Common US Gallon Values in Liters

Direct answer

Multiply US liquid gallons by 3.785411784 to calculate liters.

Frequently used conversions include:

• 1 US gallon = 3.785411784 liters;
• 5 US gallons = 18.92705892 liters;
• 10 US gallons = 37.85411784 liters;
• 20 US gallons = 75.70823568 liters;
• 50 US gallons = 189.2705892 liters;
• 100 US gallons = 378.5411784 liters.

Enter another quantity into the US Gallons to Liters Converter.

Common values from 1 to 10 US gallons

Common values from 12 to 50 US gallons

Common large capacities

Common fuel quantities

Fuel pumps and receipts commonly show decimal quantities, but these whole-gallon references are useful for quick comparisons:

• 5 gallons = 18.93 liters;
• 8 gallons = 30.28 liters;
• 10 gallons = 37.85 liters;
• 12 gallons = 45.42 liters;
• 15 gallons = 56.78 liters;
• 20 gallons = 75.71 liters.

Preserve every decimal digit shown by the pump or receipt when a detailed fuel record is required.

Common vehicle tank capacities

A listed capacity is normally a nominal specification. It does not show how much fuel can be added during a particular fill-up.

Common aquarium capacities

• 5 gallons = 18.93 liters;
• 10 gallons = 37.85 liters;
• 20 gallons = 75.71 liters;
• 29 gallons = 109.78 liters;
• 40 gallons = 151.42 liters;
• 55 gallons = 208.20 liters;
• 75 gallons = 283.91 liters;
• 100 gallons = 378.54 liters.

Aquarium decorations, substrate, equipment, and space below the rim can reduce the actual water volume below the marketed capacity.

Common water-storage capacities

Common partial-gallon quantities

How to calculate a value not listed

Multiply the complete US gallon quantity by 3.785411784.

Example: convert 17 US gallons

Using the exact calculation:

Rounded values versus exact values

Reference tables commonly round liter results to two decimal places. For example, 25 US gallons equals exactly 94.6352946 liters but is commonly displayed as 94.64 liters.

A rounded display is useful for general comparison. Keep additional digits when technical, commercial, purchasing, or reporting requirements depend on greater precision.

US gallon versus Imperial gallon

Confirm the gallon system before using a reference value from a product label, vehicle specification, tank listing, or international source.

Common mistakes

Using the closest listed value

A quantity such as 13.6 gallons should be converted directly rather than replaced with 13 or 14 gallons.

Treating four liters as exact

Multiplying by four is a quick estimate, not an exact conversion.

Using an Imperial conversion table

Imperial gallons are larger than US liquid gallons.

Confusing capacity with current contents

A container's maximum capacity does not show the amount of liquid currently inside it.

Related US gallons to liters guides

Frequently asked questions