. 1.5 × 4.93 = 7.4 ml, which a 7.5 ml measure covers.

The second example goes the other way. A dose of 2.5 ml of liquid paracetamol is 2.5 ÷ 4.93 = 0.51 US teaspoon, or exactly half a 5 ml medicine spoon.

A third example: a quarter teaspoon of salt is 1.23 ml, close to the 1.25 ml spoon found in most measuring sets.

How many ml in a teaspoon, and in common measures

There are 4.93 ml in a US teaspoon and 5 ml in a metric teaspoon. The table gives both, with the equivalent in tablespoons, since three teaspoons make one tablespoon.

Teaspoon measures in US and metric millilitres

Teaspoons	US (ml)	Metric (ml)	Tablespoons
1/8	0.6	0.625	0.04
1/4	1.2	1.25	0.08
1/2	2.5	2.5	0.17
3/4	3.7	3.75	0.25
1	4.9	5	0.33
1 1/4	6.2	6.25	0.42
1 1/2	7.4	7.5	0.50
1 3/4	8.6	8.75	0.58
2	9.9	10	0.67
2 1/2	12.3	12.5	0.83
3	14.8	15	1.00
4	19.7	20	1.33
5	24.6	25	1.67
6	29.6	30	2.00
8	39.4	40	2.67
10	49.3	50	3.33
12	59.1	60	4.00
15	73.9	75	5.00
16	78.9	80	5.33
20	98.6	100	6.67
24	118.3	120	8.00

How to read the result

tsp equals gives the volume in millilitres. One decimal place is plenty for cooking.
Conversion shows the factor, 1 tsp = 4.9289 ml. After a swap it reads 1 ml = 0.2029 tsp.
Inverse gives the factor for the opposite direction.

Tips and pitfalls

Use a syringe for medicine. Kitchen teaspoons hold anywhere from 2.5 to 7 ml. Health services advise measuring liquid medicines with the oral syringe or spoon supplied.
Level dry ingredients. Sweep a knife across the spoon. A heaped teaspoon of baking powder can be double the intended amount.
Three to a tablespoon. For larger amounts, switch to the tablespoons to ml converter.
Don't bother converting tiny amounts. A pinch or a dash is under a quarter teaspoon, and the US and metric difference is a fraction of a drop.

FAQ

How many ml is a teaspoon?

A US teaspoon is 4.93 ml and a metric teaspoon is exactly 5 ml. The difference is too small to measure with a kitchen spoon, so 5 ml is the standard working figure for cooking and for medicine doses everywhere.

How many teaspoons is 5 ml?

5 ml is 1.01 US teaspoons, or exactly one metric teaspoon. Medicine labels that say 5 ml mean one 5 ml spoon or syringe dose, not a spoon from the cutlery drawer, which can hold much more or less.

How many ml is half a teaspoon?

Half a US teaspoon is 2.46 ml, and half a metric teaspoon is exactly 2.5 ml. Most measuring spoon sets include a 2.5 ml spoon, and oral syringes are marked at 2.5 ml for children's medicine doses.

How many teaspoons are in a tablespoon?

Three. A US tablespoon is three US teaspoons and a metric tablespoon is three 5 ml teaspoons. Australia is the exception, where a 20 ml tablespoon equals four 5 ml teaspoons, so check where a recipe comes from.

Is a teaspoon exactly 5 ml?

A metric teaspoon is exactly 5 ml. The US customary teaspoon is 4.93 ml, but US nutrition labels and medicine instructions round it to 5 ml, so for practical purposes a teaspoon is 5 ml everywhere.