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Cubic foot to Gallon Converter

Enter the value that you want to convert cubic foot (ft³) to gallon (gal) or gallon to cubic foot.Also written as FT³ to GAL conversion.

1 cubic foot = 6.2288355 gallon

Formula: gallon = cubic foot value × 6.2288355

FT³ to GAL — cubic foot to gallon

ft³
62.28835gal

10 cubic foot = 62.28835 gallon

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Why Convert Cubic foot to Gallon?

What is Cubic foot?

Cubic foot (ft³) is a unit of volume measurement. 1 cubic foot is equal to 6.2288355 gallon.

The Gallon Explained

Gallon (gal) is a unit of volume measurement. 1 gallon is equal to 0.1605437 cubic foot.

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.

cubic foot to gallon metric conversion table

0.01 ft³=0.06229 gal
0.1 ft³=0.62288 gal
1 ft³=6.22884 gal
2 ft³=12.45767 gal
3 ft³=18.68651 gal
4 ft³=24.91534 gal
5 ft³=31.14418 gal
6 ft³=37.37301 gal
7 ft³=43.60185 gal
8 ft³=49.83068 gal
9 ft³=56.05952 gal
10 ft³=62.28835 gal
11 ft³=68.51719 gal
12 ft³=74.74603 gal
13 ft³=80.97486 gal
14 ft³=87.20370 gal
15 ft³=93.43253 gal
16 ft³=99.66137 gal
17 ft³=105.89020 gal
18 ft³=112.11904 gal
19 ft³=118.34787 gal
20 ft³=124.57671 gal
30 ft³=186.86506 gal
40 ft³=249.15342 gal
50 ft³=311.44177 gal
60 ft³=373.73013 gal
70 ft³=436.01848 gal
80 ft³=498.30684 gal
90 ft³=560.59519 gal
100 ft³=622.88355 gal
200 ft³=1245.76709 gal
300 ft³=1868.65064 gal
400 ft³=2491.53418 gal
500 ft³=3114.41773 gal
600 ft³=3737.30128 gal
700 ft³=4360.18482 gal
800 ft³=4983.06837 gal
900 ft³=5605.95191 gal
1000 ft³=6228.83546 gal

How to Convert FT³ to GAL (Cubic foot to Gallon)?

We can convert cubic foot to gallon by using an example.

Example:

Convert 20 Cubic foot to Gallon?

We know 1 Cubic foot = 6.2288355 gallon; 1 Gallon = 0.1605437 cubic foot.

20 cubic foot = ___gal

20 × 6.2288355 = 124.57671 gal (we know 1 cubic foot = 6.2288355 gallon)

Answer:

20 cubic foot = 124.57671 gallon

Converting Cubic Feet to Gallons for Real-World Applications

Cubic feet and gallons are both used to measure volume in the US, but in different contexts. Cubic feet dominate construction and HVAC work, while gallons are used for liquids. One cubic foot contains approximately 7.48052 US gallons. This conversion is essential when sizing water heaters, calculating pool volumes, or estimating water damage.

  1. Identify the volume in cubic feet.
  2. Multiply by 7.48052 to convert to US gallons.
  3. Round to the appropriate precision for your application.
  4. Example: 10 ft³ × 7.48052 = 74.8 gallons.
💡 Tip: Quick estimate: 1 cubic foot ≈ 7.5 gallons. For most practical purposes (pools, tanks, water damage), rounding to 7.5 introduces less than 0.3% error.

Cubic Feet to Gallons — Common Conversions

Reference values for construction, plumbing, and tank sizing:

Cubic footGallon
1 ft³7.481 gal
2 ft³14.961 gal
5 ft³37.403 gal
10 ft³74.805 gal
25 ft³187.013 gal
50 ft³374.026 gal
100 ft³748.052 gal
1,000 ft³7,480.52 gal

Solved Examples: Cubic Feet to Gallons

Question 1: A rectangular water tank measures 4 ft × 3 ft × 2 ft. How many gallons does it hold?

Solution:

Volume in cubic feet = 4 × 3 × 2 = 24 ft³

Gallons = 24 × 7.48052

= 179.53 gallons

Answer: The tank holds approximately 179.5 gallons.

Question 2: Your water utility billed you for 5 CCF (hundred cubic feet) this month. How many gallons did you use?

Solution:

5 CCF = 500 cubic feet

Gallons = 500 × 7.48052

= 3,740.26 gallons

Answer: You used approximately 3,740 gallons of water.

Question 3: A flooded basement has 1.5 feet of standing water over a 200 sq ft area. How many gallons need to be pumped?

Solution:

Volume = 200 ft² × 1.5 ft = 300 ft³

Gallons = 300 × 7.48052

= 2,244.16 gallons

Answer: Approximately 2,244 gallons of water must be pumped out.

Practice Problems

Try solving these on your own to test your understanding:

  1. Convert 8 cubic feet to gallons. (Answer: 59.84 gallons)
  2. A cistern is 6 ft × 4 ft × 5 ft. How many gallons? (Answer: 898.86 gal)
  3. How many cubic feet is 500 gallons? (Answer: 66.84 ft³)
  4. Your water bill shows 3 CCF. How many gallons? (Answer: 2,244.16 gal)
  5. A hot tub is 40 ft³. How many gallons to fill it? (Answer: 299.22 gal)

Water Utility Billing: CCF Explained

Most US water utilities bill in CCF (centum cubic feet = 100 cubic feet). One CCF equals 748.052 gallons. Your water meter measures in cubic feet, and the utility converts this to billing units. Understanding the cubic-feet-to-gallon relationship helps you audit your water bill and track conservation efforts. Average US household: 5-8 CCF per month (3,740-5,984 gallons).

Swimming Pool Volume Calculations

Pool installers calculate volume in cubic feet then convert to gallons for chemical treatment. A typical rectangular pool (16 ft × 32 ft × 5 ft average depth) = 2,560 ft³ = 19,150 gallons. Above-ground round pools use πr²h for cubic feet, then multiply by 7.48. Knowing your pool's gallon capacity is critical for proper chlorine, pH, and algaecide dosing.

Key Takeaways

  • 1 cubic foot = 7.48052 US gallons.
  • Quick estimate: multiply cubic feet by 7.5.
  • 1 CCF (100 ft³) = 748 gallons — the standard water billing unit.
  • For rectangular spaces: L × W × H (in feet) × 7.48 = gallons.
  • Swimming pool volumes are calculated in ft³ then converted to gallons for chemical dosing.

Cubic foot to Gallon Conversion Formula

gallon = cubic foot × 6.2288355

1 cubic foot = 6.2288355 gallon

1 gallon = 0.1605437 cubic foot

Reverse: cubic foot = gallon × 0.1605437

Frequently Asked Questions

How many gallon are in 1 cubic foot?

There are 6.2288355 gallon in 1 cubic foot. To convert cubic foot to gallon, multiply the value by 6.2288355.

How do I convert cubic foot to gallon?

Multiply your cubic foot value by 6.2288355 to get the equivalent in gallon. For example, 5 cubic foot = 5 × 6.2288355 = 31.14418 gallon.

How do I convert gallon to cubic foot?

Multiply your gallon value by 0.1605437 to get the equivalent in cubic foot. Alternatively, divide by 6.2288355.

What is 10 cubic foot in gallon?

10 cubic foot is equal to 62.28835 gallon.

What is 100 cubic foot in gallon?

100 cubic foot is equal to 622.88355 gallon.