Unit converter
Fluid ounces (US) to Cups (US)
Instant conversion in your browser — volume.
Tip: enter the values one by one — 40 30 55 20 — and you get the total and the average.
1 fl oz = 0.125 cup
Quick table Fluid ounces (US) → Cups (US)
| fl oz | cup |
|---|---|
| 1 | 0.125 |
| 5 | 0.625 |
| 10 | 1.25 |
| 25 | 3.125 |
| 50 | 6.25 |
| 100 | 12.5 |
| 500 | 62.5 |
| 1,000 | 125 |
All unit families
- Lengthmm · cm · m · km · in · ft · yd · miAlmost the whole world measures length in metres. The exceptions are narrow but stubborn: the United States uses feet and inches for everyday distances, and the United Kingdom still posts road signs in miles while selling timber in millimetres.
- Weight / Massmg · g · kg · t · oz · lb · stThe kilogram is the base unit, and until 2019 it was the last one still defined by a physical object: a platinum-iridium cylinder kept near Paris. It is now defined through the Planck constant, so it can be reproduced in any properly equipped laboratory.
- Temperature°C · °F · KTemperature is the one family here that is not a multiplication. Celsius and Fahrenheit have different zero points as well as different step sizes, so you need the formula: °F = °C × 9/5 + 32.
- Aream² · km² · ha · ft² · acAreas are where a linear conversion quietly goes wrong. One metre is 3.28 feet, but one square metre is 10.76 square feet — the factor is squared. Converting the sides and forgetting the square is the single most common mistake in this family.
- Speedkm/h · mph · m/s · knFour units, four different worlds. Kilometres per hour on European roads, miles per hour in the US and UK, metres per second in physics and weather bulletins, knots at sea and in the air.
- Times · min · h · d · wk · mo · yrSeconds, minutes, hours, days and weeks convert exactly. Months and years do not, and no converter can make them.
- Digital storagebit · B · KB · MB · GB · TBDigital storage has two conflicting definitions of the same prefixes, and almost every confusion about file sizes comes from that.
About this conversion
A US cup is exactly 8 US fluid ounces, so the conversion is a division by eight and the awkward numbers are the ones worth having written down: 12 fl oz is a cup and a half, 20 is two and a half, 6 is three quarters. ⚠️ These are US measures. The imperial fluid ounce is 28.41 ml against the US 29.57, and a British recipe cup is not a US cup — for anything where the difference matters, check which side of the Atlantic the recipe came from before scaling it up.
| Fluid ounces (US) | Cups (US) | Millilitres |
|---|---|---|
| 2 fl oz | 0.25 | 59 ml |
| 3 fl oz | 0.38 | 89 ml |
| 4 fl oz | 0.5 | 118 ml |
| 6 fl oz | 0.75 | 177 ml |
| 7 fl oz | 0.88 | 207 ml |
| 8 fl oz | 1 | 237 ml |
| 12 fl oz | 1.5 | 355 ml |
| 15 fl oz | 1.88 | 444 ml |
| 16 fl oz | 2 | 473 ml |
| 17 fl oz | 2.13 | 503 ml |
| 20 fl oz | 2.5 | 591 ml |
| 23 fl oz | 2.88 | 680 ml |
| 24 fl oz | 3 | 710 ml |
| 32 fl oz | 4 | 946 ml |
| 64 fl oz | 8 | 1893 ml |
| 125 fl oz | 15.63 | 3697 ml |
Frequently asked questions
How do you convert fluid ounces (us) to cups (us)?
To go from fl oz to cup: multiply by 0.125 (1 fl oz = 0.125 cup). Example: 3 fl oz = 0.375 cup. The converter above runs the math live as you type.
How much is 10 fluid ounces (us) in cups (us)?
10 fl oz equals 1.25 cup. For other values, use the quick table or type your own number into the converter.
What are fluid ounces (fl oz)?
The US fluid ounce is 29.57 ml, one sixteenth of a pint. Cocktail recipes, soda cans (12 fl oz) and cosmetics use it — despite the name, it measures volume, not weight.
What are US cups?
The US cup is 236.6 ml, the backbone of American recipes: 1 cup of flour, half a cup of sugar. Metric cooks convert it constantly — 1 cup is roughly 240 ml or 16 tablespoons.