What is millilitre?
A millilitre is a metric unit of volume equal to one thousandth of a litre. It is commonly used in medicine, cooking, laboratory measurements, and the labelling of food and beverage products.
Real-world uses
Millilitres are used for medication dosages (cough syrup, injectable solutions), cooking measurements, cosmetic product volumes, and laboratory reagent quantities. A standard medical syringe is graduated in mL, and espresso shots are typically 25–30 mL.
History
The millilitre emerged naturally from the litre with metric prefix conventions. It became essential in medicine and laboratory science where precise small-volume measurements are critical. In medical contexts, "cc" (cubic centimetre) was long used interchangeably with mL.
Common mistakes
Confusing millilitres with cubic centimetres—they are numerically equal (1 mL = 1 cm³) but conceptually different units. Also, mixing up mL with mg; one is volume, the other is mass.
What is US gallon?
A US gallon is a volume unit equal to 128 US fluid ounces, or approximately 3.785 litres. It is the standard unit for fuel, milk, and other liquid products in the United States.
Real-world uses
US gallons are used for fuel pricing and vehicle fuel economy (miles per gallon) in the United States. Milk, water, and paint are commonly sold in gallon containers. Pool volumes and water heater capacities are specified in gallons.
History
The US gallon is based on the English wine gallon of 231 cubic inches, which was defined by Queen Anne in 1707. When Britain adopted the Imperial gallon in 1824 (based on water weight), the US retained the older wine gallon standard.
Common mistakes
Confusing US gallons with Imperial gallons: a US gallon is about 3.785 litres while an Imperial gallon is about 4.546 litres—roughly 20% larger. This causes major confusion when comparing fuel economy between US and UK figures.
When is this conversion used?
Converting between millilitre and US gallon is common when working across metric and imperial systems, such as international trade, travel between countries with different measurement standards, or following instructions from a different region. Fuel economy, beverage volumes, and liquid measurements frequently require converting between litres and US gallons, especially for automotive and cooking contexts across different markets.
Worked examples
1 millilitre = 0.00026417 US gallon
1 US gallon = 3.78541178 litre
How to convert millilitre to US gallon
To convert millilitre to US gallon, multiply the value by 0.00026417.
To convert US gallon back to millilitre, multiply by 3,785.411784.
Measurement standards
The cubic metre is the SI derived unit of volume. The litre, equal to exactly one cubic decimetre (0.001 m³), is accepted by the BIPM for use alongside SI units. Both the lowercase "l" and uppercase "L" are approved symbols for the litre.
Did you know?
An Olympic swimming pool holds 2,500 cubic metres of water — about 2.5 million litres. The Amazon River discharges roughly 209,000 cubic metres per second, enough to fill 84 Olympic pools every single second.
Quick reference: millilitre to US gallon
| millilitre | US gallon |
|---|---|
| 0.1 | 0.00002642 |
| 0.5 | 0.00013209 |
| 1 | 0.00026417 |
| 2 | 0.00052834 |
| 5 | 0.00132086 |
| 10 | 0.00264172 |
| 25 | 0.0066043 |
| 50 | 0.0132086 |
| 100 | 0.02641721 |
| 250 | 0.06604301 |
| 500 | 0.13208603 |
| 1,000 | 0.26417205 |
Common values
| millilitre | US gallon | |
|---|---|---|
| A teaspoon | 5 millilitre | 0.00132086 US gallon |
| A cup of coffee | 250 millilitre | 0.06604301 US gallon |
| A water bottle | 500 millilitre | 0.13208603 US gallon |
| A bathtub | 300,000 millilitre | 79.25161571 US gallon |
| A swimming pool (Olympic) | 2.500000e+09 millilitre | 660,430.13089537 US gallon |
Available Volume units
More millilitre conversions
- Convert millilitre to litre
- Convert millilitre to US gallon
- Convert millilitre to cubic metre
- Convert millilitre to Imperial gallon
- Convert millilitre to US fluid ounce
- Convert millilitre to Imperial fluid ounce
- Convert millilitre to teaspoon (metric)
- Convert millilitre to tablespoon (metric)
- Convert millilitre to cubic centimetre