pakmath.com

Cubic Feet to US Gallons (ft³ to gal) Converter

1 cubic foot (ft³) = 7.48052 US gallons (gal). To convert cubic feet to US gallons, multiply by 7.48052: 25 ft³ × 7.48052 = 187.013 gal.

1 ft³ = 7.4805194805 gal
Convert the other way: US Gallons to Cubic Feet

Quick facts

How to convert cubic feet to US gallons

  1. Take the value in cubic feet.
  2. Multiply it by 7.48052 (the number of US gallons in one cubic foot).
  3. Round the result to the precision you need.
gal = ft³ × 7.48052

Worked example: 25 ft³ × 7.48052 = 187.013 gal.

To convert US gallons back to cubic feet, multiply by 0.133681, or divide by 7.48052.

Source: NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units).

Cubic Feet to US Gallons conversion table

Cubic Feet to US Gallons conversion table
Cubic Feet [ft³]US Gallons [gal]
0.01 ft³0.0748051948 gal
0.1 ft³0.7480519481 gal
1 ft³7.4805194805 gal
2 ft³14.961038961 gal
3 ft³22.4415584416 gal
5 ft³37.4025974026 gal
10 ft³74.8051948052 gal
20 ft³149.6103896104 gal
50 ft³374.025974026 gal
100 ft³748.0519480519 gal
1000 ft³7480.5194805195 gal

ft³ to gal chart from 1 to 100

US Gallons to Cubic Feet conversion table

US Gallons to Cubic Feet conversion table
US Gallons [gal]Cubic Feet [ft³]
0.01 gal0.0013368056 ft³
0.1 gal0.0133680556 ft³
1 gal0.1336805556 ft³
2 gal0.2673611111 ft³
3 gal0.4010416667 ft³
5 gal0.6684027778 ft³
10 gal1.3368055556 ft³
20 gal2.6736111111 ft³
50 gal6.6840277778 ft³
100 gal13.3680555556 ft³
1000 gal133.6805555556 ft³

Cubic Feet vs US Gallons

Cubic FootUS Gallon
Symbolft³gal
Equals1 ft³ = 7.48052 gal1 gal = 0.133681 ft³

What is a cubic foot?

The volume of a cube with 1-foot sides. Used in the US for natural gas usage and shipping volume.

What is a US gallon?

A US customary unit equal to 4 quarts. Used in the US for fuel, milk, and paint.

Frequently asked questions

How many US gallons are in a cubic foot?

There are 7.48052 US gallons in 1 cubic foot (1 ft³ = 7.4805194805 gal).

How many cubic feet are in a US gallon?

There are 0.133681 cubic feet in 1 US gallon (1 gal = 0.1336805556 ft³).

How do I convert cubic feet to US gallons?

Multiply the number of cubic feet by 7.48052. For example, 10 ft³ × 7.48052 = 74.8052 gal. To convert back, multiply by 0.133681.

What is 10 ft³ in US gallons?

10 ft³ = 74.8052 gal.

What is 100 ft³ in US gallons?

100 ft³ = 748.052 gal.

Is the conversion exact?

Yes. The factor comes from the official definitions of both units (NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units)). Results are shown to up to 10 decimal places; round them to suit your purpose.

Popular volume conversions

Convert cubic feet to other units

Convert other units to US gallons

Open the full volume converter with every unit →

Related converters

Reviewed by

Dr. Muhammad Amjad Khadim PhD Mathematics

Dr. Muhammad Amjad Khadim holds a PhD in Mathematics. He writes and reviews the guides on pakmath.com and checks every formula, conversion factor and worked example against published standards and official guidance before it goes live. Spotted an error? Tell us and it will be corrected.

Google Scholar profile (opens in a new tab)

First published 28 October 2026 · Last reviewed 5 November 2026