Volume Converter

Convert between liters, milliliters, gallons, ounces, cups, and other volume units instantly. Perfect for cooking, science experiments, and everyday measurements. Free tool.

How to Use

  1. Enter the volume value

    Type the volume value you want to convert.

  2. Select the units

    Choose the source unit (e.g., gallons) and the target unit (e.g., liters).

  3. View the result

    Click Convert to see the converted volume value.

What Is Volume Unit Conversion?

Volume conversion is the act of expressing the same amount of space using different units. The very same liter can be written as milliliters (mL) or cubic meters (m³) in the metric system, or as gallons, pints, cups, and ounces in the US customary system.

This converter handles 11 units, spanning metric units (mL, L, m³), US and UK units (gallon, pint, quart, fluid ounce), and cooking units (cup, tablespoon, teaspoon). It is especially handy whenever measurement systems get mixed up, such as following a foreign recipe, matching solution volumes in a chemistry experiment, or converting fuel economy from gallons to liters.

Calculation Formula

Every unit is first normalized to the base unit, liters (L), and then converted into the target unit.

result = value × (source factor) ÷ (target factor)

Each factor represents 'how many liters one unit equals.' For example, a US gallon is 3.78541 and a milliliter is 0.001. To convert 2 US gallons to milliliters: 2 × 3.78541 ÷ 0.001 = 7570.82 mL. Results are rounded to 6 decimal places.

Frequently Asked Questions

How many liters are in a gallon?
A US gallon is about 3.785 liters, while an Imperial (UK) gallon is about 4.546 liters. The Imperial gallon is roughly 20% larger than the US gallon. Always confirm which gallon a recipe or fuel figure refers to.
How many milliliters are in a liter?
One liter (L) equals exactly 1,000 milliliters (mL). Liters and milliliters are metric volume units, and one liter is the same as one cubic decimeter (dm³).
How many milliliters are in a cup?
This converter's cup is the US standard cup, about 236.588 mL. A metric cup, by contrast, is often 250 mL, so it is important to check which cup a foreign recipe assumes.
What is the relationship between cubic meters and liters?
One cubic meter (m³) equals exactly 1,000 liters (L). In other words, a cube measuring 1 m on each side has a volume of 1 m³, which is 1,000 L. Conversely, one liter equals one cubic decimeter (dm³).
How many milliliters are in a tablespoon and a teaspoon?
In US units, 1 tablespoon (tbsp) is about 14.79 mL and 1 teaspoon (tsp) is about 4.93 mL. This means 1 tablespoon equals exactly 3 teaspoons. These units are common in precise tasks like baking.
How do pints and quarts differ?
In US units, 1 pint (pt) is about 0.473 L and 1 quart (qt) is about 0.946 L, so 1 quart equals exactly 2 pints. Also, 1 gallon equals 4 quarts or 8 pints. Note that US and UK pint and quart values differ.
Is a fluid ounce the same as a weight ounce?
No. A fluid ounce is a unit of volume, about 29.57 mL in US units, while a weight ounce (oz) is a unit of mass, about 28.35 g. The names sound alike, but they measure entirely different physical quantities, so do not confuse them.
How are decimal places handled in the results?
This converter rounds the calculated result to 6 decimal places. As a result, it keeps enough precision even when converting between very small units (such as teaspoons) and large units (such as cubic meters).
2026 international standards

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