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Gallons to Cubic Feet Calculator

Convert between gallons and cubic feet for tanks, ponds, and water storage projects.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-25 · v1.0.0

Market
Imperial · sales tax

Converted volume

13.37 ft³

High confidence

At the values currently entered, the converted volume works out to 13.4 ft³. Note that volume sits at the low end of the range this calculator was checked against, so treat the output as indicative rather than settled. Figures are shown for United States, where IRC 2024 is the governing residential reference; switch the market above if you are building elsewhere.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • 1 cubic foot = 7.48 US gallons

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Where does this come up in home projects?
Common cases: sizing a rain barrel or cistern (often rated in gallons) against a calculated volume (in cubic feet), or checking a pond liner's water capacity.
Does this work for any liquid, not just water?
Yes — this is a pure volume unit conversion and doesn't depend on what liquid is being measured.
Is a US gallon the same as an imperial gallon?
No — a US gallon (used here) is about 3.785 liters, while an imperial (UK) gallon is larger at about 4.546 liters. Double check which one a product spec means if it's not explicit.