Cubic Feet to Gallons Converter
Quickly convert between cubic feet and gallons (both US and Imperial). Supports all major volume units for water tanks, aquariums, pools, and industrial containers.
How many gallons are in a cubic foot?
1 cubic foot (ft³) equals exactly 7.48052 US gallons. This means if you have a box that is 1 foot wide, 1 foot long, and 1 foot tall, it can hold about 7.48 gallons of liquid. For Imperial (UK) gallons, 1 ft³ = 6.22884 Imperial gallons. The difference exists because US and Imperial gallons have different volumes: 1 US gallon = 3.78541 liters, while 1 Imperial gallon (UK) = 4.54609 liters (about 20% larger). Always check which gallon type you need.
How do I convert cubic feet to US gallons?
Multiply cubic feet by 7.48052 to get US gallons. Formula: Gallons = ft³ × 7.48052. Examples: 1 ft³ = 7.48 gal, 10 ft³ = 74.81 gal, 50 ft³ = 374.03 gal, 100 ft³ = 748.05 gal. For a standard bathtub (about 12 ft³): 12 × 7.48 = 89.8 gallons. For a 1,000-gallon tank: 1,000 ÷ 7.48 = 133.7 ft³. Reverse formula: ft³ = Gallons ÷ 7.48052. This conversion is crucial for water tanks, aquarium sizing, and pool volume calculations.
What is the difference between US and Imperial gallons?
US gallons and Imperial (UK) gallons differ significantly. 1 US gallon = 3.78541 liters (used in US and some Latin American countries). 1 Imperial gallon = 4.54609 liters (used in UK, Canada, and some Commonwealth countries). Imperial gallon is about 20% larger. Conversion: 1 US gallon = 0.832674 Imperial gallons. 1 Imperial gallon = 1.20095 US gallons. This means: a 10-gallon UK tank holds more than a 10-gallon US tank. For precise work, always specify which gallon you are using.
How do I calculate water volume in a tank from cubic feet to gallons?
To find gallons from tank dimensions: 1. Measure tank dimensions in feet (Length × Width × Height). 2. Calculate cubic feet: Volume = L × W × H. 3. Convert to gallons: Gallons = ft³ × 7.48052. Example: A tank measuring 3 ft × 2 ft × 1.5 ft = 9 ft³ = 67.32 gallons (US). For cylindrical tanks: Volume = π × r² × h (in feet), then multiply by 7.48052. For rectangular aquariums, this converter handles the ft³ to gallons step instantly.