---
title: "45 fl oz to cup = 5.625 cup"
description: "45 US fluid ounces is 5.625 US cups. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/45-fl-oz-to-cups/
site: "At One Place"
---

# 45 fl oz to cup

**45 US fluid ounces in US cups: 45 fl oz = 5.625 cup**

cup = fl oz × 1/8

45 US fluid ounces is 5.625 US cups. To get there, multiply by 0.125.

## Values either side

*US fluid ounces near 45, converted to US cups.*

| US fluid ounces | US cups |
| --- | --- |
| 35 fl oz | 4.375 |
| 36 fl oz | 4.5 |
| 37 fl oz | 4.625 |
| 40 fl oz | 5 |
| 45 fl oz ← | 5.625 |
| 50 fl oz | 6.25 |
| 55 fl oz | 6.875 |
| 60 fl oz | 7.5 |
| 65 fl oz | 8.125 |

## 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

### What is 45 fl oz in US cups?

45 fl oz is 5.625 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/)
- [45 cup to fl oz](https://atoneplace.net/convert/45-cups-to-fl-oz/)
- [35 fl oz to cup](https://atoneplace.net/convert/35-fl-oz-to-cups/)
- [36 fl oz to cup](https://atoneplace.net/convert/36-fl-oz-to-cups/)
- [37 fl oz to cup](https://atoneplace.net/convert/37-fl-oz-to-cups/)
- [40 fl oz to cup](https://atoneplace.net/convert/40-fl-oz-to-cups/)
- [50 fl oz to cup](https://atoneplace.net/convert/50-fl-oz-to-cups/)
- [55 fl oz to cup](https://atoneplace.net/convert/55-fl-oz-to-cups/)
- [60 fl oz to cup](https://atoneplace.net/convert/60-fl-oz-to-cups/)
- [65 fl oz to cup](https://atoneplace.net/convert/65-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/)