Milliliters to Teaspoons Converter (mL to tsp)

How to convert milliliters to U.S. teaspoons

To convert milliliters to U.S. teaspoons, multiply the number of milliliters by 0.20288 (or divide by 4.929).

Example: 10 mL = 2.029 tsp.

Liquid medicine for children is often measured in mL; ask a pharmacist before converting a dose.

Milliliters to Teaspoons conversion chart

mL	tsp
0.25 mL	0.05072 tsp
0.5 mL	0.10144 tsp
0.75 mL	0.15216 tsp
1 mL	0.20288 tsp
1.5 mL	0.30433 tsp
2 mL	0.40577 tsp
2.5 mL	0.50721 tsp
3 mL	0.60865 tsp
3.5 mL	0.71009 tsp
4 mL	0.81154 tsp
4.5 mL	0.91298 tsp
5 mL	1.014 tsp
6 mL	1.217 tsp
7 mL	1.42 tsp
8 mL	1.623 tsp
9 mL	1.826 tsp
10 mL	2.029 tsp
11 mL	2.232 tsp
12 mL	2.435 tsp
13 mL	2.637 tsp
14 mL	2.84 tsp
15 mL	3.043 tsp
16 mL	3.246 tsp
18 mL	3.652 tsp
20 mL	4.058 tsp
24 mL	4.869 tsp
25 mL	5.072 tsp
30 mL	6.087 tsp
32 mL	6.492 tsp
35 mL	7.101 tsp
40 mL	8.115 tsp
45 mL	9.13 tsp
50 mL	10.144 tsp
55 mL	11.159 tsp
60 mL	12.173 tsp
64 mL	12.985 tsp
65 mL	13.187 tsp
70 mL	14.202 tsp
75 mL	15.216 tsp
80 mL	16.231 tsp
85 mL	17.245 tsp
90 mL	18.26 tsp
100 mL	20.288 tsp
110 mL	22.317 tsp
120 mL	24.346 tsp
125 mL	25.361 tsp
128 mL	25.969 tsp
150 mL	30.433 tsp
175 mL	35.505 tsp
180 mL	36.519 tsp
200 mL	40.577 tsp
220 mL	44.635 tsp
250 mL	50.721 tsp
300 mL	60.865 tsp
400 mL	81.154 tsp
500 mL	101.44 tsp
750 mL	152.16 tsp
1,000 mL	202.88 tsp

Metric vs. U.S. customary units

The United States uses U.S. customary units — inches, feet, miles, pounds, gallons and degrees Fahrenheit — for most everyday purposes. Canada officially adopted the metric system in the 1970s, so road signs, weather forecasts, gas pumps and food labels use kilometers, degrees Celsius, liters and grams. In practice many Canadians still use feet and inches for height, pounds for body weight and square feet for homes, which is why conversions come up constantly on both sides of the border.

Exact conversion factors

Since 1959 the inch, foot, yard, mile and pound have been defined in metric terms, so these conversions are exact, not approximations:

1 inch = 2.54 cm exactly, so 1 foot = 30.48 cm and 1 mile = 1.609344 km.
1 pound = 0.45359237 kg exactly; 1 ounce = 28.349523125 g.
1 U.S. gallon = 3.785411784 liters. The imperial gallon used in the U.K. is larger: 4.54609 liters.
1 acre = 4,046.8564224 m², and 1 hectare = 10,000 m² (about 2.471 acres).

Temperature is different because the scales have different zero points: °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9. Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F) at sea level, and −40 is the same in both scales.

Quick mental shortcuts

Kilometers to miles: multiply by 0.6 (100 km ≈ 60 miles; the exact figure is 62.1).
Kilograms to pounds: double it and add 10% (70 kg → 140 + 14 = 154 lb).
Celsius to Fahrenheit: double it and add 30 for a rough estimate (20 °C → 70 °F; the exact answer is 68 °F).
Liters to U.S. gallons: divide by 4 for a quick estimate (40 L ≈ 10 gallons; exactly 10.57).

Cooking and recipe conversions

U.S. recipes measure by volume — cups, tablespoons and teaspoons — while Canadian and most international recipes use milliliters and grams. A U.S. cup is about 237 mL, but Canadian "metric" measuring cups hold 250 mL, so the difference adds up in baking. For flour, sugar and butter, weighing in grams is more accurate than cups because the density of each ingredient differs.

Popular conversions

Pick a conversion below for a dedicated page with the formula, worked examples and a complete conversion chart.

Tips for accurate conversions

Keep full precision until the final step and round only the answer — rounding intermediate numbers can add noticeable errors, especially in recipes, construction and engineering. Always check which gallon, ounce or ton a source means: U.S. and imperial units share names but not sizes, and a "fluid ounce" measures volume while an "ounce" of weight measures mass. For temperatures, remember that a temperature difference converts differently from a temperature reading: a change of 10 °C equals a change of 18 °F, without adding 32.

Popular unit conversions

Frequently asked questions

How many centimeters are in an inch?

Exactly 2.54 centimeters. To convert inches to centimeters, multiply by 2.54; to convert centimeters to inches, divide by 2.54.

How do I convert kg to pounds?

Multiply kilograms by 2.20462. For example, 70 kg × 2.20462 = 154.3 lb.

What is the formula for Celsius to Fahrenheit?

Multiply by 9/5 (1.8) and add 32. For example, 25 °C × 1.8 + 32 = 77 °F.

Is a U.S. gallon the same as a Canadian gallon?

No. Canada sells gas by the liter, but when gallons are mentioned in Canada they are sometimes imperial gallons (4.546 L), which are about 20% larger than U.S. gallons (3.785 L).

How many square feet are in a square meter?

About 10.764 square feet. A 1,000 sq ft home is roughly 92.9 m².

Sources & methodology

This calculator was last reviewed on November 2, 2026. Figures are based on the following official and primary sources:

NIST – Handbook 44, Appendix C: General Tables of Units of Measurement

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