Convert between US fluid ounces (fl oz) and cups — and back again. Get instant conversions with multiple unit equivalents. Supports both directions: fl oz to cups and cups to fl oz.
The term "cup" has different meanings depending on the region and context. This converter uses US customary cups, but here's how they compare:
8 fl oz = 236.588 mL
Used in American recipes and this converter
240 mL (defined by FDA)
Used on nutrition labels; slightly larger
250 mL
Common in metric recipes and some countries
10 fl oz = 284.131 mL
Larger than US cup; used in UK and Commonwealth
200 mL
Smaller; common in Japanese cooking
250 mL
Same as metric cup; used in Australian recipes
Pro Tip: When following recipes from different countries or regions, always check which cup measurement is used. A significant recipe error can occur if you mix up US cups with metric or UK cups!
Fluid ounces (fl oz) and cups are volume measurements commonly used in the United States for cooking, baking, and measuring liquids. Unlike ounces (oz), which measure weight, fluid ounces measure volume or capacity.
The US cup is a standard measurement unit equal to 8 fluid ounces or approximately 236.588 milliliters. It's one of the most common measurements in American recipes and is particularly useful for measuring liquid ingredients like water, milk, oil, and juice.
Understanding the relationship between fluid ounces and cups is essential for recipe conversions, especially when scaling recipes up or down, or when converting between US and metric measurements. This converter makes these conversions instant and accurate.
Quick reference table for converting between fluid ounces and cups. All values based on US measurements (1 cup = 8 fl oz).
| Fluid Ounces (fl oz) | US Cups | Milliliters (mL) | Common Fraction |
|---|---|---|---|
| 1 fl oz | 0.125 | 29.57 | 1/8 cup |
| 2 fl oz | 0.25 | 59.15 | 1/4 cup |
| 3 fl oz | 0.375 | 88.72 | 3/8 cup |
| 4 fl oz | 0.5 | 118.29 | 1/2 cup |
| 5 fl oz | 0.625 | 147.87 | 5/8 cup |
| 6 fl oz | 0.75 | 177.44 | 3/4 cup |
| 7 fl oz | 0.875 | 207.02 | 7/8 cup |
| 8 fl oz | 1 | 236.59 | 1 cup (8 fl oz) |
| 10 fl oz | 1.25 | 295.74 | 1 1/4 cups |
| 12 fl oz | 1.5 | 354.88 | 1 1/2 cups |
| 14 fl oz | 1.75 | 414.03 | 1 3/4 cups |
| 16 fl oz | 2 | 473.18 | 2 cups (1 pint) |
| 20 fl oz | 2.5 | 591.47 | 2 1/2 cups |
| 24 fl oz | 3 | 709.77 | 3 cups (3/4 quart) |
| 32 fl oz | 4 | 946.35 | 4 cups (1 quart) |
| 64 fl oz | 8 | 1892.71 | 8 cups (2 quarts) |
| 128 fl oz | 16 | 3785.41 | 16 cups (1 gallon) |
Converting 24 fluid ounces to cups:
24 fluid ounces is equal to 3 cups, which is also 3/4 of a quart.
Converting 2.5 cups to fluid ounces:
2.5 cups equals 20 fluid ounces, which is also 2.5 pints.
One of the most practical uses for converting between fluid ounces and cups is scaling recipes up or down. Whether you're cooking for a dinner party or reducing a recipe for one person, understanding how to adjust liquid measurements is essential.
Divide the desired number of servings by the original recipe's servings. For example, if a recipe serves 4 but you need 8 servings, your scaling factor is 2.
Take each ingredient's liquid measurement and multiply by your scaling factor. Use this converter to switch between cups and fl oz as needed for easier math.
Use this converter to translate results into easy-to-measure amounts. For example, 20 fl oz converts to 2.5 cups, which is easier to measure than working with decimals.
Remember: you should also scale dry ingredients, seasonings, and other components. Liquids are just one part of the equation.
Original Recipe (Serves 4):
Scaled Up (Serves 12 — Scaling Factor: 3×):
While this converter is perfect for switching between cups and fluid ounces, it's worth understanding when volume measurements are ideal versus when weight measurements are more accurate.
❌ Mistake: Scooping flour directly from the bag into measuring cups compacts it, resulting in too much flour and dense baked goods.
✓ Fix: Spoon flour into the cup and level with a knife, or use a kitchen scale for baking.
❌ Mistake: Using the same measuring cup for wet and dry ingredients without washing between (flour residue affects liquid volume).
✓ Fix: Use separate liquid measuring cups (with a pour spout) and dry measuring cups.
❌ Mistake: Leveling dry ingredients with a shaking motion, which compacts them further.
✓ Fix: Gently level with a straight edge (like a knife) without applying pressure.
While 1 cup always equals 8 fl oz for volume, the weight varies dramatically by ingredient. Here's why understanding ingredient density matters for consistent cooking and baking:
| Ingredient | 1 Cup (Volume) | Typical Weight | Notes |
|---|---|---|---|
| Water | 8 fl oz | 236.6g | Baseline; 1:1 ratio of volume to weight (in mL to grams) |
| Milk | 8 fl oz | 240g | Slightly denser than water due to fat and milk solids |
| Olive Oil | 8 fl oz | 218g | Less dense than water; floats on top |
| Flour (scooped) | 8 fl oz | 120–140g | Varies significantly; compaction affects weight greatly |
| Flour (spooned) | 8 fl oz | 110–125g | More consistent when spooned gently and leveled |
| Granulated Sugar | 8 fl oz | 200g | Consistent; denser than flour due to crystal size |
| Brown Sugar (packed) | 8 fl oz | 220g | Varies by moisture content; packed versions weigh more |
| Butter | 8 fl oz | 227g | Note: 1 cup butter = 2 sticks (225–227g) |
| Honey | 8 fl oz | 256g | Very dense; 1 cup honey weighs more than water |
| Cocoa Powder | 8 fl oz | 85g | Light and airy; much less dense than flour |
Key Takeaway: If a recipe doesn't specify "scooped and leveled" or doesn't provide weight measurements, results can vary. For consistent baking, especially with flour, consider using a kitchen scale to measure in grams instead of relying solely on cup measurements.
There are exactly 8 fluid ounces in 1 US cup. This is a standard measurement used in American cooking and baking recipes.
6 fluid ounces equals 0.75 cups, or 3/4 cup. You can also express this as 6 fl oz = 177.44 milliliters.
To convert cups to fluid ounces, multiply the number of cups by 8. For example: 2 cups × 8 = 16 fl oz. Use the "Cups → fl oz" mode in the tool above for instant conversions.
No. Fluid ounces (fl oz) measure volume/capacity, while ounces (oz) measure weight/mass. They are different units for different types of measurements.
16 fluid ounces equals 2 cups. This is also equal to 1 pint in the US measurement system.
A US cup is 8 fl oz (236.588 mL), while a UK cup is typically 10 imperial fl oz (284.131 mL). This converter uses US measurements. See the "Not All Cups Are the Same" section for detailed cup comparisons.
1 US cup equals approximately 236.588 milliliters. This converter shows the mL equivalent automatically for all conversions.
While you can use volume measurements for dry ingredients, weight (using a kitchen scale) is more accurate for baking. Different dry ingredients have different densities, which affects consistency.
There are 16 tablespoons in 1 cup. Since 1 tablespoon equals 0.5 fl oz, this means 16 tbsp × 0.5 fl oz = 8 fl oz = 1 cup.
1 US cup equals approximately 237 mL (rounded) or 236.588 mL (exact). Many metric recipes use 250 mL as a "metric cup" for convenience.
Flour density varies based on how it's packed, scooped, or stored. A loosely-packed cup of flour can weigh 15–20% less than a compacted cup. For consistent results, use a kitchen scale or measure flour by spooning gently into the cup and leveling.
Determine your scaling factor (desired servings ÷ original servings), then multiply all ingredient amounts. Use this converter to translate scaled measurements into practical amounts. Remember to scale both wet and dry ingredients proportionally.
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