Cups to Ounces Converter (Fluid Ounces)

Where do these numbers come from?

Checked Oct 23, 2026. 1 US cup is exactly 236.5882365 mL (NIST SP 811), so 250 mL = 1.057 cups.

How we calculate Corrections Changelog About CupRuler

Shaped dough resting under a dusting of flour — Weigh once, bake the same loaf every time. Photos: Tijana Drinic, Diego Arenas de Rodrigo, Vicky Ng / Unsplash.

Two loaves proofing in floured cane baskets — Weigh once, bake the same loaf every time. Photos: Tijana Drinic, Diego Arenas de Rodrigo, Vicky Ng / Unsplash.

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Fluid ounces are volume

Fluid ounces measure volume; ounces (oz) on a scale measure weight. They only match for water-like liquids. For flour or sugar, use the grams to cups converter.

Cups	Fluid ounces	mL
0.25	2	59.1
0.3333333333333333	2.67	78.9
0.5	4	118.3
0.6666666666666666	5.33	157.7
0.75	6	177.4
1	8	236.6
1.5	12	354.9
2	16	473.2
3	24	709.8
4	32	946.4

Fluid ounces vs weight ounces

One US cup is 8 US fluid ounces of volume. Weight is different: a cup of water weighs about 8.3 oz, but a cup of all-purpose flour weighs about 4.25 oz (120 g) and a cup of granulated sugar about 7.1 oz (200 g). If a recipe lists ounces for a dry ingredient, it almost always means weight.

UK and US fluid ounces

A US fluid ounce is 29.57 mL and a UK fluid ounce is 28.41 mL, and a UK pint is 20 UK fluid ounces versus 16 US fluid ounces, so pints differ more than ounces.

Frequently asked questions

How many ounces in a cup?

8 US fluid ounces.

How many ounces are in a cup?

8 fluid ounces in a US cup.

How many ounces of flour are in a cup?

About 4.25 ounces (120 g) for spooned and levelled all-purpose flour.