Convert between metric and US customary volume units including gallons, quarts, pints, cups, fluid ounces, tablespoons, and teaspoons.
American cooking and everyday life rely on US customary volume units – teaspoons, tablespoons, cups, pints, quarts, and gallons. These differ from both metric units and the UK imperial system, which can cause confusion when following international recipes or filling up a vehicle abroad.
This converter covers all 22 common volume units, including US dry measures used for produce and grain. Whether you're scaling a recipe, calculating fuel costs, or comparing beverage sizes, instant results are just a click away.
All conversions use the liter (L) as the pivot unit. To convert from unit A to unit B, the value is first converted to liters, then from liters to the target unit.
Conversion formula
Where V_A is the value in the source unit, f_A is the factor to convert that unit to liters, and f_B is the factor to convert liters to the target unit.
A standard can of Coca-Cola, Pepsi, or beer holds 12 US fluid ounces – exactly 354.9 mL. Six-packs, twelve-packs, and cases are all based on this 12 fl oz standard size.
The classic red Solo cup is commonly marked at 12 oz (liquid) and 16 oz (total capacity). The 18 fl oz fill-to-rim volume equals about 532 mL or 0.53 liters.
A typical American sedan holds about 15 US gallons of fuel (56.8 L). An SUV or pickup truck may hold 20–30 gallons (75.7–113.6 L), making international fuel cost comparisons easy with this converter.
The iconic Big Gulp fountain drink holds 30 fl oz (887 mL), the Super Big Gulp 40 fl oz (1.18 L), and the Double Gulp a full 64 fl oz – just under half a US gallon (1.89 L).
Enter the volume value you want to convert in the input field.
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Expand the Metric, US Liquid, or Other Units sections to see all 22 units.
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1 US gallon = 4 quarts = 8 pints = 16 cups = 128 fluid ounces.
A US cup is 236.6 mL; a legal cup (nutrition labels) is 240 mL; a metric cup is 250 mL.
US and UK gallons are different: 1 US gallon = 3.785 L, but 1 UK gallon = 4.546 L – about 20% more.
US dry units are larger than liquid units: a dry pint is 550.6 mL vs. a liquid pint of 473.2 mL.
There are 3 teaspoons per tablespoon and 16 tablespoons per cup in the US system.
There are 16 US cups in 1 US gallon. The sequence is: 1 gallon = 4 quarts = 8 pints = 16 cups = 128 fluid ounces = 256 tablespoons = 768 teaspoons.
One US liquid gallon equals exactly 3.785411784 liters. This is defined by the international yard-pound agreement. A US gallon is smaller than a UK imperial gallon, which is 4.54609 liters.
A fluid ounce (fl oz) measures volume, while a regular ounce (oz) measures weight (mass). One US fluid ounce equals 29.574 mL. They are not directly interchangeable; the actual weight of 1 fl oz of liquid depends on the density of that liquid.
The US liquid pint (473.2 mL) is used for liquids like beer, milk, and juice. The US dry pint (550.6 mL) is used to measure dry goods such as blueberries, strawberries, and other produce sold by volume in baskets.
A US customary cup is 236.588 mL. The US legal cup used on nutrition labels is 240 mL. A metric cup (used in Australia, Canada, NZ) is 250 mL. When following an Australian recipe, your cup measurements will be slightly off if using US cups.
There are 16 US tablespoons in 1 US cup. Each tablespoon equals 3 teaspoons, so 1 cup equals 48 teaspoons. For metric cooking, 1 tablespoon is typically standardised at 15 mL (Australia uses 20 mL).
Conversion factors are based on US customary units as defined by the National Institute of Standards and Technology (NIST). US and UK units differ in size; verify which system your recipe or specification uses.