Ounces to Cups Converter

How many ounces in a cup?

There are 8 fluid ounces in one cup. This is a standard US measurement used in cooking and baking. Knowing this conversion helps you follow recipes accurately.

Converting ounces to cups

To convert fluid ounces to cups, divide by 8:

$$\text{Cups} = \frac{\text{Fluid ounces}}{8}$$

To convert cups to fluid ounces, multiply by 8:

$$\text{Fluid ounces} = \text{Cups} \times 8$$

Quick examples

• 4 fl oz = ½ cup
• 8 fl oz = 1 cup
• 12 fl oz = 1½ cups
• 16 fl oz = 2 cups
• 32 fl oz = 4 cups (1 quart)

Common conversions table

Fluid ounces	Cups	Tablespoons
1 fl oz	⅛ cup	2 tbsp
2 fl oz	¼ cup	4 tbsp
4 fl oz	½ cup	8 tbsp
6 fl oz	¾ cup	12 tbsp
8 fl oz	1 cup	16 tbsp
12 fl oz	1½ cups	24 tbsp
16 fl oz	2 cups	32 tbsp

Fluid ounces vs weight ounces

This can be confusing. There are two types of ounces:

Fluid ounces (fl oz) measure volume — how much space a liquid takes up. Eight fluid ounces of water and eight fluid ounces of honey both fill the same cup.

Weight ounces (oz) measure mass — how heavy something is. Eight ounces of feathers weighs the same as eight ounces of lead, but they take up very different amounts of space.

For liquids in recipes, you almost always use fluid ounces. The weight of that liquid depends on what it is.

Common beverage sizes

Understanding ounces helps when buying drinks:

Drink size	Fluid ounces	Cups
Shot glass	1.5 fl oz	3 tbsp
Small coffee	8 fl oz	1 cup
Can of soda	12 fl oz	1½ cups
Water bottle	16.9 fl oz	2 cups
Large coffee	20 fl oz	2½ cups
Big Gulp	32 fl oz	4 cups

Using measuring cups correctly

For accurate liquid measurements:

1. Use a liquid measuring cup — It has a spout and room at the top
2. Set it on a flat surface — Do not hold it in your hand
3. Read at eye level — Bend down to see the measurement
4. Look at the bottom of the curve — Liquid curves up at the edges

Metric conversions

If you are using a recipe from another country, you might need metric conversions:

US measurement	Metric equivalent
1 fl oz	29.6 mL
1 cup (8 fl oz)	237 mL
1 pint (16 fl oz)	473 mL
1 quart (32 fl oz)	946 mL

Tablespoons and teaspoons

For smaller amounts, you might use tablespoons or teaspoons:

• 1 cup = 16 tablespoons
• 1 tablespoon = 3 teaspoons
• 1 fluid ounce = 2 tablespoons

So if a recipe calls for 3 fluid ounces, that equals 6 tablespoons.

Tips for measuring liquids

• Do not use dry measuring cups for liquids — They are meant to be filled to the brim, which causes spills with liquids
• Add liquids at eye level — Pouring from above makes it hard to see the measurement
• Use the right size cup — Measuring ¼ cup in a 4-cup measure is less accurate

Frequently asked questions

Is 8 oz always equal to 1 cup?

For volume (fluid ounces), yes. Eight fluid ounces always equals one cup. But eight ounces by weight varies depending on the ingredient. For example, 8 oz of flour by weight is about 1¾ cups.

How many ounces are in a half cup?

There are 4 fluid ounces in half a cup. Divide 8 by 2 to get 4.

How do I measure 6 oz without a measuring cup?

Six fluid ounces equals 12 tablespoons or ¾ cup. You can also fill a standard 8 oz cup three-quarters full.

Are UK fluid ounces the same as US fluid ounces?

No. UK (Imperial) fluid ounces are slightly smaller. One US cup equals 8 US fluid ounces, but about 8.3 UK fluid ounces. For most recipes, this difference is small enough to ignore.