Volume Converter

Volume unit conversion for liters, milliliters, gallons, cups, and more

This Volume Converter helps you convert one volume measurement into another without guessing or hunting for tables. You enter a number, choose the unit you have, choose the unit you want, and the calculator gives you the converted amount. It is useful for cooking, baking, DIY mixing, aquariums, fuel or fluid container sizing, lab work, and general unit cleanup when you are reading instructions from another country.

Volume conversions get messy because different systems are mixed together. Metric units are straightforward, but recipes and packaging often use US customary units or UK imperial units, and they do not match each other. A US gallon is smaller than an imperial gallon, and the same problem shows up with pints and fluid ounces. If you only convert by memory, you will eventually get caught by a US versus UK mismatch. This calculator makes those choices explicit so you can pick the correct unit and avoid wrong results.

To use the calculator, type the value you already have into the Value box. Then pick the From unit to match that value. Next pick the To unit you want to convert into. Press Convert to see the result. If you picked the units the wrong way around, use Swap units to flip them without re-entering anything. The output shows a rounded value for quick reading, plus a higher-precision value when you need a more exact figure.

Assumptions and how to use this calculator

• This calculator converts volume only. It does not convert mass or weight. A cup of flour and a cup of water do not weigh the same.
• US customary and UK imperial units are treated as different units. If you are converting gallons, pints, or fluid ounces, choose the correct system.
• Cubic centimeters (cm³) are treated as equal to milliliters (mL). This is a standard equivalence used in science and engineering.
• The main displayed result is rounded to two decimals for readability. A higher-precision value is also shown for cases where rounding matters.
• If you are working from a recipe, packaging label, or online source, verify whether it uses US or UK units before converting.

Common questions

What is the difference between US and imperial gallons?

They are different sizes. A US gallon is about 3.785 liters, while an imperial (UK) gallon is about 4.546 liters. If you convert between gallons and liters, choosing the wrong gallon type will produce a noticeable error.

Are milliliters and cubic centimeters always the same?

For volume conversion, yes. One milliliter equals one cubic centimeter. You will often see this used in medical dosing, lab containers, and engineering drawings.

Why does the calculator show a rounded value and a higher-precision value?

Most day-to-day tasks do not need many decimal places, so a two-decimal result is easier to read. Some tasks do need more precision, such as lab measurements or when you are scaling a recipe. The higher-precision line lets you use the same conversion without losing detail too early.

Can this convert cups and tablespoons accurately?

It converts volume units based on standard US measuring definitions. That is accurate for volume as a unit, but it cannot guarantee how a specific ingredient behaves in a cup. Ingredients can pack differently, and recipes can vary by region. If your recipe is from the US, the US cup and spoon conversions are usually the correct choice.

Why does my result look wrong when converting a recipe?

The most common reason is a system mismatch, such as using imperial units for a US recipe or vice versa. Another common issue is confusing fluid ounces with ounces by weight. This tool converts fluid volume units only, so make sure the source unit is a volume measurement.