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What is a fluid ounce?

Volume unit for US beverages and cosmetics — not the same as mass ounce

Definition

The US fluid ounce equals 29.5735 millilitres — 1/128 of a US gallon. The UK fluid ounce (28.41 ml) is slightly smaller. Used for beverage can sizes in the US, cosmetic product sizes and many US cooking recipes. Do not confuse with the ounce of mass (28.35 g).

Common uses

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

🌍 Real-world scale

A US soda can is 12 fl oz (355 ml). A Starbucks Tall is 12 fl oz; Grande is 16; Venti is 20.

Convert from fluid ounces

14 conversions
Fluid Ounce to Liter1 fl oz = 0.02957 LFluid Ounce to Milliliter1 fl oz = 29.5735 mlFluid Ounce to Cubic Meter1 fl oz = 2.9574e-5 m³Fluid Ounce to US Gallon1 fl oz = 0.007813 gal (US)Fluid Ounce to UK Gallon1 fl oz = 0.006505 gal (UK)Fluid Ounce to Cup1 fl oz = 0.1232 cupFluid Ounce to Pint1 fl oz = 0.0625 ptFluid Ounce to Quart1 fl oz = 0.03125 qtFluid Ounce to Tablespoon1 fl oz = 1.99821 tbspFluid Ounce to Teaspoon1 fl oz = 6 tspFluid Ounce to Barrel1 fl oz = 0.000186 bblFluid Ounce to Cubic Inch1 fl oz = 1.80469 in³Fluid Ounce to Cubic Foot1 fl oz = 0.001044 ft³Fluid Ounce to Cubic Yard1 fl oz = 3.8681e-5 yd³

Convert to fluid ounces

14 conversions
Liter to Fluid Ounce1 L = 33.814 fl ozMilliliter to Fluid Ounce1 ml = 0.03381 fl ozCubic Meter to Fluid Ounce1 m³ = 33,814.02 fl ozUS Gallon to Fluid Ounce1 gal (US) = 128 fl ozUK Gallon to Fluid Ounce1 gal (UK) = 153.722 fl ozCup to Fluid Ounce1 cup = 8.11537 fl ozPint to Fluid Ounce1 pt = 16 fl ozQuart to Fluid Ounce1 qt = 32 fl ozTablespoon to Fluid Ounce1 tbsp = 0.5004 fl ozTeaspoon to Fluid Ounce1 tsp = 0.1667 fl ozBarrel to Fluid Ounce1 bbl = 5,376 fl ozCubic Inch to Fluid Ounce1 in³ = 0.5541 fl ozCubic Foot to Fluid Ounce1 ft³ = 957.506 fl ozCubic Yard to Fluid Ounce1 yd³ = 25,852.68 fl oz

Tips

  • 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.

Common mistakes

  • 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.

FAQ about the fluid ounce

What is a fluid ounce?
The US fluid ounce equals 29.5735 millilitres — 1/128 of a US gallon. The UK fluid ounce (28.41 ml) is slightly smaller. Used for beverage can sizes in the US, cosmetic product sizes and many US cooking recipes. Do not confuse with the ounce of mass (28.35 g).
Where is the fluid ounce used?
The fluid ounce is commonly used for: US beverage and soda can sizes (12 fl oz); Cosmetic and personal-care product volumes; US fluid recipes and cocktail measures.
What is an example of a fluid ounce in real life?
A US soda can is 12 fl oz (355 ml). A Starbucks Tall is 12 fl oz; Grande is 16; Venti is 20.
What category does the fluid ounce belong to?
The fluid ounce is a unit of volume, part of the 15-unit volume category on UnitConv.
How accurate are fluid ounce conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
Explore all 15 volume units and their conversions.🧪 Volume hub →