Ounces to Cups Converter
Convert ounces to cups for liquids and dry ingredients. Whether you've got fluid ounces of milk or weight ounces of flour, this tool handles both — because they work differently and it's worth understanding why.
Quick reference: All-purpose flour
125g
= 1 cup
7.81g
= 1 tbsp
2.6g
= 1 tsp
4.41oz
= 1 cup
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Try MealMatics FreeFluid Ounces vs. Weight Ounces: The Difference That Trips Everyone Up
We built this page because the word 'ounce' ruins more recipes than burnt butter. Fluid ounces measure volume — how much space something fills. Weight ounces measure mass — how heavy it is. For water they nearly overlap, which tricks people into assuming they are interchangeable.
The USDA's measurement standards document the gap clearly: 1 fluid ounce of honey weighs over 1.5 weight ounces because honey is far denser than water. '4 ounces of cream' almost always means fluid ounces — pour to the line. '4 ounces of flour' means weight — put the bag on a scale.
The liquid math is dead simple: divide fluid ounces by 8 and you get cups. Four fluid ounces equal half a cup, 16 equal 2 cups, 32 equal 4 cups — one quart. For weight ounces of dry ingredients, though, density changes everything. Eight weight ounces of water fills exactly 1 cup, but 8 weight ounces of all-purpose flour fills about 1.8 cups because flour packs so much lighter per unit volume. King Arthur Baking's ingredient weight chart confirms the spread: a cup of all-purpose flour weighs only 120 grams (about 4.2 oz) while a cup of granulated sugar weighs 198 grams (about 7 oz), both measured with the scoop-and-level method. That gap means you cannot convert dry ounces to cups without knowing which ingredient you are working with — and that is exactly the mistake this converter is designed to prevent.
Ounces to Cups — Quick Reference Chart
| Fluid Ounces | Cups | Fraction | mL |
|---|---|---|---|
| 1 fl oz | ⅛ cup | 0.125 cup | 29.6 ml |
| 2 fl oz | ¼ cup | 0.25 cup | 59.1 ml |
| 4 fl oz | ½ cup | 0.5 cup | 118.3 ml |
| 6 fl oz | ¾ cup | 0.75 cup | 177.4 ml |
| 8 fl oz | 1 cup | 1 cup | 236.6 ml |
| 12 fl oz | 1½ cups | 1.5 cups | 354.9 ml |
| 16 fl oz | 2 cups | 2 cups | 473.2 ml |
| 24 fl oz | 3 cups | 3 cups | 709.8 ml |
| 32 fl oz | 4 cups | 4 cups | 946.4 ml |
| 64 fl oz | 8 cups | 8 cups | 1892.7 ml |
Frequently Asked Questions
How many ounces are in 1 cup?
1 US cup equals exactly 8 fluid ounces. This is a fixed conversion that never changes for liquids. For dry ingredients measured by weight, it depends on the ingredient — 1 cup of flour is about 4.4 oz, while 1 cup of sugar is about 7.1 oz.
What's the difference between fluid ounces and weight ounces?
Fluid ounces (fl oz) measure volume — how much space a liquid takes up. Weight ounces measure mass — how heavy something is. For water, they're nearly the same (1 fl oz ≈ 1 oz by weight), but for most other ingredients they differ significantly.
My recipe says "8 oz of flour" — is that weight or volume?
Almost certainly weight (mass) ounces, since flour is typically measured by weight in serious recipes. 8 oz of flour by weight is about 1¾ cups. If it said "8 fl oz of flour," that would be 1 cup — but that phrasing is unusual for dry ingredients.
How do I convert fluid ounces to cups?
Divide fluid ounces by 8. So 4 fl oz = ½ cup, 8 fl oz = 1 cup, 16 fl oz = 2 cups. This works for any liquid.
Does this converter work for milk, juice, and other liquids?
Yes. All thin liquids (water, milk, juice, broth, most oils) convert at the standard rate of 8 fl oz per cup. Thick liquids like honey, molasses, and syrups are denser, so their weight ounces will differ from fluid ounces.
What is a US cup in ounces versus a UK cup?
A US cup is 8 fl oz (236.6 ml). The UK and most Commonwealth countries use either a metric cup (250 ml ≈ 8.45 fl oz) or the imperial cup (284 ml ≈ 10 fl oz). This converter uses the US cup standard.