General
Gallons to Cubic Feet Calculator
Convert both US and UK gallons to cubic feet with this easy-to-use calculator.
Reviewed by the calculator.uk.com Team · Last reviewed 8 May 2026 · Our methodology
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Related to Gallons to Cubic Feet Calculator
The Gallons to Cubic Feet Calculator performs volume conversions from both US and UK (Imperial) gallons to cubic feet. This calculator uses precise conversion factors to ensure accurate results for both gallon measurements, which is essential since US and UK gallons differ in volume.
Conversion Formulas
• 1 US gallon = 0.133681 cubic feet
• 1 UK gallon = 0.160544 cubic feet
The calculator automatically multiplies your input gallon value by these conversion factors to provide instant results in cubic feet. This is particularly useful for converting large volumes of liquid, tank capacities, or any other volume measurements between these common units.
The calculator provides conversion results in cubic feet based on whether you select US or UK (Imperial) gallons. Understanding the difference between these measurements is important as they differ in volume:
US vs UK Gallons
The UK gallon is approximately 20% larger than the US gallon, which means it will convert to a larger volume in cubic feet. When using these values, always make sure to specify which gallon measurement you're using to avoid confusion in calculations or comparisons.
For applications in the United States, use the US gallons option. For applications in the UK or other countries using Imperial measurements, use the UK gallons option. The calculator allows you to switch between both systems to ensure accurate conversions regardless of your location or requirements.
1. Why are there different values for US and UK gallons?
The US and UK gallons are different units of measurement that evolved separately. One US gallon equals approximately 3.785 liters, while one UK (Imperial) gallon equals approximately 4.546 liters. This historical difference affects their conversion to cubic feet.
2. How accurate are these conversions?
The conversions are highly accurate, using precise conversion factors to 6 decimal places. The calculator uses 0.133681 for US gallons and 0.160544 for UK gallons to cubic feet, which are the standard conversion rates used in scientific and engineering applications.
3. When would I need to convert gallons to cubic feet?
This conversion is commonly needed for calculating tank capacities, pool volumes, liquid storage requirements, fuel consumption, and various industrial applications where volume measurements need to be converted between gallons and cubic feet.
4. Can I use this calculator for any type of liquid?
Yes, this calculator can be used for any liquid since it's a pure volume conversion. The conversion between gallons and cubic feet remains the same regardless of the liquid type, as it only deals with the space occupied (volume) rather than the liquid's properties.
5. What is the scientific source for this calculator?
This is a straightforward unit conversion based on fixed definitions rather than a measured relationship: a US gallon is defined as exactly 231 cubic inches, and an Imperial gallon as exactly 277.4194 cubic inches, both of which convert to cubic feet using the standard 1 foot = 12 inches relationship. These definitions are maintained by NIST in the US and equivalent measurement authorities in the UK. Because both gallon definitions are exact, the only rounding involved is in the number of decimal places displayed.