How do you convert gallons to cubic feet?

To convert gallons (gal (US)) to cubic feet (ft³), multiply the volume in gallons by 0.13368 (cubic feet = gallons × 0.13368).

What is 500 gallons in cubic feet?

500 gallons (500 gal (US)) is equal to 66.84028 cubic feet (66.84028 ft³).

Which is larger, 1 gallon (us liquid) (gal (US)) or 1 cubic foot (ft³)?

One cubic foot (ft³) is larger than one gallon (us liquid) (gal (US)). Specifically, 1 ft³ equals 7.48052 gal (US), while 1 gal (US) is 0.13368 ft³.

How do I convert back from cubic feet (ft³) to gallons (us) (gal (US))?

To reverse the calculation from ft³ to gal (US), multiply your cubic foot value by the inverse factor 7.48052 (or divide by 0.13368). You can also click the Swap button in the tool above to flip directions in one click.

How many decimal places should I round gal (US) to ft³ results to?

For everyday comparisons and quick estimates, rounding to 2 decimal places is usually sufficient (for example, 500 gal (US) ≈ 66.84 ft³). For engineering, laboratory, or machining specifications, select 4 or 6 decimals—or Scientific (10ⁿ) mode—in the calculator toolbar above.

Gallons to Cubic Feet Converter

Enter the volume in gallons below to convert it to cubic feet.

Cubic Feet to Gallons (US) (ft³ → gal (US))

Convert Gallons (US) to Cubic Feet

Enter a value in gallons (us) (gal (US)) to convert to cubic feet (ft³).

Value (gal (US))

From

Result

•

66.840277778cubic feet

500 gal (US) = 66.840277778 ft³

Result updates automatically

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Equivalent Measurements Across UnitsFor 500 gal (US)

Milliliters1,892,705.892 mL

Liters1,892.70589 L

Suggested Conversions

Reference:NIST OWM (SI Units — Volume)

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Gallon to Cubic Foot Conversion Table

Table showing various gallon measurements converted to cubic feet. Click any preset value or arrow to load it into the converter.

Gallons (US) (gal (US))	Cubic Feet (ft³)
1 gal (US)	0.1336806 ft³
2 gal (US)	0.2673611 ft³
5 gal (US)	0.6684028 ft³
10 gal (US)	1.3368056 ft³
15 gal (US)	2.0052083 ft³
20 gal (US)	2.6736111 ft³
25 gal (US)	3.3420139 ft³
30 gal (US)	4.0104167 ft³
50 gal (US)	6.6840278 ft³
75 gal (US)	10.0260417 ft³

How to Convert Gallons to Cubic Feet

To convert gallons to cubic feet, multiply the volume by the following conversion ratio: 0.1336806 cubic feet/gallon.

Since one gallon is equal to 0.1336806 cubic feet, you can use this simple formula to convert:

cubic feet = gallons × 0.1336806

The volume in cubic feet is equal to the volume in gallons multiplied by 0.1336806.

For example, here's how to convert 500 gallons to cubic feet using the formula above.

cubic feet = (500 gal (US) × 0.1336806) = 66.8402778 ft³

How Many Cubic Feet Are in a Gallon?

There are 0.1336806 cubic feet in a gallon, which is why we use this value in the formula above.

1 gal (US) = 0.1336806 ft³|1 ft³ = 7.4805195 gal (US)

Our gallon to cubic foot calculator automatically converts your volume measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.

Gallons and cubic feet are both units used to measure volume. Keep reading to learn more about each unit.

What Is a Gallon?

A gallon is a unit of volume equal to 3.7854118 liters (L), the base unit for volume. US liquid gallon defined as exactly 231 cubic inches (3.78541 L). [1]

The gallon is classified as a US customary unit of volume. Gallons can be abbreviated as gal (US); for example, 1 gallon can be written as 1 gal (US).

When working with gallons (gal (US)) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.

In practice, gallons (gal (US)) are widely used across standard volume applications within US customary workflows, engineering documentation, and technical data sheets.

Learn more about gallons in our Volume & Liquid Converter.

What Is a Cubic Foot?

A cubic foot is a unit of volume equal to 28.3168466 liters (L), the base unit for volume. Equal to 1,728 cubic inches or 28.3168 liters. [2]

The cubic foot is classified as a US customary and imperial unit of volume. Cubic Feet can be abbreviated as ft³; for example, 1 cubic foot can be written as 1 ft³.

When working with cubic feet (ft³) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.

In practice, cubic feet (ft³) are widely used across standard volume applications within US customary and imperial workflows, engineering documentation, and technical data sheets.

Learn more about cubic feet in our Volume & Liquid Converter.

When converting volume between gallons (gal (US)) and cubic feet (ft³), keep full floating-point precision (1 gal (US) = 0.1336806 ft³; 1 ft³ = 7.4805195 gal (US)) during intermediate calculations and round only the final cubic foot figure to match your instrument tolerance.

More Gallon & Cubic Foot Conversions

Need to calculate in the opposite direction? Use our cubic feet to gallons (us) converter (ft³ to gal (US)) to switch your starting unit immediately. You can also explore related tools such as converting cubic meters to cubic feet, converting cubic yards to cubic feet, or converting gallons (us) to liters.

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Open Cooking & Ingredient Converter

Weight and volume require ingredient density (g/mL). Choose a USDA FoodData Central verified ingredient below:

Flour (125 g/cup)Granulated Sugar (200 g/cup)Brown Sugar (220 g/cup)Powdered Sugar (120 g/cup)Butter (227 g/cup)Rice (185 g/cup)Milk (244 g/cup)Water (236.6 g/cup)Honey (339 g/cup)Cooking Oil (218 g/cup)Salt (292 g/cup)

Frequently Asked Questions

There are 0.13368 cubic feet (ft³) in 1 gallon (gal (US)). Conversely, 1 cubic foot (ft³) is equal to 7.48052 gallons (gal (US)).

Volume & Liquid Converter

Quick Info

Direct Factor: 1 gallon (us liquid) (gal (US)) equals 0.13368 cubic feet (ft³).
Inverse Factor: 1 cubic foot (ft³) equals 7.48052 gallons (us) (gal (US)).
Formula: cubic feet = gallons (us) × 0.13368.
Verified Precision: Anchored to official NIST SP 811 and ISO/IEC 80000 standards.

Units Comparison

Gallon (US Liquid) (gal (US))

US liquid gallon defined as exactly 231 cubic inches (3.78541 L).

Cubic Foot (ft³)

Equal to 1,728 cubic inches or 28.3168 liters.

Liter (L)

Metric unit of volume equal to 1 cubic decimeter (1,000 mL).

References

[1]NIST OWM · SI Units — Volume
Source
[2]NIST HB 44 · Liquid & Dry Capacity Tables
Source
[3]NIST SP 811 · NIST SP 811 App. B.9
Source

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References

NIST · BIPM · ISO

[1]
NIST OWM (SI Units — Volume)·Volume & Liquid Metrology Standard — Gallons (US) (gal (US)) to Cubic Feet (ft³)
NIST OWM Standard
[2]
NIST HB 44 (Liquid & Dry Capacity Tables)·Unit Specifications: Gallon (US Liquid) (gal (US)) & Cubic Foot (ft³)
NIST HB 44 Specification
[3]
NIST SP 811 (NIST SP 811 App. B.9)·Conversion Factors & Mathematical Basis (gal (US) to ft³)
NIST SP 811 Reference

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