---
title: "US fluid ounces to Imperial fluid ounces converter"
description: "1 US fluid ounce = 1.040843 imperial fluid ounces. Conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/fl-oz-to-imperial-fl-oz/
site: "At One Place"
---

# US fluid ounces to imperial fluid ounces

**1 US fluid ounce in imperial fluid ounces: 1 fl oz = 1.040843 imp fl oz**

imp fl oz = fl oz × 1.040842731

To convert US fluid ounces to imperial fluid ounces, multiply by 1.040842731. The table below gives the values people look up most often, and the converter works for any number.

## US fluid ounces to imperial fluid ounces table

*Common US fluid ounce values converted to imperial fluid ounces.*

| US fluid ounces | Imperial fluid ounces |
| --- | --- |
| 1 fl oz | 1.040843 |
| 2 fl oz | 2.081685 |
| 3 fl oz | 3.122528 |
| 4 fl oz | 4.163371 |
| 5 fl oz | 5.204214 |
| 10 fl oz | 10.40843 |
| 15 fl oz | 15.61264 |
| 20 fl oz | 20.81685 |
| 25 fl oz | 26.02107 |
| 30 fl oz | 31.22528 |
| 40 fl oz | 41.63371 |
| 50 fl oz | 52.04214 |
| 75 fl oz | 78.0632 |
| 100 fl oz | 104.0843 |
| 250 fl oz | 260.2107 |
| 500 fl oz | 520.4214 |
| 1,000 fl oz | 1,040.8427 |

## How the conversion works

The relationship is imp fl oz = fl oz × 1.040842731. Both units measure volume, so the conversion is a fixed factor that never changes.

## Common questions

### How many imperial fluid ounces are in one US fluid ounce?

One US fluid ounce equals 1.040843 imperial fluid ounces. imp fl oz = fl oz × 1.040842731.

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

Use imp fl oz = fl oz × 1.040842731. So 10 fl oz is 10.40843 imp fl oz.

### How many US fluid ounces are in one imperial fluid ounce?

One imperial fluid ounce equals 0.96076 US fluid ounces, which is the reverse of the conversion above.

## Related pages

- [Imperial fluid ounces to US fluid ounces](https://atoneplace.net/convert/imperial-fl-oz-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 US cups](https://atoneplace.net/convert/fl-oz-to-cups/)
- [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/)