Convert fluid ounces to cups
1 fl oz (US) = 0.125 cup (US) · 1 cup (US) = 8 fl oz (US) · Exact by definition
1 fl oz (US) = 0.125 cup (US)
The same value in other units
- millilitre
- 29.5735 ml
- litre
- 0.0295735 l
- cubic metre
- 2.95735e-5 m³
- US gallon
- 0.0078125 gal (US)
- imperial gallon
- 0.00650527 gal (UK)
Settings
Digits kept in the answer. Automatic keeps six, which hides floating-point noise without losing anything real.
Convert a whole list
Paste one conversion per line, written the way you would say it: "5 km to mi". Handy for a column copied out of a spreadsheet.
Volume
fluid ounces to cups: conversion table
| US fluid ounce | US cup |
|---|---|
| 1 fl oz (US) | 0.125 cup (US) |
| 2 fl oz (US) | 0.25 cup (US) |
| 3 fl oz (US) | 0.375 cup (US) |
| 5 fl oz (US) | 0.625 cup (US) |
| 10 fl oz (US) | 1.25 cup (US) |
| 20 fl oz (US) | 2.5 cup (US) |
| 25 fl oz (US) | 3.125 cup (US) |
| 50 fl oz (US) | 6.25 cup (US) |
| 100 fl oz (US) | 12.5 cup (US) |
| 250 fl oz (US) | 31.25 cup (US) |
| 500 fl oz (US) | 62.5 cup (US) |
| 1000 fl oz (US) | 125 cup (US) |
| US cup | US fluid ounce |
|---|---|
| 1 cup (US) | 8 fl oz (US) |
| 2 cup (US) | 16 fl oz (US) |
| 3 cup (US) | 24 fl oz (US) |
| 5 cup (US) | 40 fl oz (US) |
| 10 cup (US) | 80 fl oz (US) |
| 20 cup (US) | 160 fl oz (US) |
| 25 cup (US) | 200 fl oz (US) |
| 50 cup (US) | 400 fl oz (US) |
| 100 cup (US) | 800 fl oz (US) |
| 250 cup (US) | 2000 fl oz (US) |
| 500 cup (US) | 4000 fl oz (US) |
| 1000 cup (US) | 8000 fl oz (US) |
How the conversion works
cup (US) = fl oz (US) × 0.125
Both units are defined exactly, so the precision of the fluid ounces to cups result depends only on the number of decimal places you choose.
METHOD AND SOURCES
Where the conversion factors come from
Results are calculated from the unit definitions stored in the converter, not copied from a lookup table. For exact units, every value in the table follows from the same factor shown in the formula above.
- BIPM — SI Brochure
The official definitions of the International System of Units (SI).
- NIST SP 811 — Conversion factors
Conversion-factor tables for SI and non-SI units.
Keep going