Gallon to Cubic foot Converter
Enter the value that you want to convert gallon (gal) to cubic foot (ft³) or cubic foot to gallon.Also written as GAL to FT³ conversion.
1 gallon = 0.1605437 cubic foot
Formula: cubic foot = gallon value × 0.1605437
GAL to FT³ — gallon to cubic foot
10 gallon = 1.60544 cubic foot
Popular Volume Converters:
Gallon vs Cubic foot
The Gallon Explained
Gallon (gal) is a unit of volume measurement. 1 gallon is equal to 0.1605437 cubic foot.
What is Cubic foot?
Cubic foot (ft³) is a unit of volume measurement. 1 cubic foot is equal to 6.2288355 gallon.
Volume Measurement Systems
Volume units are particularly confusing because the US and UK gallons differ (US gallon = 3.785 L, UK gallon = 4.546 L), as do their pints, cups, and fluid ounces. Cooking, fuel economy, beverage production, and pharmaceutical compounding all require precise volume conversions. Laboratory work uses milliliters and liters while US recipes specify cups, tablespoons, and fluid ounces.
gallon to cubic foot metric conversion table
| 0.01 gal | = | 0.00161 ft³ |
| 0.1 gal | = | 0.01605 ft³ |
| 1 gal | = | 0.16054 ft³ |
| 2 gal | = | 0.32109 ft³ |
| 3 gal | = | 0.48163 ft³ |
| 4 gal | = | 0.64217 ft³ |
| 5 gal | = | 0.80272 ft³ |
| 6 gal | = | 0.96326 ft³ |
| 7 gal | = | 1.12381 ft³ |
| 8 gal | = | 1.28435 ft³ |
| 9 gal | = | 1.44489 ft³ |
| 10 gal | = | 1.60544 ft³ |
| 11 gal | = | 1.76598 ft³ |
| 12 gal | = | 1.92652 ft³ |
| 13 gal | = | 2.08707 ft³ |
| 14 gal | = | 2.24761 ft³ |
| 15 gal | = | 2.40815 ft³ |
| 16 gal | = | 2.56870 ft³ |
| 17 gal | = | 2.72924 ft³ |
| 18 gal | = | 2.88979 ft³ |
| 19 gal | = | 3.05033 ft³ |
| 20 gal | = | 3.21087 ft³ |
| 30 gal | = | 4.81631 ft³ |
| 40 gal | = | 6.42175 ft³ |
| 50 gal | = | 8.02718 ft³ |
| 60 gal | = | 9.63262 ft³ |
| 70 gal | = | 11.23806 ft³ |
| 80 gal | = | 12.84349 ft³ |
| 90 gal | = | 14.44893 ft³ |
| 100 gal | = | 16.05437 ft³ |
| 200 gal | = | 32.10873 ft³ |
| 300 gal | = | 48.16310 ft³ |
| 400 gal | = | 64.21746 ft³ |
| 500 gal | = | 80.27183 ft³ |
| 600 gal | = | 96.32619 ft³ |
| 700 gal | = | 112.38056 ft³ |
| 800 gal | = | 128.43492 ft³ |
| 900 gal | = | 144.48929 ft³ |
| 1000 gal | = | 160.54365 ft³ |
How to Convert GAL to FT³ (Gallon to Cubic foot)?
We can convert gallon to cubic foot by using an example.
Example:
Convert 20 Gallon to Cubic foot?
We know 1 Gallon = 0.1605437 cubic foot; 1 Cubic foot = 6.2288355 gallon.
20 gallon = ___ft³
20 × 0.1605437 = 3.21087 ft³ (we know 1 gallon = 0.1605437 cubic foot)
Answer:
20 gallon = 3.21087 cubic foot
How to Convert Gallons to Cubic Feet
When you need to express liquid volumes in spatial terms — such as figuring out how much space a quantity of water occupies in a tank or pipe — you convert gallons to cubic feet. One US gallon occupies 0.133681 cubic feet of space. This conversion bridges the gap between liquid measurement and spatial/dimensional measurement.
- Start with the volume in US gallons.
- Multiply by 0.133681 to get cubic feet.
- Alternatively, divide gallons by 7.48052.
- Example: 100 gallons × 0.133681 = 13.37 ft³.
Gallons to Cubic Feet Quick Chart
Converting common gallon quantities to cubic feet for tank and pipe sizing:
| Gallon | Cubic foot |
|---|---|
| 1 gallon | 0.134 ft³ |
| 5 gallons | 0.668 ft³ |
| 40 gallons | 5.347 ft³ |
| 55 gallons | 7.353 ft³ |
| 100 gallons | 13.368 ft³ |
| 300 gallons | 40.104 ft³ |
| 1,000 gallons | 133.681 ft³ |
| 10,000 gallons | 1,336.81 ft³ |
Solved Examples: Gallons → Cubic Feet
Question 1: A water heater holds 50 gallons. What is its internal volume in cubic feet?
Solution:
Cubic feet = gallons × 0.133681
= 50 × 0.133681
= 6.684 ft³
Answer: A 50-gallon water heater has an internal volume of about 6.68 cubic feet.
Question 2: You need to store 2,000 gallons of rainwater. What tank volume in cubic feet is required?
Solution:
Cubic feet = 2,000 × 0.133681
= 267.36 ft³
Answer: You need a tank with at least 267.4 cubic feet of internal volume.
Question 3: A pipe can hold 12 gallons per linear foot. Express this capacity in cubic feet per foot.
Solution:
Cubic feet per foot = 12 × 0.133681
= 1.604 ft³ per foot of pipe
Answer: The pipe holds 1.604 cubic feet of water per linear foot.
Practice Questions
Try solving these on your own to test your understanding:
- Convert 75 gallons to cubic feet. (Answer: 10.03 ft³)
- A 330-gallon tote — how many cubic feet? (Answer: 44.11 ft³)
- How many gallons fit in 20 cubic feet? (Answer: 149.61 gallons)
- A fuel tank is 8 ft³. How many gallons? (Answer: 59.84 gallons)
- Convert 5,000 gallons to cubic feet. (Answer: 668.4 ft³)
Pipe and Tank Sizing
Engineers size water storage tanks in cubic feet because dimensions (length × width × height) naturally produce cubic feet. Converting the required gallon capacity to cubic feet first lets you determine physical dimensions. For a cylindrical tank: Volume (ft³) = π × r² × h. Then verify gallons = ft³ × 7.48 meets your needs. Always add 10-15% overhead for expansion and incomplete filling.
Propane and Fuel Tanks
Residential propane tanks are sold by gallon capacity (120, 250, 500, 1000 gallon) but must fit in specific physical spaces. Converting to cubic feet helps during site planning: a 500-gallon propane tank occupies about 66.84 ft³ internally. The external dimensions are larger due to tank wall thickness, supports, and safety clearances required by code.
Key Takeaways
- 1 US gallon = 0.133681 cubic feet.
- Divide gallons by 7.48 (or multiply by 0.1337) to get cubic feet.
- A 55-gallon drum takes up about 7.35 cubic feet.
- Use this conversion for tank sizing: gallons needed ÷ 7.48 = required ft³.
- Always add 10-15% to calculated tank volumes for safety margin.
Gallon to Cubic foot Conversion Formula
cubic foot = gallon × 0.1605437
1 gallon = 0.1605437 cubic foot
1 cubic foot = 6.2288355 gallon
Reverse: gallon = cubic foot × 6.2288355
Frequently Asked Questions
How many cubic foot are in 1 gallon?
There are 0.1605437 cubic foot in 1 gallon. To convert gallon to cubic foot, multiply the value by 0.1605437.
How do I convert gallon to cubic foot?
Multiply your gallon value by 0.1605437 to get the equivalent in cubic foot. For example, 5 gallon = 5 × 0.1605437 = 0.80272 cubic foot.
How do I convert cubic foot to gallon?
Multiply your cubic foot value by 6.2288355 to get the equivalent in gallon. Alternatively, divide by 0.1605437.
What is 10 gallon in cubic foot?
10 gallon is equal to 1.60544 cubic foot.
What is 100 gallon in cubic foot?
100 gallon is equal to 16.05437 cubic foot.