1 US customary cup = 8 US fluid ounces. For ounces by weight, choose an ingredient.
Match a recipe to your measuring jug, spoons or scale. Choose the unit standard or the ingredient before you convert.
Cup and fluid ounce converter
Most Asked
1 kg ≈ 2.205 lbKilograms to Pounds
International avoirdupois pound
1 cup = 8 fl ozCups to Ounces
US customary cup and US fluid ounce
16 oz = 1 lbOunces to Pounds
Avoirdupois ounces by weight
1 qt = 4 cupsQuarts to Cups
US liquid quart and US customary cup
1 tbsp = 3 tspTablespoons to Teaspoons
US customary tablespoon and teaspoon
1 cup = 16 tbspCups to Tablespoons
US customary cup and tablespoon
1 gal = 128 fl ozGallons to Fluid Ounces
US liquid gallon and US fluid ounce
1 gal = 4 qtGallons to Quarts
US liquid gallon and US liquid quart
28.35 g ≈ 1 ozGrams to Ounces
Avoirdupois ounce by weight
32 fl oz = 1 qtFluid Ounces to Quarts
US fluid ounce and US liquid quart
16 cups = 1 galCups to Gallons
US customary cup and US liquid gallon
453.6 g ≈ 1 lbGrams to Pounds
International avoirdupois pound
Conversions by Topic
Cooking
Measure recipe cups and spoons or find a verified food portion.
View all Cooking conversionsWeight
Convert the units on your scale, from milligrams to pounds.
View all Weight conversionsVolume
Use the correct standard when moving between jugs, recipes and containers.
View all Volume conversions12 kitchen conversions at a glance
Check the measure next to each number before using a shortcut.
Kitchen scale
- 1 kg ≈ 2.205 lbInternational avoirdupois pound
- 16 oz = 1 lbAvoirdupois ounces by weight
- 28.35 g ≈ 1 ozAvoirdupois ounce by weight
- 453.6 g ≈ 1 lbInternational avoirdupois pound
Cups and spoons
- 1 cup = 8 fl ozUS customary cup and US fluid ounce
- 1 tbsp = 3 tspUS customary tablespoon and teaspoon
- 1 cup = 16 tbspUS customary cup and tablespoon
Liquid containers
- 1 qt = 4 cupsUS liquid quart and US customary cup
- 1 gal = 128 fl ozUS liquid gallon and US fluid ounce
- 1 gal = 4 qtUS liquid gallon and US liquid quart
- 32 fl oz = 1 qtUS fluid ounce and US liquid quart
- 16 cups = 1 galUS customary cup and US liquid gallon
Ingredients: Cups to Grams
A cup of flour, a cup of butter and a cup of sugar have different weights. Open a food record to check the measured portion and preparation.
Butter
See how the published half-cup portion scales.
All-purpose flour
Use the spoon-and-level method for this source portion.
Granulated sugar
Weigh a portion of granulated white sugar.
Powdered sugar
Match the sugar and its sifting instructions.
Whole milk
Check the food description and the documented serving.
Active dry yeast
Use the named yeast and its documented spoon portion.
Garlic
Check the source’s cup, teaspoon or clove portion for raw garlic.
Blackberries
Check the form and serving for these berries.
Blueberries
Use the berry portion that matches your recipe.
Potatoes
Compare the preparation on the record with your cut.
Shredded cheese
Match the cheese type and shredded form.
Kitchen Tools & Printable Charts
Recipe Scaler
Adjust ingredient amounts for a different batch size.
Recipe Unit Converter
Convert between marked kitchen volume units.
Cups & Fluid Ounces Chart
Look up a US customary cup fraction.
Ingredient Cups-to-Grams Chart
Check the published household portion for a food.
Tablespoons & Teaspoons Chart
Read spoon fractions in US customary units.
US / Metric Kitchen Measures
Compare cup and spoon capacities in milliliters.
Kitchen Fractions Guide
Read and enter the fractions used in recipes.
Oven Temperature Chart
Find the Celsius equivalent of a Fahrenheit setting.
How We Measure
Unit conversions use exact definitions. Ingredient estimates use a named food and its published portion. Results are rounded only for display.
Methodology
See how unit standards, ingredient portions and rounding are handled.
Sources
Find the references behind the measurements and published portions.
Report an error
Send the units, ingredient or result so we can reproduce a problem.
Ingredient records last reviewed .
Guides
Compare cup sizes
Identify the measuring cup used in your recipe.
Fluid ounces and ounces
Read liquid markings and weight labels correctly.
Measure flour
Fill and level the cup for the selected portion.
Work with kitchen fractions
Use a fraction or mixed number to split a batch.
That is a volume relationship, so it works for any ingredient measured in the same cup. It does not tell you how much the ingredient weighs. Source: NIST measurement tables.
A quick check before you measure
- Read the unit. fl oz means fluid ounces; oz (weight) means mass.
- Check the standard. A US customary cup, a metric cup, and an Imperial cup are different volumes.
- Follow the recipe’s ingredient instructions. A source portion is useful only when it fits the ingredient and how you measure it.
To convert US fluid ounces back to US customary cups, divide by 8. The calculator can swap direction for you. Other cup and fluid-ounce combinations use their own relationship.
Does a cup of flour weigh 8 ounces?
The 8-fluid-ounce answer describes a US cup’s capacity. Flour needs a separate weight estimate based on the flour and its measurement method. Use the flour calculator.
Can I use the cup from my cupboard?
A drinking cup does not identify a measurement standard. Use a marked measuring vessel and check the recipe’s instructions. Our cup-size guide explains the choices in this calculator.
See how we calculate and where the figures come from.
How cup sizes compare in milliliters and US fluid ounces
One US customary cup is 8 US fluid ounces. Use this table to identify the cup in your recipe before you convert. The fluid-ounce column uses US fluid ounces throughout.
| Cup standard | Milliliters | US fl oz |
|---|---|---|
| ≈ 236.5882 | 8 | |
| 240 | ≈ 8.1154 | |
| 250 | ≈ 8.4535 | |
| ≈ 284.1306 | ≈ 9.6076 | |
| 200 | ≈ 6.7628 | |
| 180 | ≈ 6.0865 |
A nutrition label can use a 240 mL cup. A Japanese rice-cooker cup holds 180 mL. A recipe with an unspecified cup size needs the author’s standard.
Fluid ounces measure volume. If a recipe gives an ingredient weight, use the ingredient’s source portion or a scale.