---
title: "US fluid ounces to US cups — fl oz to cup converter"
description: "1 US fluid ounce = 0.125 US cups. Convert US fluid ounces to US cups with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/fl-oz-to-cups/
site: "At One Place"
---

# US fluid ounces to US cups

**1 US fluid ounce in US cups: 1 fl oz = 0.125 cup**

cup = fl oz × 1/8

To convert US fluid ounces to US cups, multiply by 0.125. The table below gives the values people look up most often, and the converter works for any number.

## US fluid ounces to US cups table

*Common US fluid ounce values converted to US cups.*

| US fluid ounces | US cups |
| --- | --- |
| 1 fl oz | 0.125 |
| 2 fl oz | 0.25 |
| 3 fl oz | 0.375 |
| 4 fl oz | 0.5 |
| 5 fl oz | 0.625 |
| 10 fl oz | 1.25 |
| 15 fl oz | 1.875 |
| 20 fl oz | 2.5 |
| 25 fl oz | 3.125 |
| 30 fl oz | 3.75 |
| 40 fl oz | 5 |
| 50 fl oz | 6.25 |
| 75 fl oz | 9.375 |
| 100 fl oz | 12.5 |
| 250 fl oz | 31.25 |
| 500 fl oz | 62.5 |
| 1,000 fl oz | 125 |

## How the conversion works

The relationship is cup = fl oz × 1/8. Both units measure volume, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two.

> US cup: US legal cup is 240 mL; the customary cup used here is 236.588 mL.

## Common questions

### How many US cups are in one US fluid ounce?

One US fluid ounce equals 0.125 US cups. cup = fl oz × 1/8.

### How do you convert US fluid ounces to US cups?

Use cup = fl oz × 1/8. So 10 fl oz is 1.25 cup.

### How many US fluid ounces are in one US cup?

One US cup equals 8 US fluid ounces, which is the reverse of the conversion above.

### Is there more than one kind of US cup?

US legal cup is 240 mL; the customary cup used here is 236.588 mL.

## Related pages

- [US cups to US fluid ounces](https://atoneplace.net/convert/cups-to-fl-oz/)
- [US fluid ounces to Liters](https://atoneplace.net/convert/fl-oz-to-liters/)
- [US fluid ounces to Milliliters](https://atoneplace.net/convert/fl-oz-to-ml/)
- [US fluid ounces to Cubic meters](https://atoneplace.net/convert/fl-oz-to-cubic-meters/)
- [US fluid ounces to US gallons](https://atoneplace.net/convert/fl-oz-to-gallons/)
- [US fluid ounces to US quarts](https://atoneplace.net/convert/fl-oz-to-quarts/)
- [US fluid ounces to US pints](https://atoneplace.net/convert/fl-oz-to-pints/)
- [US fluid ounces to Tablespoons](https://atoneplace.net/convert/fl-oz-to-tablespoons/)
- [US fluid ounces to Teaspoons](https://atoneplace.net/convert/fl-oz-to-teaspoons/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)