Convert volume units — liters, gallons, cups, milliliters, cubic meters, pints, quarts.
| Unit | Name | Value |
|---|---|---|
| L | Liter | 3.78541 |
| mL | Milliliter | 3785.41 |
| m³ | Cubic Meter | 0.00378541 |
| gal(UK) | UK Gallon | 0.83267379 |
| qt | US Quart | 3.9999979 |
| pt | US Pint | 8.0000042 |
| cup | US Cup | 16.000008 |
| fl oz | Fluid Ounce | 128.00007 |
Common us gallon values converted to us cup — factor: 1 gal = 16 cup
| US Gallon (gal) | US Cup (cup) | Context |
|---|---|---|
| 0.0078 gal | 0.1248 cup | Tablespoon |
| 0.031 gal | 0.496 cup | Quarter cup |
| 0.0625 gal | 1 cup | Cup |
| 0.125 gal | 2 cup | Pint |
| 0.25 gal | 4 cup | Quart |
| 0.5 gal | 8 cup | Half gallon |
| 1 gal | 16 cup | Gallon jug |
| 2 gal | 32 cup | Two gallons |
| 5 gal | 80 cup | Jerrycan |
| 10 gal | 160 cup | 10-gallon drum |
| 20 gal | 320 cup | 20-gallon tank |
| 42 gal | 672 cup | Oil barrel |
| 55 gal | 880 cup | Drum barrel |
| 100 gal | 1,600 cup | Large drum |
| 1,000 gal | 1.6e+04 cup | Tank |
Converting us gallon to us cup comes up frequently in cooking, chemistry, medicine, and engineering. A recipe written in metric units may need to be adapted for a kitchen using us cup, or a laboratory protocol may specify volumes in us gallon that need to be measured with equipment calibrated in us cup.
In everyday use, knowing that 5 gal = 80 cup and 10 gal = 160 cup covers most common situations. For bulk calculations, 100 gal = 1600 cup is a useful anchor. The reverse conversion — us cup back to us gallon — uses the factor 0.0625, so 1 cup = 0.0625 gal.
All conversions use the internationally recognized factor of exactly 1 gal = 16 cup. Calculations are performed in IEEE 754 double-precision floating point, giving accuracy to at least 8 significant figures — more than sufficient for any practical application.
Formula: US Cup = US Gallon × 16.000008
Multiply any us gallon value by 16.000008 to get us cup. One us gallon equals 16.000008 cup.
Reverse: US Gallon = US Cup × 0.062499967
US gallons × 16 = cups. One gallon = exactly sixteen cups.
0.25 gal = 4 cups = 1 qt, 0.5 gal = 8 cups.
Cups ÷ 16 = gallons.
Prices fuel in USD per gallon and tracks daily sales volume in thousands of gallons.
Calculates pesticide and fertilizer application rates in gallons per acre.
Measures pool volume in gallons to calculate chlorine and pH chemical dosages.
Purchases engine oil, transmission fluid, and coolant in quart and gallon containers.
Estimates coverage (one US gallon covers about 350 sq ft) and quotes by the gallon.
Specifies water heater tank capacity (40, 50, 80 gallons) for residential systems.
The US liquid gallon is defined as exactly 231 cubic inches, or 3.785411784 liters. It traces its origins to the Queen Anne wine gallon of 1707, which American colonies adopted.
The US gallon differs from the UK Imperial gallon by about 16.5%. This matters for fuel economy: a US MPG figure is lower than the equivalent UK MPG for the same car.
Interesting fact: The United States, Liberia, and Myanmar are the only countries using the US gallon as a primary everyday volume unit.
The US customary cup is defined as exactly 8 US fluid ounces, or 236.588 mL. It was standardized by Fannie Farmer in her 1896 cookbook The Boston Cooking-School Cook Book.
The cup is the backbone of US baking: nearly every American recipe uses cup measurements for flour, sugar, butter, and liquids. Standard sets include 1 cup, ½ cup, ⅓ cup, and ¼ cup.
Interesting fact: Australia uses a metric cup of 250 mL, slightly larger than the US cup, which can cause recipe confusion in international cooking.