What is the difference between a US gallon and an Imperial gallon?

1 US gallon equals about 3.785 liters, while 1 Imperial (UK) gallon equals about 4.546 liters. The Imperial gallon is roughly 20% larger, so always pick the right one for the recipe or product label.

Why do US and UK fluid ounces differ?

1 US fluid ounce is about 29.57 mL, while 1 UK (Imperial) fluid ounce is about 28.41 mL. The two systems were defined separately, so the same name covers slightly different volumes.

Are milliliters and cubic centimeters the same thing?

Yes. 1 mL equals exactly 1 cm³ by definition. Most cooking and medical contexts use mL; engineering and physics often use cm³.

How do common cooking conversions work?

1 US cup is about 236.6 mL, 1 US tablespoon is about 14.79 mL, and 1 US teaspoon is about 4.93 mL. This calculator uses those exact factors so recipe scaling stays accurate.

How precise should I be when converting volumes?

For cooking, 2–3 significant figures are usually enough. For lab work, fuel ordering, or construction estimates, use the full 4 decimal places shown here to avoid compounding rounding errors.

How is this different from the geometry "Volume" calculator?

This tool converts a volume value between units (e.g. liters to gallons). The geometry Volume calculator computes the volume of a shape (cube, sphere, cylinder, cone) from its dimensions. Use both together when sizing a tank or container.

CONUnit Conversion

Volume Converter

Convert between liters, milliliters, cubic meters, US gallons, cups, fluid ounces, and Imperial gallons. Built for recipes, fuel, container sizes, and US/UK liquid measures.

Volume

From unit

To unit

Try an example

Enter values above to see results

How It Works

Formula

r = v \times \dfrac{f_{\text{from}}}{f_{\text{to}}}

Where

$v$: Input value
$r$: Converted volume
$f_{\text{from}}$: Conversion factor of the source unit (liters per unit)(L)
$f_{\text{to}}$: Conversion factor of the target unit (liters per unit)(L)

The calculator converts your value into liters as a base unit, then converts from liters into the target unit. This keeps every metric, US, and Imperial volume pair consistent.

Frequently Asked Questions

Related Calculators

Weight Converter

Convert weight and mass units with a focused metric-to-imperial tool.

Length Converter

Convert metric and imperial length units without cross-category noise.

Temperature Converter

Convert temperatures with dedicated Celsius, Fahrenheit, and Kelvin controls.

Volume Calculator

Volume of five common shapes, with liquid capacity.

How It Works

Frequently Asked Questions

Related Calculators

Ready to Calculate?