General
Cubic Feet to Gallons Calculator
Convert cubic feet to both US and UK gallons with this easy-to-use calculator.
Reviewed by the calculator.uk.com Team · Last reviewed 12 May 2026 · Our methodology
Enter a value to see conversion results
Related to Cubic Feet to Gallons Calculator
The Cubic Feet to Gallons Calculator performs volume conversions between cubic feet and both US and UK (Imperial) gallons. 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 cubic foot = 7.48052 US Gallons
• 1 cubic foot = 6.22884 UK Gallons
The calculator automatically multiplies your input cubic feet value by these conversion factors to provide instant results in both US and UK gallons. 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 both US gallons and UK (Imperial) gallons because these are the two most commonly used gallon measurements worldwide. Understanding both values is important as they differ in volume:
US vs UK Gallons
The US gallon is approximately 20% larger than the UK gallon, which explains the difference in conversion results. When using these values, always make sure to specify which gallon measurement you're referring to avoid confusion in calculations or comparisons.
For applications in the United States, focus on the US gallons result. For applications in the UK or other countries using Imperial measurements, use the UK gallons result. The calculator provides both to ensure universal applicability and avoid conversion errors.
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 is why we provide both conversions.
2. How accurate are these conversions?
The conversions are highly accurate, using precise conversion factors to 5 decimal places. The calculator uses 7.48052 for US gallons and 6.22884 for UK gallons per cubic foot, which are the standard conversion rates used in scientific and engineering applications.
3. When would I need to convert cubic feet to gallons?
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 cubic feet and gallons.
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 cubic feet and gallons 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?
The US gallon is defined as exactly 231 cubic inches and the imperial gallon as exactly 4.54609 litres, two historically separate definitions, which is why the same cubic-foot volume converts to a different number of gallons depending on which system is used, about 7.48 US gallons versus 6.23 imperial gallons. Both definitions are maintained today by NIST for US customary units and by UK legislation for imperial units, and because they are fixed constants, the resulting conversion factors are exact.