---
title: "100 fl oz to cup = 12.5 cup"
description: "100 US fluid ounces is 12.5 US cups. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/100-fl-oz-to-cups/
site: "At One Place"
---

# 100 fl oz to cup

**100 US fluid ounces in US cups: 100 fl oz = 12.5 cup**

cup = fl oz × 1/8

100 US fluid ounces is 12.5 US cups. To get there, multiply by 0.125.

## Values either side

*US fluid ounces near 100, converted to US cups.*

| US fluid ounces | US cups |
| --- | --- |
| 80 fl oz | 10 |
| 85 fl oz | 10.625 |
| 90 fl oz | 11.25 |
| 95 fl oz | 11.875 |
| 100 fl oz ← | 12.5 |
| 110 fl oz | 13.75 |
| 120 fl oz | 15 |
| 125 fl oz | 15.625 |
| 150 fl oz | 18.75 |

## 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

### What is 100 fl oz in US cups?

100 fl oz is 12.5 cup.

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

Multiply by 0.125.

## Related pages

- [US fluid ounces to US cups](https://atoneplace.net/convert/fl-oz-to-cups/)
- [100 cup to fl oz](https://atoneplace.net/convert/100-cups-to-fl-oz/)
- [80 fl oz to cup](https://atoneplace.net/convert/80-fl-oz-to-cups/)
- [85 fl oz to cup](https://atoneplace.net/convert/85-fl-oz-to-cups/)
- [90 fl oz to cup](https://atoneplace.net/convert/90-fl-oz-to-cups/)
- [95 fl oz to cup](https://atoneplace.net/convert/95-fl-oz-to-cups/)
- [110 fl oz to cup](https://atoneplace.net/convert/110-fl-oz-to-cups/)
- [120 fl oz to cup](https://atoneplace.net/convert/120-fl-oz-to-cups/)
- [125 fl oz to cup](https://atoneplace.net/convert/125-fl-oz-to-cups/)
- [150 fl oz to cup](https://atoneplace.net/convert/150-fl-oz-to-cups/)

## 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/)