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Ounces to Cups Calculator

Convert fluid ounces to cups (and cups back to fluid ounces) for any recipe. Switch between US legal, US customary, metric, UK and Japanese cup sizes, and choose between US or UK (imperial) fluid ounces — the conversion updates instantly.

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Created by

Daniel Whitman

Reviewed by

Portrait of Hannah Brooks, calculator reviewerHannah Brooks

Ounces to cups converter

Result
0.9858
us legal cup(s)
Input
8 US fl oz
In millilitres
236.59 ml
In litres
0.2366 L
In tablespoons (US)
16

Quick rule: with US fluid ounces and US legal cups, divide ounces by 8 to get cups (and multiply cups by 8 to get ounces).

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How this oz to cups converter works

Every conversion uses millilitres as the common unit. The calculator multiplies your input by the volume of one fluid ounce in your chosen system (≈ 29.5735 ml for US fl oz or ≈ 28.4131 ml for UK fl oz) and then divides by the volume of one cup in your chosen cup definition. With US fluid ounces and US legal cups, the math collapses to the familiar rule: divide ounces by 8 to get cups, or multiply cups by 8 to get ounces.

A cup is not the same everywhere. A US legal cup is 240 ml, a US customary cup is about 236.6 ml, a metric cup (Australia/NZ) is 250 ml, a UK cup is about 284.1 ml, and a Japanese cup is 200 ml. Picking the right cup type matters for baking — small differences add up across a recipe.

Fluid ounce & cup conversion tables

Quick-glance charts for the most common conversions plus the official volume of every cup and ounce definition used around the world.

US fl oz → US legal cups (240 ml)

Chart
Fluid ouncesCupsMillilitres
1 fl oz0.123229.574
2 fl oz0.246459.147
3 fl oz0.369788.721
4 fl oz0.4929118.29
5 fl oz0.6161147.87
6 fl oz0.7393177.44
7 fl oz0.8626207.01
8 fl oz0.9858236.59
12 fl oz1.479354.88
16 fl oz1.972473.18
20 fl oz2.464591.47
24 fl oz2.957709.76
32 fl oz3.943946.35
40 fl oz4.9291,182.94

US legal cups → US fl oz

Chart
CupsFluid ouncesMillilitres
0.1251.01430
0.252.02960
0.3332.70279.92
0.54.058120
0.6675.413160.08
0.756.087180
18.115240
1.512.173360
216.231480
2.520.288600
324.346720
432.461960

Cup definitions around the world

Reference
Cup typeVolume (ml)Notes
US legal cup240Used for nutrition labels & recipes
US customary cup236.59Half a US liquid pint
Metric cup250Common in Australia & New Zealand
UK cup284.13Half an imperial pint
Japanese cup200Used for rice and sake
Coffee cup118≈ 4 fl oz, brewed coffee

Fluid ounce definitions

Reference
Ounce typeVolume (ml)Notes
US fluid ounce29.5735Used in the United States
UK (imperial) fluid ounce28.4131Used in the UK & Commonwealth

Frequently asked questions

How many fluid ounces are in a cup?
In the US, one cup equals 8 fluid ounces. So 2 cups = 16 fl oz, 3 cups = 24 fl oz and 0.5 cup = 4 fl oz. The converter above handles other cup sizes (metric, UK, Japanese) automatically.
How do I convert fl oz to cups?
Divide the fluid ounces by 8 (US fl oz to US legal cups). For example: 4 fl oz = 0.5 cup, 8 fl oz = 1 cup, 16 fl oz = 2 cups, 20 fl oz = 2.5 cups.
Is a US cup the same as a UK cup?
No. A US legal cup is 240 ml, US customary is ≈ 236.6 ml, metric is 250 ml, UK is ≈ 284.1 ml (half an imperial pint), and Japanese is 200 ml.
What is the difference between US and UK fluid ounces?
A US fluid ounce ≈ 29.5735 ml; a UK (imperial) fluid ounce ≈ 28.4131 ml. UK fl oz are slightly smaller.
How much is 6 oz in cups?
6 US fluid ounces equals 0.75 cup (3/4 cup), because one US legal cup contains 8 fluid ounces and 6 ÷ 8 = 0.75.
Is this converter free?
Yes — free and runs entirely in your browser, with no account. Contact the team if you have feedback.

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