How many milliliters are in 1 us teaspoon?

1 tsp (US) equals 4.928921594 mL. This is an exact conversion factor defined by NIST.

How do I convert us teaspoons to milliliters?

Multiply the value in tsp (US) by the conversion factor. For example, 10 tsp (US) = 49.28921594 mL. Use our calculator above for instant results.

Is the us teaspoons to milliliters conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert us teaspoons to milliliters offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between us teaspoons and milliliters?

US Teaspoons (tsp (US)) and Milliliters (mL) are both units of volume but belong to different measurement systems. 1 tsp (US) = 4.928921594 mL. Use the converter above to switch between them instantly.

US Teaspoons to Milliliters (tsp (US) → mL) — Free Online Converter

tsp (US) → mL Reference Table

tsp (US)	mL
0.001 tsp (US)	0.004928921594 mL
0.002 tsp (US)	0.009857843187 mL
0.003 tsp (US)	0.01478676478 mL
0.004 tsp (US)	0.01971568637 mL
0.005 tsp (US)	0.02464460797 mL
0.006 tsp (US)	0.02957352956 mL
0.007 tsp (US)	0.03450245116 mL
0.008 tsp (US)	0.03943137275 mL
0.009 tsp (US)	0.04436029434 mL
0.01 tsp (US)	0.04928921594 mL
0.02 tsp (US)	0.09857843187 mL
0.03 tsp (US)	0.1478676478 mL
0.04 tsp (US)	0.1971568637 mL
0.05 tsp (US)	0.2464460797 mL
0.06 tsp (US)	0.2957352956 mL
0.07 tsp (US)	0.3450245116 mL
0.08 tsp (US)	0.3943137275 mL
0.09 tsp (US)	0.4436029434 mL
0.1 tsp (US)	0.4928921594 mL
0.2 tsp (US)	0.9857843188 mL
0.3 tsp (US)	1.478676478 mL
0.4 tsp (US)	1.971568638 mL
0.5 tsp (US)	2.464460797 mL
0.6 tsp (US)	2.957352956 mL
0.7 tsp (US)	3.450245116 mL
0.8 tsp (US)	3.943137275 mL
0.9 tsp (US)	4.436029434 mL
1 tsp (US)	4.928921594 mL
1.5 tsp (US)	7.393382391 mL
2 tsp (US)	9.857843188 mL
2.5 tsp (US)	12.32230398 mL
3 tsp (US)	14.78676478 mL
3.5 tsp (US)	17.25122558 mL
4 tsp (US)	19.71568638 mL
4.5 tsp (US)	22.18014717 mL
5 tsp (US)	24.64460797 mL
5.5 tsp (US)	27.10906877 mL
6 tsp (US)	29.57352956 mL
6.5 tsp (US)	32.03799036 mL
7 tsp (US)	34.50245116 mL
7.5 tsp (US)	36.96691195 mL
8 tsp (US)	39.43137275 mL
8.5 tsp (US)	41.89583355 mL
9 tsp (US)	44.36029434 mL
9.5 tsp (US)	46.82475514 mL
10 tsp (US)	49.28921594 mL
11 tsp (US)	54.21813753 mL
12 tsp (US)	59.14705912 mL
13 tsp (US)	64.07598072 mL
14 tsp (US)	69.00490231 mL
15 tsp (US)	73.93382391 mL
16 tsp (US)	78.8627455 mL
17 tsp (US)	83.79166709 mL
18 tsp (US)	88.72058869 mL
19 tsp (US)	93.64951028 mL
20 tsp (US)	98.57843187 mL
25 tsp (US)	123.2230398 mL
30 tsp (US)	147.8676478 mL
35 tsp (US)	172.5122558 mL
40 tsp (US)	197.1568637 mL
45 tsp (US)	221.8014717 mL
50 tsp (US)	246.4460797 mL
55 tsp (US)	271.0906877 mL
60 tsp (US)	295.7352956 mL
65 tsp (US)	320.3799036 mL
70 tsp (US)	345.0245116 mL
75 tsp (US)	369.6691195 mL
80 tsp (US)	394.3137275 mL
85 tsp (US)	418.9583355 mL
90 tsp (US)	443.6029434 mL
95 tsp (US)	468.2475514 mL
100 tsp (US)	492.8921594 mL
120 tsp (US)	591.4705912 mL
125 tsp (US)	616.1151992 mL
130 tsp (US)	640.7598072 mL
140 tsp (US)	690.0490231 mL
150 tsp (US)	739.3382391 mL
160 tsp (US)	788.627455 mL
175 tsp (US)	862.5612789 mL
180 tsp (US)	887.2058869 mL
200 tsp (US)	985.7843187 mL
225 tsp (US)	1109.007359 mL
250 tsp (US)	1232.230398 mL
275 tsp (US)	1355.453438 mL
300 tsp (US)	1478.676478 mL
350 tsp (US)	1725.122558 mL
400 tsp (US)	1971.568637 mL
450 tsp (US)	2218.014717 mL
500 tsp (US)	2464.460797 mL
600 tsp (US)	2957.352956 mL
700 tsp (US)	3450.245116 mL
750 tsp (US)	3696.691195 mL
800 tsp (US)	3943.137275 mL
900 tsp (US)	4436.029434 mL
1000 tsp (US)	4928.921594 mL
1200 tsp (US)	5914.705912 mL
1250 tsp (US)	6161.151992 mL
1500 tsp (US)	7393.382391 mL
1750 tsp (US)	8625.612789 mL
2000 tsp (US)	9857.843188 mL
2500 tsp (US)	12322.30398 mL
3000 tsp (US)	14786.76478 mL
4000 tsp (US)	19715.68638 mL
4500 tsp (US)	22180.14717 mL
5000 tsp (US)	24644.60797 mL
6000 tsp (US)	29573.52956 mL
7000 tsp (US)	34502.45116 mL
7500 tsp (US)	36966.91195 mL
8000 tsp (US)	39431.37275 mL
9000 tsp (US)	44360.29434 mL
10000 tsp (US)	49289.21594 mL
15000 tsp (US)	73933.82391 mL
20000 tsp (US)	98578.43187 mL
25000 tsp (US)	123223.0398 mL
50000 tsp (US)	246446.0797 mL
75000 tsp (US)	369669.1195 mL
100000 tsp (US)	492892.1594 mL

Values based on NIST SP 811 conversion factors

Why Convert US Teaspoons to Milliliters?

Converting between us teaspoons (tsp (US)) and milliliters (mL) is one of the most common volume conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert tsp (US) to mL saves time and prevents errors.

Volume conversions (tsp (US) to mL) play a key role in the automotive industry, cooking, and chemical manufacturing. Drivers comparing engine displacement or fuel tank capacity need clear conversions to understand vehicle performance and range. In the kitchen, converting liquid ingredients like milk, oil, or broth is essential when adapting recipes from different regions. For industrial applications, mixing chemical solutions requires exact volume measurements to maintain product stability and safety. An error in volume conversion can lead to mechanical failures, ruined culinary creations, or hazardous chemical reactions, making precision indispensable.

How to Convert US Teaspoons to Milliliters

To convert us teaspoons to milliliters, use the following formula:

mL = tsp (US) × 4.928921594

Example: 1 tsp (US) = 4.928921594 mL

For example, 5 tsp (US) = 24.64460797 mL, 10 tsp (US) = 49.28921594 mL, and 100 tsp (US) = 492.8921594 mL. For larger values, 1000 tsp (US) = 4928.921594 mL. Conversely, 1 mL = 0.2028841362 tsp (US). Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Mistakes to Avoid

Fluid vs Dry: confusing fluid pints/quarts with dry pints/quarts.
US vs Imperial: US gallons are smaller than UK Imperial gallons.
Cubic conversion: forgetting to cube linear factors (1 m = 100 cm, 1 m³ = 1,000,000 cm³).

Pro Tips

Cooking spoon: 1 Tablespoon = 3 Teaspoons = 15 ml.
Cup size: A standard US cup is 240ml, but metric cup is often 250ml.
Cube visual: 1 cubic meter is a box 1m x 1m x 1m (huge!).

What is a US Teaspoon?

A US unit of volume for cooking, equal to 1/3 of a tablespoon.

Standard culinary measure for small quantities.

What is a Milliliter?

The milliliter (mL) is a metric unit of volume equal to one-thousandth of a liter. One milliliter occupies the same volume as one cubic centimeter.

Milliliters are used globally for measuring small amounts of liquid, dosages of medicine, beverage packaging, and cooking ingredients.

US Teaspoons → Milliliters

US Teaspoons to Milliliters Formula