Volume Converter
Convert volume between U.S. cups, teaspoons, tablespoons, fluid ounces, pints, quarts, gallons, milliliters, and liters.
What is a volume converter?
The volume converter switches between U.S. cooking and liquid measurements and metric units — every unit you will see on a U.S. recipe or beverage label.
Note: this uses U.S. customary units, not imperial. 1 US gallon = 3.785 L, while 1 imperial (UK) gallon = 4.546 L. They are not the same.
Formula
All conversions go through milliliters using exact factors:
- 1 US tsp = 4.92892159375 mL, 1 US tbsp = 3 tsp
- 1 US fl oz = 2 tbsp, 1 US cup = 8 fl oz = 236.588 mL
- 1 US pint = 2 cups, 1 US quart = 2 pints, 1 US gallon = 4 quarts = 3.785 L
Worked example
Convert 1 US cup:
- = 8 fl oz
- = 16 tablespoons
- = 48 teaspoons
- = 236.59 mL
- = 0.25 quarts
How to use this calculator
- Enter a quantity.
- Pick the unit you have.
- Read off any other unit — all nine appear at once.
Frequently asked questions
Is a US cup the same as a metric cup?
No. A U.S. cup is 236.59 mL; a metric cup (used in Australia and some international recipes) is exactly 250 mL. A "legal" cup on U.S. nutrition labels is also 240 mL. For American recipes, use the default U.S. cup in this calculator.
What about dry measurements like flour?
These are volume units. A cup of flour weighs differently than a cup of sugar because density varies. If you need to convert by weight, you need ingredient-specific density data (typically 125 g/cup for all-purpose flour, 200 g/cup for granulated sugar, and so on).
Is a fluid ounce the same as an ounce?
No. A fluid ounce is a volume unit; an ounce is a weight unit. A fluid ounce of water weighs approximately one ounce, which is probably where the confusion comes from.
Why is 1 gallon exactly 231 cubic inches?
The U.S. gallon was defined in 1707 as the volume of a cylinder 7 inches in diameter and 6 inches high, giving 230.907 cubic inches — rounded to 231. It has stayed there ever since.