Oz to Cups Converter
Convert fluid ounces to US cups and back with the exact 8 fl oz to 1 cup ratio. See tablespoon, pint, and millilitre equivalents, and check common container sizes in the reference table.
1 cup
- Formula used
- Formula used: 8 ÷ 8 = 1 cup
Also equals
Fluid ounces measure volume, not weight
This converter works on fluid ounces only. If a recipe asks for 8 oz of flour, sugar, or another dry ingredient by weight, that is not the same as 8 fl oz of liquid. Weigh dry ingredients on a scale instead.
oz to cups conversion table
Common container and recipe sizes, with their exact cup equivalents.
| Fluid ounces | Cups | Typical use |
|---|---|---|
| 4 fl oz | 0.5 | |
| 8 fl oz | 1 | Exactly 1 cup |
| 10 fl oz | 1.25 | |
| 12 fl oz | 1.5 | Standard soda can |
| 16 fl oz | 2 | US pint container |
| 20 fl oz | 2.5 | |
| 24 fl oz | 3 | |
| 32 fl oz | 4 | US quart / broth carton |
| 48 fl oz | 6 | |
| 64 fl oz | 8 | Half gallon jug |
One ratio, no guessing
Recipes list liquids in fluid ounces one minute and cups the next, and the two only line up if you remember that a US cup is exactly 8 fl oz. This page does that fixed division for you, in both directions, so you can move between a can label and a recipe card without reaching for a calculator.
Why use this oz to cups converter?
Exact US customary ratio
Built on the fixed 8 fl oz to 1 cup ratio used in every American recipe, with no rounding at any step.
Converts either way
Go from ounces to cups for a recipe, or cups to ounces for a can or bottle label. The swap button keeps the number you already typed.
Flags the dry-ounce trap
A built-in warning stops you from treating a weighed dry ingredient, like flour by the ounce, as if it were a fluid measurement.
A table for the sizes you already have
Common container sizes from 4 oz to a full gallon are listed with their cup equivalents, so you can read the answer without typing anything.
How this Oz to Cups Converter works
Type a number and this converter divides it by eight, because one US cup holds exactly eight US fluid ounces. That ratio comes from the same customary system as the US gallon: 128 fluid ounces make a gallon, and a cup is one-sixteenth of that gallon. Nothing here is rounded or approximate.
The conversion runs both ways. Switch to cups and the tool multiplies by eight instead, so two cups returns 16 fl oz, the size of a standard US pint carton.
A cup only means eight fluid ounces in the United States. A metric cup used in Australia and New Zealand is 250 ml, a Japanese cup is 200 ml, and older British recipes sometimes use a 10 fl oz cup. If a recipe comes from outside the US, check which cup it means before you measure.
The bigger trap sits inside American kitchens. Fluid ounces measure volume, the space a liquid takes up. Many recipes also list dry ingredients "by the ounce," and that figure is weight, not volume. A cup of flour weighs around 4.5 oz on a scale, nowhere near 8. If your ingredient is weighed rather than poured, convert it with a scale, not this page.
A decimal control sets how precise the answer is. Zero or one decimal place suits a recipe card; more helps when you are scaling a batch.
Everything runs in your browser. Nothing you type is sent anywhere.
How to use this Oz to Cups Converter
Pick the direction
Keep Ounces to Cups for a recipe amount in fl oz, or switch to Cups to Ounces when a recipe already lists cups and you need the fluid ounce total.
Enter the amount
Type any number or tap a common size such as 8, 16, or 32 oz. The result updates as you type, and the swap button flips the direction without losing your number.
Set the decimals and copy
Zero or one decimal place suits a recipe card. Copy the result with one tap, or read a common size straight off the table below.
Example Usage
A 16 oz can of broth, converted to cups for a recipe:
Frequently Asked Questions
How many cups is 8 oz?
How many cups is 16 oz?
How many cups is 32 oz?
How many cups is 64 oz?
Is 8 oz of flour the same as 1 cup of flour?
Does a cup of coffee equal 8 oz?
Is a US cup the same as a metric cup?
Why does a nutrition label round differently than this calculator?
Can I use this to convert dry ingredients like sugar or rice?
Is anything I type sent to a server?
Related Tools
Unit Converter
Convert between various units of measurement.
Oz to ML Converter
Convert fluid ounces to millilitres and back, in both US and UK imperial ounces, with a table of common bottle and cup sizes.
Pounds to Kg Calculator
Convert pounds to kilograms instantly, with stone support, a reverse kg to lbs mode, and a quick reference chart of common weights.
Oz to Lbs Converter
Convert ounces to pounds and back with the exact 16 oz to 1 lb ratio. See the lb + oz breakdown used on labels, plus a full oz to lbs chart.
Tbsp to Cup Converter
Convert tablespoons to cups and back with the exact 16 tbsp to 1 cup ratio. See the nearest recipe fraction, the tbsp + tsp breakdown, and a full conversion chart.
Millimeters to Inches Calculator
Convert millimeters to inches (decimal, fraction, and feet+inches) or inches to millimeters.
The Oz to Cups Converter is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.
