Why Use This Tool?
Volume units are where metric and US customary measurements truly diverge — US gallons, quarts, pints, cups and fluid ounces against liters and milliliters. This converter shows your value in all of them simultaneously, which is exactly what recipe scaling and fuel calculations need.
All US customary units here are the US versions (the imperial gallon is about 20% larger — a genuine international trap), and cubic meters and feet are included for engine and pool sizes.
How It Works
- Enter the volume value.
- Pick the source and target units.
- Read the full conversion table with your target highlighted.
Frequently Asked Questions
How many liters in a gallon?
One US gallon is exactly 3.785411784 liters. Enter 1 gallon as the source and read the liter row — the swap button converts liters to gallons instantly.
How many ml in an ounce?
One US fluid ounce is 29.5735295625 milliliters — the number every recipe conversion between US and metric measurements needs.
Are US and imperial gallons the same?
No — the imperial (UK) gallon is 4.546 liters versus the US gallon's 3.785, a 20% difference. This converter uses US units throughout.
Tips & Things to Watch
- Cups in recipes are US cups (236.6 ml) — metric cups are 250 ml.
- Fuel consumption: mpg ↔ L/100km conversion pairs with the Speed converter.
- Pool and aquarium volumes in cubic feet convert to gallons here too.