Enter fluid ounces and get cups straight away, plus milliliters, pints and tablespoons. Switch between US and UK imperial measures, or flip the direction to turn cups into ounces.
Fluid ounces measure volume, not weight. Runs in your browser. Nothing you type is sent anywhere.
This ounces to cups converter is for cooks, bartenders and anyone reading a drink or recipe label. It divides fluid ounces by the number of ounces in one cup, which is 8 in the US and 10 in the UK imperial system, and also shows the same amount in ml so you can use a metric jug.
How Many Ounces Are in a Cup?
There are 8 US fluid ounces in one US cup, so to convert ounces to cups you divide by 8. For example, 12 fl oz divided by 8 is 1.5 cups, or about 354.88 ml. In the UK imperial system a cup is 10 imperial fluid ounces, so 12 fl oz is 1.2 imperial cups.
What Is the Formula for Ounces to Cups?
The formula is cups = fluid ounces ÷ 8 for US measures, and cups = fluid ounces ÷ 10 for UK imperial measures.
UK: cups = fl oz ÷ 10 (1 imperial fl oz = 28.4131 ml)
cups to ounces: fl oz = cups × 8 (US) or × 10 (UK)
A US fluid ounce is 1/128 of a US gallon, about 29.57 ml, and the US customary cup holds 8 of them. An imperial fluid ounce is 1/20 of an imperial pint under the UK Weights and Measures Act, about 28.41 ml, so a half pint imperial cup holds 10 of them. The two ounces are close in size, but the cups are not.
What Is the Difference Between a Fluid Ounce and a Weight Ounce?
A fluid ounce measures volume, the space a liquid fills, while a weight ounce measures mass on a scale. The weight ounce is the avoirdupois ounce, exactly 28.349523125 grams. For water the two are nearly the same, because 8 fl oz of water weighs about 8.3 oz. For flour, sugar or oats they are very different: a cup of flour weighs far less than 8 ounces. If a recipe gives dry ingredients by weight, convert with the grams to ounces converter first and then use the grams to cups converter, which uses the density of each ingredient.
Ounces to Cups Conversion Table
Values from this tool. US uses 8 fl oz per cup, UK uses 10 imperial fl oz per cup.
| Fl oz | US cups | US ml | UK cups | UK ml |
|---|---|---|---|---|
| 1 | 0.125 (1/8) | 29.57 | 0.1 | 28.41 |
| 2 | 0.25 (1/4) | 59.15 | 0.2 | 56.83 |
| 4 | 0.5 (1/2) | 118.29 | 0.4 | 113.65 |
| 6 | 0.75 (3/4) | 177.44 | 0.6 | 170.48 |
| 8 | 1 | 236.59 | 0.8 | 227.3 |
| 10 | 1.25 (1 1/4) | 295.74 | 1 | 284.13 |
| 12 | 1.5 (1 1/2) | 354.88 | 1.2 | 340.96 |
| 16 | 2 | 473.18 | 1.6 | 454.61 |
| 20 | 2.5 (2 1/2) | 591.47 | 2 | 568.26 |
| 32 | 4 | 946.35 | 3.2 | 909.22 |
| 64 | 8 | 1,892.71 | 6.4 | 1,818.44 |
Is a Can of Soda 1.5 Cups?
Yes, a standard 12 fl oz US can holds 1.5 US cups, which is 354.88 ml (cans are usually labeled 355 ml). To go straight from ml to ounces for other bottles, the ml to oz converter does it in one step. In UK mode the tablespoon box uses the 15 ml metric tablespoon.
Worked Example
A smoothie recipe from the US calls for 12 fl oz of orange juice. Type 12 with US selected: the tool shows 1.5 cups (1 1/2 US cups), 354.88 ml, 0.75 pints and 24 tablespoons. Switch to UK imperial and the same 12 fl oz becomes 1.2 cups and 340.96 ml, because imperial ounces and cups are a different size. Flip to cups to fl oz and type 2: you get 16 fl oz in US or 20 fl oz in UK.
How Do You Use the Ounces to Cups Converter?
Pick a direction
Choose fl oz to cups, or cups to fl oz if your recipe gives cups.
Choose US or UK
Pick US for American recipes and labels, or UK imperial for older British recipes.
Type the amount
Enter the number of fluid ounces or cups. Fractions such as 1/2 work.
Read the result
The big number is your answer, with ml, pints and tablespoons in the boxes below.
Frequently Asked Questions
How many cups is 16 ounces?
16 US fluid ounces is exactly 2 US cups, or 1 US pint, which is about 473.18 ml. In the UK imperial system 16 fluid ounces is 1.6 imperial cups, or about 454.61 ml.
How many ounces is 3/4 of a cup?
Three quarters of a US cup is 6 US fluid ounces, about 177.44 ml. Three quarters of a UK imperial cup is 7.5 imperial fluid ounces, about 213.1 ml.
Is 8 oz always 1 cup?
8 fluid ounces is 1 US cup of liquid. 8 ounces by weight is not always a cup, because a cup of flour or sugar weighs a different amount. A cup of water weighs about 8.3 ounces, so the two are only close for water.
How many cups are in 100 fluid ounces?
100 US fluid ounces is 12.5 US cups, about 2,957.35 ml or roughly 3 liters. 100 imperial fluid ounces is 10 imperial cups or 5 imperial pints, about 2,841.31 ml.
How many tablespoons are in a fluid ounce?
One US fluid ounce holds 2 US tablespoons, so 1 US cup of 8 fl oz equals 16 tablespoons. This tool uses that 2 to 1 ratio in its tablespoon box for the US setting.
Why is a UK cup bigger than a US cup?
A UK imperial cup is half an imperial pint, 10 imperial fluid ounces or about 284.13 ml. A US cup is half a US pint, 8 US fluid ounces or about 236.59 ml. The UK pint is 20 ounces, the US pint 16.
Sources and Further Reading
- NIST Guide to the SI, Appendix B.9: conversion factors (fluid ounce, cup, ounce)
- UK Weights and Measures Act 1985, Schedule 1 (fluid ounce = 1/20 pint)
- FDA nutrition labeling rule, 21 CFR 101.9 (household measures)
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Last reviewed: October 2026