Fluid Ounce (fl oz)
A US customary unit of volume equal to 1/128 of a gallon
The Fluid Ounce (fl oz) is a unit of volume that developed alongside the needs of commerce, cooking, and chemistry. Volume measurement was crucial for trade in liquids like wine, oil, and grain, leading to a profusion of regional standards that varied even between neighboring towns. The metric system's liter and its multiples brought standardization to most of the world, though the US customary volume system of cups, pints, quarts, and gallons persists in American cooking and everyday use. The Fluid Ounce belongs to one of these traditions.
Accurate volume measurement is critical in engineering, science, commerce, and everyday life. Using the correct unit and applying conversions precisely prevents errors that can be costly or dangerous in professional applications.
Conversion Table
| Unit | Symbol | 1 fl oz = |
|---|---|---|
| Liter | L | 0.0295735 L |
| Milliliter | mL | 29.5735 mL |
| Gallon (US) | gal | 0.0078125 gal |
| Cup | cup | 0.125 cup |
| Tablespoon | tbsp | 1.99999 tbsp |
| Teaspoon | tsp | 6 tsp |
| Pint | pt | 0.0625 pt |
| Quart | qt | 0.03125 qt |
Conversions Involving Fluid Ounce
Liter → Fluid Ounce
L → fl oz
Milliliter → Fluid Ounce
mL → fl oz
Gallon (US) → Fluid Ounce
gal → fl oz
Fluid Ounce → Liter
fl oz → L
Fluid Ounce → Milliliter
fl oz → mL
Fluid Ounce → Gallon (US)
fl oz → gal
Fluid Ounce → Cup
fl oz → cup
Fluid Ounce → Tablespoon
fl oz → tbsp
Fluid Ounce → Teaspoon
fl oz → tsp
Fluid Ounce → Pint
fl oz → pt
Fluid Ounce → Quart
fl oz → qt
Cup → Fluid Ounce
cup → fl oz
Tablespoon → Fluid Ounce
tbsp → fl oz
Teaspoon → Fluid Ounce
tsp → fl oz
Pint → Fluid Ounce
pt → fl oz
Quart → Fluid Ounce
qt → fl oz
Common Uses of the Fluid Ounce
- •Cooking — measuring liquid ingredients in recipes
- •Fuel and fluid systems — sizing tanks, reservoirs, and pipelines
- •Chemistry — measuring solutions and reagents in laboratory procedures
- •Medicine — prescribing and administering liquid medications
- •Environmental science — measuring water discharge and rainfall volume
Did You Know?
The liter was originally defined in 1795 as the volume of one kilogram of water at 4°C — creating a convenient link between mass and volume for water. The Fluid Ounce is part of the broader volume measurement story that connects everyday cooking to industrial fluid handling.