Cubic inches are a generic volume measurement in the imperial system in the United States, and are abbreviated "cu. in.," "in^3" or "CI." Fluid ounces are also a volume measurement, but is used predominately for fluids. Fluid ounces are abbreviated "fl. oz." Since both units measure volume, you can convert directly between the two. Each fluid ounce equals 1.80468 cubic inches. You can convert between the two units with multiplication or division.
Instructions
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1
Multiply the number of fluid ounces by 1.80468 to convert to cubic inches. For example, if you have 31 fluid ounces, multiply 31 by 1.80468 to get 55.95 in^3.
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2
Divide the number of fluid ounces by 0.554112 to convert to cubic inches. In this example, divide 31 by 0.554112 to confirm your answer of 55.95 in^3.
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3
Verify your answer with an online fluid ounces-to-cubic inches calculator (see Resources). Enter the number of fluid ounces and press "Go!"