Oz to Cups Converter
Unit ConversionConvert fluid ounces to cups: 1 fluid ounce equals exactly 0.125 cups. With a conversion table, the formula and every related volume converter.
Cups
Equivalent volume in cups
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Odeh Ahwal0people find this calculator helpful
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SponsoredThis calculator converts a volume in fluid ounces to US cups using the exact ratio: divide the fluid ounce value by 8. One fluid ounce is defined as exactly one 128th of a US gallon, and one cup as exactly one sixteenth of a gallon, so this conversion carries no rounding at all.
Fluid ounces to cups is one of the most common recipe conversions there is, since US measuring cups are marked in cup and half-cup increments while liquid ingredients like broth, milk, or oil are often sold or measured in fluid ounces on packaging. This page covers the liquid, fluid ounce measurement, not the dry ounce, a weight unit that depends on the density of whatever is being measured.
For the reverse direction, converting cups back into fluid ounces, see the related converters below.
Fluid Ounces to Cups Conversion Table
This table covers common recipe and packaging measurements.
| Fluid Ounces | Cups |
|---|---|
| 1 fl oz | 0.125 cups |
| 2 fl oz | 0.25 cups |
| 4 fl oz | 0.5 cups |
| 6 fl oz | 0.75 cups |
| 8 fl oz | 1 cup |
| 12 fl oz | 1.5 cups |
| 16 fl oz | 2 cups |
| 24 fl oz | 3 cups |
| 32 fl oz | 4 cups |
The Fluid Ounces to Cups Formula
To convert fluid ounces to cups, divide the fluid ounce value by 8. For example, 20 fl oz divided by 8 equals 2.5 cups.
To go the other way, use the Cups to Fluid Ounces converter below instead, which multiplies by 8 for you. For example, 2.5 cups times 8 equals 20 fl oz.
How Many Ounces Are in a Cup, Exactly?
A US cup holds exactly 8 fluid ounces, a ratio fixed by the legal definitions of both units rather than a rounded approximation. This is specifically the US customary cup and US fluid ounce, the units used on US recipes and packaging.
A Note on "Legal Cups" and Nutrition Labeling
For food-label purposes, the FDA defines a "cup" for nutrition-facts rounding as 240 mL and a fluid ounce as 30 mL, both slightly rounder than the exact customary values (236.588 mL and 29.5735 mL respectively). The 8:1 ratio between cups and fluid ounces holds either way; only the milliliter equivalents differ slightly, and the Milliliters to Fluid Ounces converter below uses the exact customary value.
A fluid ounce measures volume and a pound measures weight, so the Fluid Ounces to Pounds Converter uses the ingredient's density to connect the two. Baking recipes often give flour or sugar by weight, and the Cups to Grams Converter turns a cup measure into grams for common baking ingredients. When comparing bottle or carton sizes at the store, the Price Per Ounce Calculator works out the price per ounce of two options and shows the better value.
Frequently Asked Questions
How many cups is 10 fluid ounces?
1.25 cups.
How many cups is 40 fluid ounces?
5 cups.
How many cups is 14 fluid ounces?
1.75 cups.
How many cups is 18 fluid ounces?
2.25 cups.
Is 1 oz the same as 1/8 cup?
Yes, for fluid ounces. 1 fl oz equals exactly 0.125 cup (1 divided by 8).
Can an oz-to-cups result be negative?
No. A volume can't be below zero, so a negative entry shows a dash instead of a result. A minus sign in front of a value is usually a typing slip.
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