# Cubic Feet to Gallons Converter URL: https://speedycalculator.com/calculators/conversion/cubic-feet-to-gallons/ Last updated: 2026-10-25 > Convert cubic feet (ft³) to US gallons (US gal): 1 cubic foot = 7.4805195 US gal, so multiply by 7.4805195 or divide by 0.13368056. Both fields are editable, so you can also type in US gallons and get cubic feet back. ## Inputs - Cubic feet (ft³) ## Results - US gallons ## Formula ``` 1 ft³ = 7.4805195 US gal 1 US gal = 0.13368056 ft³ US gal = ft³ × 7.4805195 ``` ## Explanation A cubic foot holds about 7.48 U.S. gallons. Pool, tank and pond volumes measured in feet convert to gallons for buying water treatment chemicals. ### How to use the Cubic Feet to Gallons Converter - Type the number of cubic feet into the **Cubic feet** field. Decimals such as 0.5 are fine. - Read the answer in **US gallons** – it updates as you type, with no button to press. - To convert the other way, type into **US gallons** and the cubic feet are recalculated. - Press **Copy results** to copy both values with the page title, or **Copy link** to share this exact conversion. This page converts only ft³ ⇄ US gal. Need a different unit? Use the general volume converter, where you can choose any “from” and “to” unit. ### How it works Both units measure volume, so they are always in the same ratio: one cubic foot equals 7.4805195 US gallons. The calculator multiplies the number of cubic feet you type by 7.4805195 to give US gallons, and when you type into the US gallons field it divides by the same factor to give cubic feet. Because the ratio never changes, doubling the cubic feet always doubles the US gallons. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation). ### How to convert cubic feet to US gallons - Write down the value in cubic feet, for example **1 ft³**. - Multiply by the conversion factor 7.4805195 (because 1 cubic foot = 7.4805195 US gal). - 1 × 7.4805195 = **7.4805195 US gal**. - To go back from US gallons to cubic feet, divide by 7.4805195 – or multiply by 0.13368056. ### ft³ to US gal conversion table Cubic feetUS gallonsUS gallonsCubic feet0.5 ft³3.7402597 US gal1 US gal0.13368056 ft³1 ft³7.4805195 US gal2 US gal0.26736111 ft³2 ft³14.961039 US gal5 US gal0.66840278 ft³5 ft³37.402597 US gal10 US gal1.3368056 ft³10 ft³74.805195 US gal20 US gal2.6736111 ft³50 ft³374.02597 US gal50 US gal6.6840278 ft³100 ft³748.05195 US gal100 US gal13.368056 ft³1,000 ft³7,480.5195 US gal1,000 US gal133.68056 ft³ ### What is a cubic foot? A cubic foot is a cube 1 ft on each side, about 28.32 litres or 7.48 U.S. gallons. Refrigerators, moving trucks, gas meters and lumber are measured in cubic feet in the U.S. ### What is a US gallon? The U.S. liquid gallon is exactly 231 cubic inches, about 3.785 litres. It is used for fuel, milk, water and paint in the United States. ### Quick mental conversion For a fast estimate, multiply cubic feet by about **7.5** to get US gallons; the error is about 0.3%. Use the calculator above when you need the exact figure. ### Common mistakes to avoid Mixing u.s. and uk gallons, pints and fluid ounces, assuming a cup is always 250 ml, and treating volume and weight as interchangeable for anything except water. ## Worked example Inputs — Cubic feet: 1 ft³. Results — **US gallons = 7.48051948 US gal**. ## FAQ **How many gallons in a cubic foot?** About 7.4805 US gal. **How many gallons in a 10 × 20 × 5 ft pool?** 1,000 ft³ ≈ 7,481 gal. **How many US gallons are in one cubic foot?** 1 ft³ = 7.4805195 US gal. **How many cubic feet are in one US gallon?** 1 US gal = 0.13368056 ft³. **How do I convert cubic feet to US gallons?** Multiply the number of cubic feet by 7.4805195. For example, 1 ft³ × 7.4805195 = 7.4805195 US gal. **How do I convert US gallons back to cubic feet?** Divide by 7.4805195 (or multiply by 0.13368056), or simply type the value into the US gallons field above. **What is 10 ft³ in US gallons?** 10 ft³ = 74.805195 US gal. **What is 100 ft³ in US gallons?** 100 ft³ = 748.05195 US gal. **Is this conversion exact?** Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit. **Can I convert to other units on this page?** This page converts only between cubic feet and US gallons. To pick any volume unit, use the general volume converter linked under Related calculators. **What formula does the Cubic Feet to Gallons Converter use?** 1 ft³ = 7.4805195 US gal. ## Sources - [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811) - [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)