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The Volume Converter makes it easy to convert liquid and dry volume measurements between the most common units used in cooking, science, and everyday life. From converting liters to gallons at the gas station to translating cups to milliliters in a recipe, this tool provides accurate, instant results across all major volume units.
Volume measurement can be confusing because multiple competing systems exist: the metric system (liters, milliliters), the US customary system (gallons, quarts, pints, cups, fluid ounces), and the UK imperial system (which uses different gallon and pint sizes). This converter uses US customary units, which are standard in American recipes and product labels.
Whether you are a home cook scaling a recipe, a student working on a chemistry problem, a traveler comparing fuel prices across countries, or a professional in food service or pharmaceuticals, accurate volume conversion is an essential daily skill. Our converter handles all these scenarios simultaneously.
All inputs are converted to liters as the base unit, then converted to each output. US customary volume units relate to liters as follows:
Output conversions from liters:
These values are based on the US customary system definitions as standardized by NIST.
Volume results should be interpreted based on your application. In cooking, 1 cup (about 237 mL) is the standard US measure; 1 tablespoon = 3 teaspoons = 14.79 mL. For beverages, a standard can is 355 mL (12 fl oz); a 2-liter soda bottle is about 0.528 gallons or 67.6 fl oz. For fuel, 1 US gallon = 3.785 liters — relevant for comparing gas prices internationally. For scientific use, milliliters and liters are the standard; 1 mL of water weighs approximately 1 gram at room temperature.
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2 liters is approximately 8.45 US cups — useful when a European recipe calls for liters but your measuring tools use cups.
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1 US gallon = exactly 128 fluid ounces = 16 cups = 3,785.4 mL. This relationship is useful for large-batch cooking and beverage service.
There are approximately 4.227 US cups in one liter (since 1 US cup = 236.588 mL). If you need a quick approximation, use 4 cups per liter for mental math, though for baking precision use the exact value.
A US gallon = 3.78541 liters (128 US fl oz), while a UK (imperial) gallon = 4.54609 liters (160 UK fl oz). This difference of about 20% is important when comparing fuel economy or purchasing large quantities of liquids internationally. This converter uses US gallons.
Multiply US fluid ounces by 29.5735 to get milliliters. For example, 8 fl oz = 236.6 mL (approximately 1 US cup). Note that 1 US fluid ounce ≠ 1 UK fluid ounce (UK fl oz = 28.4131 mL).
The US and UK systems diverged historically. The US retained older English measurements after independence, while the UK standardized its own imperial system in 1824. The result is that US and UK gallons, pints, and fluid ounces all have different sizes, even though they share the same names.
One US cup = 236.588 mL exactly (defined as 8 US fluid ounces). In cooking, this is often rounded to 240 mL for convenience. Note: a metric cup (used in Australia and Canada) = 250 mL.
Divide the number of liters by 3.78541 to get US gallons. For example, a 50-liter fuel tank holds about 13.21 US gallons. To convert fuel efficiency, use: mpg = 235.215 / (L per 100 km).
Roboculator Team
The Roboculator Team explains calculations, planning tools, and practical formulas in clear language for real-life situations.
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