🥤 Kitchen Converter

Oz to Cups
Converter

Convert fluid ounces to cups (and back) instantly — US, UK, and Metric cup standards, fractions, and full kitchen unit equivalents for cooking and baking.

⚡ Fast Kitchen Conversions

🍳 Cooking & Baking Friendly

📏 Accurate Measurements

Common recipe amounts

1 US cup = 8 fl oz

1 UK cup = 10 fl oz

1 fl oz = 2 tbsp

1 fl oz = 29.6 mL

Enter your measurement

Fluid Ounces (fl oz)

Cup standard

Cup fill

Converted result

—cups

≈ — (fraction)

Cup fill visualisation (0 to 4 cups)

01 cup2 cups3 cups4 cups

Millilitres

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Litres

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Tablespoons

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Teaspoons

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US Cups

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UK Cups

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🍳 Kitchen tip:
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📏 Conversion values are based on standard US fluid ounces and may vary slightly between UK, Metric, and US cup standards. For baking, always use the measuring system specified in your recipe.

Oz to Cups Converter: Convert Fluid Ounces Instantly

Whether you’re following a recipe from a US cookbook, scaling up a batch for a dinner party, or working out how many cups are in that carton of stock — knowing how to convert fluid ounces to cups is a fundamental kitchen skill. This free oz to cups converter handles US, UK, and Metric cup standards, shows fraction equivalents for baking precision, and displays simultaneous conversions to millilitres, litres, tablespoons, and teaspoons.

🥤 The key formula: Cups = Fluid ounces ÷ 8 (US) · Fluid ounces ÷ 10 (UK) · Fluid ounces ÷ 8.454 (Metric, 250mL cup)

Most common conversions: 8 fl oz = 1 cup · 16 fl oz = 2 cups · 4 fl oz = ½ cup · 2 fl oz = ¼ cup · 32 fl oz = 4 cups (1 quart)

Fluid Ounces to Cups Reference Table

Fluid Ounces	US Cups	UK Cups	Metric (mL)	Tablespoons
1 fl oz	⅛ cup	⅒ cup	29.6 mL	2 tbsp
2 fl oz	¼ cup	⅕ cup	59.1 mL	4 tbsp
4 fl oz	½ cup	⅖ cup	118.3 mL	8 tbsp
6 fl oz	¾ cup	⅗ cup	177.4 mL	12 tbsp
8 fl oz	1 cup	⅘ cup	236.6 mL	16 tbsp
12 fl oz	1½ cups	1⅕ cups	354.9 mL	24 tbsp
16 fl oz	2 cups	1⅗ cups	473.2 mL	32 tbsp
32 fl oz	4 cups (1 qt)	3⅕ cups	946.4 mL	64 tbsp

US vs UK Cups Explained

The most common confusion in kitchen measurement comes from the fact that US and UK cups are different sizes. A US cup holds 8 fluid ounces (236.6 mL). A UK/Imperial cup holds 10 fluid ounces (284.1 mL) — 20% larger. An Australian cup follows the Metric standard at 250 mL (about 8.45 fl oz).

This difference matters enormously in baking. If a UK recipe calls for 2 cups of flour and you measure with US cups, you’ll use 480 mL instead of 568 mL — a 15% shortfall that can affect the final texture significantly.

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Fluid ounces vs dry ounces

Fluid ounces measure volume (how much space liquid takes up). Dry ounces measure weight. They’re not interchangeable — 8 fl oz of honey weighs about 12 oz (340g) because honey is denser than water. For liquids, use fluid ounces; for dry ingredients, use weight ounces or grams.

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Baking precision

In baking, accurate measurement is critical. A ½ oz difference in flour can affect gluten development; a difference in liquid can alter texture. For consistent results, use a kitchen scale for dry ingredients and a clear liquid measuring cup at eye level for liquids.

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Recipe scaling

Use this converter when scaling recipes up or down. If a recipe calls for 6 fl oz of milk and you want to double it, convert 12 fl oz → 1½ US cups. For precise scaling of baked goods, maintain ratios rather than simply doubling all measurements.

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Temperature of liquids

Volume measurements can vary slightly with temperature — hot liquids expand slightly. For cooking (soups, sauces), this is insignificant. For precision baking or scientific applications where temperature matters, measure liquids at room temperature.

Related Kitchen Calculators

Frequently Asked Questions

How many ounces are in a cup?

In the US measurement system, 1 cup = 8 fluid ounces. In the UK/Imperial system, 1 cup = 10 fluid ounces. In the Metric system (used in Australia, Canada), 1 cup = 250 mL = approximately 8.45 fluid ounces. The US standard (1 cup = 8 fl oz) is the most commonly cited in recipes worldwide, particularly online and in American cookbooks. When following a recipe, check which country it’s from to confirm the cup standard used.

Is 8 oz equal to 1 cup?

Yes — in the US measurement system, 8 fluid ounces equals exactly 1 cup. This is the standard relationship used in all American recipes and most international recipe conversions. To convert fluid ounces to cups, simply divide by 8. To convert cups to fluid ounces, multiply by 8. Note: this applies to fluid ounces (volume measurement), not weight ounces. 8 oz of water = 1 cup, but 8 oz of honey ≠ 1 cup because honey is denser than water.

What is the difference between fluid ounces and weight ounces?

Fluid ounces (fl oz) measure volume — the amount of space a liquid takes up. Weight ounces (oz) measure mass — how heavy something is. For water, 1 fl oz ≈ 1 oz weight because water has a density of approximately 1 g/mL. But for other liquids and ingredients, they differ significantly. 1 fl oz of honey weighs about 1.5 oz because honey is denser. 1 fl oz of oil weighs about 0.9 oz because oil is lighter than water. For cooking, use fl oz for liquids and weight oz (or grams) for dry ingredients.

Are US and UK cups the same size?

No — US and UK cups are different sizes. A US cup holds 8 fl oz (236.6 mL). A UK/Imperial cup holds 10 fl oz (284.1 mL) — 20% larger. An Australian metric cup holds 250 mL (~8.45 fl oz). This difference is significant in baking. If a UK recipe calls for 3 cups of liquid, that’s 30 fl oz — but using US cups would only give 24 fl oz, a 20% shortfall. This converter handles all three systems — use the cup standard selector to match your recipe’s origin.

Can I use this converter for baking?

Yes — the converter is ideal for baking conversions. It provides fraction equivalents (¼ cup, ½ cup, ¾ cup) which are the standard measurements in baking recipes, and shows millilitre equivalents for metric precision. For best baking results: use fluid ounces or millilitres for liquid ingredients, use weight (grams or ounces) for dry ingredients like flour and sugar, and always use the same measuring cup standard throughout a recipe.

What is a metric cup?

A metric cup is 250 millilitres exactly. It’s the standard cup measurement used in Australia, New Zealand, Canada, and other metric countries. It differs slightly from the US cup (236.6 mL) and significantly from the UK cup (284 mL). When following recipes from these countries, select “Metric Cup” in this converter to get accurate results. The difference between a metric cup and a US cup is small enough that it rarely matters for cooking, but can be relevant in precision baking.

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Fluid ounces to cups, US/UK/Metric standards, fractions, and 6 unit equivalents — free and instant.

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