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.
What is cubic centimetre?
A cubic centimetre is a metric unit of volume equal to one thousandth of a litre, or 1 millilitre. It is used in medicine, engine displacement specifications, and precise scientific measurements.
Real-world uses
Cubic centimetres are used for engine displacement (e.g., a 250 cc motorcycle engine), medical syringe volumes (often marked "cc"), and laboratory measurements. Small container volumes and 3D printing material estimates are expressed in cm³.
History
The cubic centimetre was the standard volume unit in the CGS system. The abbreviation "cc" became entrenched in automotive and medical fields. The JCAHO (now The Joint Commission) recommended against "cc" in medical prescriptions to reduce errors, though it persists.
Common mistakes
Using "cc" interchangeably with mL is technically acceptable (they are equal), but some medical institutions discourage "cc" because it can be misread as "00" in handwritten prescriptions.
When is this conversion used?
Converting between US gallon and cubic centimetre 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 US gallon = 3,785.411784 cubic centimetre
1 cubic centimetre = 0.001 litre
How to convert US gallon to cubic centimetre
To convert US gallon to cubic centimetre, multiply the value by 3,785.411784.
To convert cubic centimetre back to US gallon, multiply by 0.00026417.
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: US gallon to cubic centimetre
| US gallon | cubic centimetre |
|---|---|
| 0.1 | 378.5411784 |
| 0.5 | 1,892.705892 |
| 1 | 3,785.411784 |
| 2 | 7,570.823568 |
| 5 | 18,927.05892 |
| 10 | 37,854.11784 |
| 25 | 94,635.2946 |
| 50 | 189,270.5892 |
| 100 | 378,541.1784 |
| 250 | 946,352.946 |
| 500 | 1,892,705.892 |
| 1,000 | 3,785,411.784 |
Common values
| US gallon | cubic centimetre | |
|---|---|---|
| A teaspoon | 0.00132086 US gallon | 5 cubic centimetre |
| A cup of coffee | 0.06604301 US gallon | 250 cubic centimetre |
| A water bottle | 0.13208603 US gallon | 500 cubic centimetre |
| A bathtub | 79.25161571 US gallon | 300,000 cubic centimetre |
| A swimming pool (Olympic) | 660,430.13089537 US gallon | 2.500000e+09 cubic centimetre |
Available Volume units
More US gallon conversions
- Convert US gallon to litre
- Convert US gallon to millilitre
- Convert US gallon to cubic metre
- Convert US gallon to Imperial gallon
- Convert US gallon to US fluid ounce
- Convert US gallon to Imperial fluid ounce
- Convert US gallon to teaspoon (metric)
- Convert US gallon to tablespoon (metric)
- Convert US gallon to cubic centimetre