Convert Fluid Ounce to Cubic Inch (fl oz → in³)

Converting fluid ounces to cubic inches is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in fluid ounces

   Start with the number of fluid ounces (fl oz) you want to convert.
2. 2
   Multiply by 1.804688

   The conversion factor from fl oz to in³ is 1.804688. Multiply your value by this number.
3. 3
   Read the result in cubic inches

   The result is your value in cubic inches (in³).

Multiply the value in fluid ounces by 1.804688. For the reverse direction, multiply by 0.554113.

• ✓1 US fl oz ≈ 29.6 ml; 1 UK fl oz ≈ 28.4 ml.
• ✓8 US fl oz ≈ 1 US cup ≈ 237 ml.
• ✓Use ml to avoid ambiguity between US and UK fluid ounces.

• ✗Mixing US and UK fluid ounces — 16 fl oz (US) = 473 ml vs. 16 fl oz (UK) = 455 ml.
• ✗Confusing fluid ounce (volume) with avoirdupois ounce (mass).
• ✗Assuming 1 fl oz = 1 oz by weight — only true for pure water and approximately.

What is the Fluid Ounce?

The US fluid ounce equals exactly 29.5735295625 milliliters and is the standard small-volume unit for beverages, cocktails, personal-care products, and cooking in the United States. It is distinct from the (weight) ounce: 1 fluid ounce of water weighs about 1 ounce by weight at room temperature, but other liquids may weigh more or less. Soft-drink cans (12 fl oz), beer bottles (12 fl oz), shampoo bottles, and skin-cream tubs all label volume in fluid ounces. The US fluid ounce is slightly different from the UK imperial fluid ounce (28.4131 mL — about 4% smaller), reflecting the different gallon definitions. The US fl oz relates to the gallon (128 fl oz = 1 gal), the cup (8 fl oz = 1 cup), the tablespoon (2 tbsp = 1 fl oz), and the milliliter (1 fl oz ≈ 29.57 mL). Cocktail recipes universally use fluid ounces.

• US beverage and soda can sizes (12 fl oz)
• Cosmetic and personal-care product volumes
• US fluid recipes and cocktail measures

What is the Cubic Inch?

The cubic inch equals exactly 16.387064 cubic centimeters and is the traditional American unit for engine displacement and small-volume manufacturing measurements. Classic American muscle cars were famously identified by their cubic-inch engine size: the Ford 'Boss 429' had a 429-cubic-inch (7.0-liter) V8, and the Chevrolet 'Big Block 454' was 7.4 liters. Modern American automakers have transitioned mostly to liter-based naming (e.g., 'Hemi 5.7'), but the cubic inch persists in vintage car culture and aviation engines. It is also used for printer-paper coverage and industrial tolerances. The cubic inch relates to the cubic foot (1,728 in³ = 1 ft³), the cubic centimeter (1 in³ ≈ 16.39 cm³), the milliliter (1 in³ ≈ 16.39 mL), and the US fluid ounce (1 fl oz ≈ 1.805 in³).

• Classic US car engine displacement
• Firearms chamber and cartridge specs
• Some US machining and mould design