How many mL in a teaspoon

A US teaspoon is 4.93 milliliters: type teaspoons, pick the spoon standard, get milliliters.

1 tsp

4.93 mL

US cup of 236.6 mL

How this is measured

Exact by definition: 1 US cup = 8 US fl oz = 236.5882365 mL; 1 tbsp = 1/16 cup, 1 tsp = 1/48 cup. Source: NIST Handbook 44, Appendix C.

How many mL in a teaspoon

A teaspoon is a unit of volume, and 1 teaspoon in US measures is 4.93 milliliters: NIST Handbook 44 defines the measuring teaspoon as ⅓ tablespoon exactly, 1/48 of the US cup of 236.6 milliliters. The teaspoon on US nutrition labels is 5 milliliters (21 CFR 101.9), and so is a metric teaspoon (NIST Special Publication 430), the spoon of recipes written in metric units. Pick the standard under "Cups and spoons" in the converter.

Tsp to mL conversion chart

Teaspoon counts and fractions in milliliters for each standard:

US customary spoons by NIST; the 15 mL tablespoon and 5 mL teaspoon of US nutrition labels and metric spoons; imperial spoons as 1/16 and 1/48 of the imperial cup.

Teaspoons to milliliters in each standard
Teaspoons	US (mL)	Label and metric (mL)	Imperial (mL)
⅛ tsp	0.616 mL	0.625 mL	0.74 mL
¼ tsp	1.23 mL	1.25 mL	1.48 mL
½ tsp	2.46 mL	2.5 mL	2.96 mL
¾ tsp	3.7 mL	3.75 mL	4.44 mL
1 tsp	4.93 mL	5 mL	5.92 mL
1½ tsp	7.39 mL	7.5 mL	8.88 mL
2 tsp	9.86 mL	10 mL	11.84 mL
3 tsp	14.79 mL	15 mL	17.76 mL
4 tsp	19.72 mL	20 mL	23.68 mL
5 tsp	24.64 mL	25 mL	29.6 mL
6 tsp	29.57 mL	30 mL	35.52 mL

How to convert teaspoons to milliliters

Multiply the teaspoons by the milliliters in one teaspoon: 3 US teaspoons, one tablespoon, are 14.79 milliliters, and 6 teaspoons, which make 1 fluid ounce, are 29.57 milliliters. With 5 mL spoons the arithmetic is whole: ½ teaspoon is 2.5 milliliters, 2 teaspoons 10 milliliters.

mL to teaspoons conversion table

Milliliters to US teaspoons and tablespoons, with the spoons to fill:

US customary spoons, 1/48 and 1/16 of the US cup. ≈ marks the nearest measure you can fill.

Milliliters to US teaspoons and tablespoons
Milliliters	Teaspoons	Tablespoons	Measure to fill
1 mL	0.203 tsp	0.0676 tbsp	≈ ¼ tsp
2 mL	0.406 tsp	0.135 tbsp	≈ ¼ tsp + ⅛ tsp
2.5 mL	0.507 tsp	0.169 tbsp	≈ ½ tsp
5 mL	1.01 tsp	0.338 tbsp	≈ 1 tsp
7.5 mL	1.52 tsp	0.507 tbsp	≈ 1 tsp + ½ tsp
10 mL	2.03 tsp	0.676 tbsp	≈ 2 tsp
15 mL	3.04 tsp	1.01 tbsp	≈ 1 tbsp
20 mL	4.06 tsp	1.35 tbsp	≈ 1 tbsp + 1 tsp
25 mL	5.07 tsp	1.69 tbsp	≈ 1 tbsp + 2 tsp
30 mL	6.09 tsp	2.03 tbsp	≈ 2 tbsp
45 mL	9.13 tsp	3.04 tbsp	≈ 3 tbsp
60 mL	12.17 tsp	4.06 tbsp	≈ ¼ cup

Measuring spoons for cooking

In cooking, a measuring spoon gives the volume; fill liquids to the brim of a measuring spoon and level dry ingredients flat; the milliliters are the same either way. NIST Handbook 44 calls the teaspoon an imprecise unit and gives it as 5 milliliters, rounded to the nearest milliliter. A teaspoon from the cutlery drawer is not a measuring spoon, and none of our sources defines its size.

For what a teaspoon of an ingredient weighs, see teaspoons to grams.

Questions

Is a teaspoon 5 mL?

A metric or US label teaspoon is exactly 5 milliliters; a US customary teaspoon is 4.93 milliliters.

How many teaspoons is 10 mL?

2 tsp with 5 mL spoons, 2.03 tsp with US spoons.

How many mL is ½ teaspoon?

2.46 milliliters in a US spoon, 2.5 milliliters in a 5 mL spoon.

How many mL are in a tablespoon?

Three teaspoons: 14.79 milliliters in US measure. The tablespoons to mL page has the chart.

Sources

21 CFR 101.9 (US nutrition labeling)
NIST Handbook 44, Appendix C
NIST Special Publication 430, Household Weights and Measures
Weights and Measures Act 1985 (UK), Schedule 1