Convert volume units — liters, gallons, cups, milliliters, cubic meters, pints, quarts.
| Unit | Name | Value |
|---|---|---|
| L | Liter | 0.236588 |
| mL | Milliliter | 236.588 |
| m³ | Cubic Meter | 0.000236588 |
| gal(US) | US Gallon | 0.062499967 |
| gal(UK) | UK Gallon | 0.052042085 |
| qt | US Quart | 0.24999974 |
| pt | US Pint | 0.5 |
| fl oz | Fluid Ounce | 8 |
Common us cup values converted to fluid ounce — factor: 1 cup = 8 fl oz
| US Cup (cup) | Fluid Ounce (fl oz) | Context |
|---|---|---|
| 0.0625 cup | 0.5 fl oz | Tablespoon |
| 0.125 cup | 1 fl oz | Eighth cup |
| 0.25 cup | 2 fl oz | Quarter cup |
| 0.333 cup | 2.664 fl oz | Third cup |
| 0.5 cup | 4 fl oz | Half cup |
| 1 cup | 8 fl oz | One cup |
| 2 cup | 16 fl oz | One pint |
| 4 cup | 32 fl oz | One quart |
| 8 cup | 64 fl oz | Half gallon |
| 16 cup | 128 fl oz | One gallon |
| 32 cup | 256 fl oz | 2 gallons |
| 64 cup | 512 fl oz | 4 gallons |
| 128 cup | 1,024 fl oz | 8 gallons |
| 256 cup | 2,048 fl oz | Large drum |
| 512 cup | 4,096 fl oz | Large drum |
Converting us cup to fluid ounce comes up frequently in cooking, chemistry, medicine, and engineering. A recipe written in metric units may need to be adapted for a kitchen using fluid ounce, or a laboratory protocol may specify volumes in us cup that need to be measured with equipment calibrated in fluid ounce.
In everyday use, knowing that 5 cup = 40 fl oz and 10 cup = 80 fl oz covers most common situations. For bulk calculations, 100 cup = 800 fl oz is a useful anchor. The reverse conversion — fluid ounce back to us cup — uses the factor 0.125, so 1 fl oz = 0.125 cup.
All conversions use the internationally recognized factor of exactly 1 cup = 8 fl oz. Calculations are performed in IEEE 754 double-precision floating point, giving accuracy to at least 8 significant figures — more than sufficient for any practical application.
Formula: Fluid Ounce = US Cup × 8
Multiply any us cup value by 8 to get fluid ounce. One us cup equals 8 fl oz.
Reverse: US Cup = Fluid Ounce × 0.125
Cups × 8 = fluid ounces. One cup = exactly eight fl oz.
½ cup = 4 fl oz, ¼ cup = 2 fl oz.
fl oz ÷ 8 = cups.
Follows American recipes using cups for flour, sugar, milk, and butter.
Tests and standardizes recipes in cup measurements before international publication.
Uses cup portions as standardized serving-size references for dietary counseling.
Teaches beginner cooks using cups as intuitive, equipment-free measuring tools.
Converts cup-based recipes to liter or kilogram quantities for industrial production.
Converts US cup measurements to metric mL when cooking American recipes abroad.
The US customary cup is defined as exactly 8 US fluid ounces, or 236.588 mL. It was standardized by Fannie Farmer in her 1896 cookbook The Boston Cooking-School Cook Book.
The cup is the backbone of US baking: nearly every American recipe uses cup measurements for flour, sugar, butter, and liquids. Standard sets include 1 cup, ½ cup, ⅓ cup, and ¼ cup.
Interesting fact: Australia uses a metric cup of 250 mL, slightly larger than the US cup, which can cause recipe confusion in international cooking.
The US fluid ounce is defined as 1/128 of a US gallon, exactly 29.5735 mL. The US and UK fl oz differ: the US is 29.57 mL while the Imperial fl oz is 28.41 mL.
Fluid ounces appear on every US beverage container: a soda can is 12 fl oz, a water bottle is 16.9 fl oz, and a US shot glass is 1.5 fl oz.
Interesting fact: Despite sharing the name 'ounce', the fluid ounce measures volume, not weight. One fl oz of water weighs about 1.04 oz, but one fl oz of honey weighs about 1.5 oz.