Volume Converter
Convert liters, gallons, cups and cooking spoons with exact US/imperial definitions — baking math without the guesswork.
| Reference | Exact value |
|---|---|
| 1 US gallon | 3.785411784 L |
| 1 imperial gallon | 4.54609 L |
| 1 cup | 0.2365882365 L |
| 1 cubic foot | 28.316846592 L |
How to use
- Type a volume and pick the from/to units.
- The result updates live as you type.
- Hit ⇅ to swap units and invert the conversion.
Frequently asked questions
Which volume units are supported?
Fourteen: liter, milliliter, cubic meter, cubic centimeter, cubic foot, cubic inch, US gallon, quart, pint, cup, fluid ounce, tablespoon, teaspoon and the imperial gallon. Liters are the base unit.
Why is a US gallon different from an imperial gallon?
The US gallon (3.785411784 L) is defined from the wine gallon of 231 cubic inches. The imperial gallon (4.54609 L) was later defined in Britain from the volume of 10 pounds of water — about 20% larger. Recipes from the two countries do not mix!
Are US cups and tablespoons exact?
In US customary use: 1 cup = 8 fl oz = 16 tablespoons = 48 teaspoons, all derived exactly from the US gallon. Metric-only countries use a rounded 250 mL cup, which is a different convention.
How many mL in a teaspoon?
A US teaspoon is exactly 4.92892159375 mL, usually rounded to 5 mL in medicine and cooking. For dosing medicine, use the rounded figure only when the label says metric teaspoons.
Does a cubic centimeter equal a milliliter?
Yes — 1 cm³ = 1 mL exactly, which is why engine displacements in cc and syringe volumes in mL describe the same quantity. The converter treats them as two keys for the same factor.