Cubic Feet to Gallons Converter

Cubic Feet (ft³)

Gallon Type

Enter cubic feet to convert

Quick Conversions

Conversion Formula

Cubic Feet to US Gallons:

de>Gallons = Cubic Feet × 7.48052

Cubic Feet to UK Gallons:

de>Gallons = Cubic Feet × 6.22884

How to Convert Cubic Feet to Gallons

Determine the volume in cubic feet you want to convert
Choose between US gallons or UK (Imperial) gallons
Multiply the cubic feet value by 7.48052 for US gallons
Or multiply by 6.22884 for UK gallons
The result is your volume in gallons

1 ft³ = 7.48052 US Gallons = 6.22884 UK Gallons

Common Cubic Feet to Gallons Conversions

Cubic Feet (ft³)	US Gallons	UK Gallons
1 ft³	7.48 gal	6.23 gal
2 ft³	14.96 gal	12.46 gal
5 ft³	37.40 gal	31.14 gal
10 ft³	74.81 gal	62.29 gal
15 ft³	112.21 gal	93.43 gal
20 ft³	149.61 gal	124.58 gal
25 ft³	187.01 gal	155.72 gal
50 ft³	374.03 gal	311.44 gal
100 ft³	748.05 gal	622.88 gal
500 ft³	3,740.26 gal	3,114.42 gal

Visual Comparison

1 ft³

7.48 US gal

2 ft³

14.96 US gal

5 ft³

37.40 US gal

10 ft³

74.81 US gal

Real-World Applications

Swimming Pools

A typical residential pool holds 15,000-30,000 gallons (2,005-4,010 ft³). Converting cubic feet to gallons helps calculate chemical treatments and heating costs accurately.

Water Tanks

Home water storage tanks are often measured in cubic feet but capacity specifications use gallons. A 10 ft³ tank holds approximately 75 US gallons of water.

Aquariums

Large aquariums measure tank dimensions in feet. A 4ft × 2ft × 2ft tank equals 16 ft³ or about 120 US gallons, crucial for selecting filtration systems.

HVAC Systems

Heating and cooling calculations require converting room volumes from cubic feet to determine appropriate humidifier or dehumidifier capacities measured in gallons per day.

Fuel Storage

Commercial fuel tanks have dimensions in feet but capacity in gallons. A 5ft × 4ft × 3ft tank equals 60 ft³ or approximately 449 US gallons of fuel storage.

Agriculture

Irrigation systems and water reservoirs use both measurements. Farmers convert cubic feet measurements to gallons for precise water distribution planning across fields.

Cubic Feet vs Gallons

Aspect	Cubic Feet (ft³)	Gallons (US)
Measurement System	Imperial & US Customary	US Customary
Definition	Volume of 1ft × 1ft × 1ft cube	231 cubic inches
Common Uses	Room volume, cargo space	Liquid capacity, fuel
Metric Equivalent	0.0283168 m³	3.78541 liters
Relationship	1 ft³	7.48052 gallons

US Gallons vs UK Gallons

US Gallon: Defined as exactly 231 cubic inches or 3.785411784 liters. Widely used in the United States for measuring liquids, fuel economy, and container volumes.

UK (Imperial) Gallon: Defined as 4.54609 liters, approximately 20% larger than the US gallon. Used in the United Kingdom, Canada, and some Caribbean countries.

Key Difference: 1 US gallon = 0.832674 UK gallons, which means conversions between cubic feet will vary depending on which gallon type you need.

Conversion Examples

Example 1: Small Container

Problem: Convert 3 cubic feet to US gallons

Solution: 3 ft³ × 7.48052 = 22.44 US gallons

Example 2: Water Tank

Problem: A tank measures 4ft × 3ft × 2ft. What’s its capacity in US gallons?

Solution: Volume = 24 ft³ × 7.48052 = 179.53 US gallons

Example 3: UK Gallon Conversion

Problem: Convert 10 cubic feet to UK gallons

Solution: 10 ft³ × 6.22884 = 62.29 UK gallons

Frequently Asked Questions

How many gallons are in a cubic foot? +

One cubic foot equals exactly 7.48052 US gallons or 6.22884 UK (Imperial) gallons. This conversion factor is derived from the precise definitions of each unit in their respective measurement systems.

Why are US and UK gallons different? +

The difference originates from historical definitions. The US gallon is based on the wine gallon (231 cubic inches), while the UK gallon was standardized as the imperial gallon (4.54609 liters) in 1824. The UK gallon is approximately 20% larger than the US gallon.

How do I calculate the volume of a tank in gallons? +

First, calculate the volume in cubic feet by multiplying length × width × height (all in feet). Then multiply the result by 7.48052 to get US gallons, or by 6.22884 for UK gallons. For example, a 5ft × 4ft × 3ft tank = 60 ft³ = 448.83 US gallons.

What is the reverse conversion from gallons to cubic feet? +

To convert gallons to cubic feet, divide by the conversion factor. For US gallons: divide by 7.48052 (or multiply by 0.133681). For UK gallons: divide by 6.22884 (or multiply by 0.160544). Example: 100 US gallons ÷ 7.48052 = 13.37 ft³.

Is cubic feet a metric or imperial unit? +

Cubic feet is an imperial and US customary unit, not a metric unit. The metric equivalent for volume is the cubic meter (m³) or liter (L). One cubic foot equals approximately 0.0283168 cubic meters or 28.3168 liters.

Which countries use gallons instead of liters? +

The United States primarily uses US gallons for fuel and liquids. The United Kingdom, Canada, and some Caribbean nations historically use UK (Imperial) gallons, though many have transitioned to liters. The US remains the primary country still widely using gallons in daily commerce.

How accurate is the 7.48 conversion factor? +

The precise conversion factor is 7.48051948051948… (repeating). Using 7.48052 provides accuracy to five decimal places, which is sufficient for virtually all practical applications. For extreme precision in scientific work, use the full value or 7.480519480519481.

Can I use this conversion for gas volumes? +

Yes, cubic feet to gallons conversion works for any volume measurement, whether liquid or gas. However, for gases, cubic feet is more commonly used as the standard unit. Natural gas, for instance, is typically measured in cubic feet (or CCF – hundred cubic feet) rather than gallons.

Additional Volume Conversions

From	To	Multiply By
Cubic Feet	Cubic Inches	1,728
Cubic Feet	Cubic Yards	0.037037
Cubic Feet	Liters	28.3168
Cubic Feet	Cubic Meters	0.0283168
US Gallons	Liters	3.78541
US Gallons	Quarts	4
US Gallons	Pints	8
UK Gallons	Liters	4.54609