Volume Converter
Convert between liters, gallons, cups, ml, fluid ounces, and more.
Unit
Volume Converter
Generated on April 24, 2026
?What is the Volume Converter?
A volume converter handles capacity conversions across cooking (cups, tablespoons, teaspoons, fluid ounces), chemistry (milliliters, liters), fuel economy (gallons, liters), water tanks (cubic meters, gallons), and industrial use. One of the trickiest features of volume is that the US and UK gallons are not the same size — a common source of error in international recipes and specifications. This tool handles nine common units and clearly distinguishes US and UK gallons so you always get the right answer.
The Formula
The liter is the base volume unit in this converter. Every unit is stored as a factor to liters and conversions route through that base. US fluid ounces (29.5735 mL) are slightly larger than UK fluid ounces (28.4131 mL), and the US gallon is almost one-fifth smaller than the UK (imperial) gallon. Recipes from different regions may also define 'cup' differently — US cup = 237 mL, metric cup = 250 mL, Japanese cup = 200 mL. Always confirm the country of origin of a recipe before using its cup measurement literally.
Practical Examples
1 US gallon of milk equals 3.785 liters — useful when shopping in metric countries with US-brand recipes.
1 cup of water is approximately 237 mL in US measure (250 mL in metric measure) — a common source of baking inconsistency.
1 tablespoon equals 3 teaspoons equals 14.79 mL — the standard small-volume ratio in US recipes.
A UK gallon equals 1.2 US gallons — the same-named unit is noticeably different between the two systems.
A 2-liter soda bottle is 67.6 US fl oz — useful for comparing against US-brand bottled drinks.
A 1 m³ water tank holds 1,000 liters or 264 US gallons — important for sizing home storage tanks.