Is a US gallon the same as a UK gallon?

No. A US gallon is 3.785 L while an imperial (UK) gallon is 4.546 L, roughly 20% larger. The converter lists both separately — check which system your source uses, because mixing them produces a large error in fuel, paint or bulk recipes.

How many cups are in a liter?

A US cup is 236.59 mL, so 1 liter is about 4.23 US cups. If you are working with the metric cup used in Australia and the UK (250 mL), 1 liter is exactly 4 cups. Recipes rarely state which cup they mean, so weighing ingredients in grams avoids the ambiguity entirely.

How many milliliters are in a fluid ounce?

A US fluid ounce is 29.5735 mL and an imperial fluid ounce is 28.4131 mL. The difference is about 4%, small enough to ignore for a single ounce but significant when scaling a recipe up.

Is a fluid ounce the same as an ounce of weight?

No — a fluid ounce measures volume and an ounce measures weight. They coincide only for water: 1 US fl oz of water weighs about 1.04 oz. For flour, sugar or oil the weight per fluid ounce differs, which is why volume and weight are not interchangeable in baking.

How do I convert liters to gallons?

Divide liters by 3.785411784 for US gallons, or by 4.54609 for imperial gallons. For example, 10 L is 2.64 US gallons or 2.20 UK gallons.

Volume Converter

Volume is where US and UK units quietly diverge: a US gallon is 3.785 L but an imperial gallon is 4.546 L, a 20% difference. This converter keeps both systems separate so you never mix them by accident.

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