CalcBoard / All Unit Converters / Volume

Volume Converter

Litres, gallons, cups, quarts, and spoons — with US and UK gallons kept firmly apart, because they are not the same size.

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Volume has more everyday traps than any other category. The big one: a US gallon is 3.785411784 litres and a UK (imperial) gallon is 4.54609 litres. The UK gallon is about 20% larger, which quietly ruins fuel-economy comparisons and any recipe that crossed the Atlantic. Both are listed separately below.

The cooking units here are all US customary: a US cup is 236.588 ml, a tablespoon is 14.787 ml, a teaspoon is 4.929 ml. A metric cup (250 ml) and an Australian tablespoon (20 ml) differ, so check which system your recipe is written in before scaling it.

Volume Converter

1 Gallon (US) = 3.7854118 Liter
Converted in your browser. Nothing is sent anywhere.

This page’s converter uses ordinary JavaScript numbers, so long results round like any web calculator. CalcBoard’s in-app converter uses exact decimal arithmetic and works with no connection at all.

Common volume conversions

Common volume conversions for 1, 5 and 100 units
Conversion15100
Gallon (US) → Liter3.785411818.927059378.54118
Liter → Gallon (US)0.264172051.320860326.417205
Gallon (UK) → Liter4.5460922.73045454.609
Cup (US) → Milliliter236.588241182.941223658.824
Fluid ounce (US) → Milliliter29.57353147.867652957.353
Tablespoon (US) → Teaspoon (US)315300
Quart (US) → Liter0.946352954.731764794.635295
Cubic meter → Liter10005000100000

Every volume unit CalcBoard converts

All 12 units in this category, with the exact factor each one uses to reach the base unit (liter). These are the same constants the app computes with.

Every volume unit with its conversion factor and tier
UnitIn litersTier
Liter1Premium
Milliliter0.001Premium
Gallon (US)3.785411784Premium
Gallon (UK)4.54609Premium
Quart (US)0.946352946Premium
Pint (US)0.473176473Premium
Cup (US)0.2365882365Premium
Fluid ounce (US)0.0295735295625Premium
Tablespoon (US)0.0147867647812Premium
Teaspoon (US)0.00492892159375Premium
Cubic meter1000Premium
Cubic centimeter0.001Premium

Convert without a browser

This page needs a connection. The CalcBoard app does the same conversions offline, with exact decimal arithmetic, and puts the converter next to a working calculator — so you can convert a measurement in one panel and immediately use it in a formula in the next, without copying anything by hand.

Free vs. Premium, honestly: the free app includes 2 panels, basic mode, 3 converter categories, and your last 10 history entries — no ads, no time limits. A one-time $2.99 purchase (no subscription) unlocks scientific and programmer modes, up to 8 panels, the shared value tray, all 10 converter categories, full history with search and CSV export, and all themes and button styles.

Frequently Asked Questions

How many litres are in a gallon?
A US gallon is exactly 3.785411784 litres. A UK imperial gallon is exactly 4.54609 litres — about 20% bigger. Always check which gallon a figure refers to before converting.
How many ml is a cup?
A US cup is 236.5882365 ml, usually rounded to 237 ml or loosely to 240. A metric cup is 250 ml. This converter uses the US cup, matching the app.
How many tablespoons are in a cup?
16 US tablespoons make a US cup, and 3 teaspoons make a tablespoon — so 48 teaspoons per cup. Those ratios are exact within the US customary system.

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