How many milliliters are in one US teaspoon?

There are 4.92892159 milliliters in 1 US teaspoon.

How do you convert milliliters to US teaspoons?

Multiply the number of milliliters by 0.202884136 — or use the formula tsp = mL ÷ 4.92892159.

What is 6 milliliters in US teaspoons?

6 milliliters is 1.21730482 US teaspoons. 6 ÷ 4.92892159 = 1.21730482 US teaspoons.

Is the milliliters to US teaspoons conversion exact?

Yes. The relationship is fixed by definition, so 0.202884136211 is an exact conversion factor — only the displayed result is rounded.

Milliliters to US Teaspoons Converter

Convert milliliters to US teaspoons instantly with this free milliliters to US teaspoons converter. Enter any value to get an accurate volume conversion, plus the formula, the conversion factor and a full reference table.

What is 1 milliliter in US teaspoons?

1 milliliter is equal to 0.202884136 US teaspoons.

1 ÷ 4.92892159 = 0.202884136 US teaspoons

Amount

Result0.2028841362

1 milliliter = 0.2028841362 US teaspoons

Milliliters to US teaspoons formula

tsp = mL ÷ 4.92892159

The milliliters to US teaspoons conversion factor is 0.202884136211, which is exact by definition. 1 milliliter = 0.202884136211 US teaspoons, and 1 US teaspoon = 4.92892159375 milliliters.

Worked examples

2 milliliters = 0.405768272 US teaspoons — 2 ÷ 4.92892159 = 0.405768272 US teaspoons
6 milliliters = 1.21730482 US teaspoons — 6 ÷ 4.92892159 = 1.21730482 US teaspoons
10 milliliters = 2.02884136 US teaspoons — 10 ÷ 4.92892159 = 2.02884136 US teaspoons

Milliliters to US teaspoons conversion table

Every value below is calculated with the exact conversion factor and rounded for display.

milliliters to US teaspoons conversion table
Milliliters (mL)	US teaspoons (tsp)
1 mL	0.20288414 tsp
2 mL	0.40576827 tsp
3 mL	0.60865241 tsp
4 mL	0.81153654 tsp
5 mL	1.0144207 tsp
6 mL	1.2173048 tsp
7 mL	1.420189 tsp
8 mL	1.6230731 tsp
9 mL	1.8259572 tsp
10 mL	2.0288414 tsp
12 mL	2.4346096 tsp
15 mL	3.043262 tsp
20 mL	4.0576827 tsp
25 mL	5.0721034 tsp
30 mL	6.0865241 tsp
50 mL	10.144207 tsp
75 mL	15.21631 tsp
100 mL	20.288414 tsp
500 mL	101.44207 tsp
1,000 mL	202.88414 tsp

When you need to convert milliliters to US teaspoons

Scaling recipes between metric millilitres and US cups, pints or fluid ounces.
Comparing fuel prices and tank capacities between countries.
Working out paint, fertiliser or pool chemical quantities from instructions written for another market.

Getting a feel for the scale

A converted number is easier to trust when you can picture it. These reference points let you sanity-check the result at a glance.

Milliliter (mL)

A teaspoon is about 5 mL
A shot of espresso is roughly 30 mL

Common mistakes to avoid

Dividing when you should multiply. Because 1 milliliter = 0.202884 US teaspoons, the answer should be smaller than the number you started with.
Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.

How precise does the answer need to be?

Cooking tolerates rounding to the nearest 5 mL or quarter cup. Dosing, chemistry and pool treatment do not — keep the full converted value there.

How these units are defined

Milliliter (mL): One thousandth of a liter, equal to one cubic centimeter. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
US teaspoon (tsp): One third of a US tablespoon, about 4.93 mL. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.

Frequently asked questions

What is 1 milliliter in US teaspoons?: 1 milliliter is equal to 0.202884136 US teaspoons.
How many milliliters are in one US teaspoon?: There are 4.92892159 milliliters in 1 US teaspoon.
How do you convert milliliters to US teaspoons?: Multiply the number of milliliters by 0.202884136 — or use the formula tsp = mL ÷ 4.92892159.
What is 6 milliliters in US teaspoons?: 6 milliliters is 1.21730482 US teaspoons. 6 ÷ 4.92892159 = 1.21730482 US teaspoons.
Is the milliliters to US teaspoons conversion exact?: Yes. The relationship is fixed by definition, so 0.202884136211 is an exact conversion factor — only the displayed result is rounded.