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Volume Converter

US • Imperial • Metric • 11 units

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How to Use the Volume Converter

Enter a volume — type any positive number. Negative volumes are rejected.
Select From unit — US gallon, UK gallon, cup, fluid oz, tablespoon, liter, mL, or more.
Select To unit — choose your target measurement.
Results panel — shows the converted value plus liters, mL, gallons, and cups simultaneously.
Important — US gallon (3.785 L) differs from UK gallon (4.546 L). Select carefully!

Why Use This Volume Converter

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Fuel & Gas

Convert gas tank size and fuel economy between US gallons, UK gallons, and liters.

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Cooking & Baking

Convert between cups, tablespoons, teaspoons, and milliliters for any recipe.

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Shopping & Import

Compare product sizes labeled in different units when buying from international sellers.

Volume Conversion Guide — Gallons, Liters, Cups & Fluid Ounces

Volume conversions are among the most searched in the United States because of the gap between US customary units (gallons, quarts, pints, cups, fluid ounces) and the metric system (liters, milliliters). This comes up constantly in cooking, fuel purchases, home brewing, aquarium setup, and shopping from international retailers.

Key volume facts: 1 US gallon = 3.78541 liters = 4 quarts = 8 pints = 16 cups = 128 fluid ounces. 1 US cup = 236.588 mL = 8 fluid ounces = 16 tablespoons = 48 teaspoons. 1 fluid ounce = 29.5735 mL. 1 liter = 33.814 US fluid ounces = 4.227 cups. Note: the UK pint = 568 mL, while the US pint = 473 mL — 20% larger in the UK.

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Fuel Conversions

1 US gal = 3.785 L. 10 gal = 37.85 L. 20 gal = 75.7 L. Gas tank: 12 gal = 45.4 L. 15 gal = 56.8 L. 20 gal = 75.7 L. UK gal = 4.546 L (20% larger).

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Cooking Measures

1 cup = 236.6 mL. ½ cup = 118.3 mL. ¼ cup = 59.1 mL. 1 tbsp = 14.79 mL. 1 tsp = 4.93 mL. 1 fl oz = 29.57 mL. 1 pint = 473.2 mL = 2 cups.

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Aquarium & Pool

10-gal tank = 37.85 L. 20-gal = 75.7 L. 55-gal = 208 L. Average pool = 15,000 gal = 56,775 L. Hot tub = 400 gal = 1,514 L.

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Beverage Sizes

12 fl oz can = 354.9 mL. 16 fl oz pint = 473 mL. 20 fl oz = 591 mL. 1 liter bottle = 33.8 fl oz. 2-liter = 67.6 fl oz = 8.45 cups.

Volume Conversion FAQ

How many liters in a US gallon? ▾

1 US gallon = 3.78541 liters. To convert gallons to liters: multiply by 3.785. To convert liters to gallons: divide by 3.785. Common conversions: 5 gal = 18.93 L. 10 gal = 37.85 L. 20 gal = 75.71 L. Note: 1 UK (Imperial) gallon = 4.54609 liters — about 20% larger than the US gallon.

How many cups in a liter? ▾

1 liter = 4.22675 US cups. Conversely, 1 US cup = 236.588 mL = 0.236588 liters. Common conversions: 2 liters = 8.45 cups. 3 liters = 12.68 cups. Note: a standard US measuring cup is 8 fluid ounces = 236.6 mL. The UK metric cup = 250 mL, and the old UK imperial cup = 284 mL — different from the US cup.

How many tablespoons in a cup? ▾

16 tablespoons = 1 US cup. 1 tablespoon = 3 teaspoons = 14.79 mL. 1 cup = 16 tbsp = 48 tsp = 8 fl oz = 236.6 mL. Common fractional cups: ¾ cup = 12 tbsp. ⅔ cup = 10 tbsp + 2 tsp. ½ cup = 8 tbsp. ⅓ cup = 5 tbsp + 1 tsp. ¼ cup = 4 tbsp.

What is the difference between fluid ounces and weight ounces? ▾

A fluid ounce (fl oz) is a volume measurement: 1 fl oz = 29.5735 mL. A weight ounce (oz) = 28.3495 grams. They are different things! Water is close (1 fl oz of water weighs about 1.043 oz = 29.57 g) but all other liquids differ. Oil: 1 fl oz ≈ 0.95 oz by weight. Honey: 1 fl oz ≈ 1.5 oz by weight. Always check if a recipe means volume (fl oz) or weight (oz).

How many milliliters in a teaspoon? ▾

1 US teaspoon = 4.92892 mL (≈ 5 mL for practical purposes). Medical dosing often rounds to exactly 5 mL per teaspoon. 1 tablespoon = 3 teaspoons = 14.79 mL (≈ 15 mL). Common cooking conversions: ¼ tsp = 1.23 mL. ½ tsp = 2.46 mL. 1 tsp = 4.93 mL. 1 tbsp = 14.79 mL.