--- title: "1 cup to fl oz = 8 fl oz" description: "1 US cup is 8 US fluid ounces. The arithmetic, a table of nearby values, and a converter for any other number." url: https://atoneplace.net/convert/1-cups-to-fl-oz/ site: "At One Place" --- # 1 cup to fl oz **1 US cup in US fluid ounces: 1 cup = 8 fl oz** fl oz = cup × 8 1 US cup is 8 US fluid ounces. To get there, multiply by 8. ## Values either side *US cups near 1, converted to US fluid ounces.* | US cups | US fluid ounces | | --- | --- | | 0.5 cup | 4 | | 1 cup ← | 8 | | 1.5 cup | 12 | | 2 cup | 16 | | 2.5 cup | 20 | | 3 cup | 24 | ## How the conversion works The relationship is fl oz = cup × 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 1 cup in US fluid ounces? 1 cup is 8 fl oz. ### How do you convert US cups to US fluid ounces? Multiply by 8. ## Related pages - [US cups to US fluid ounces](https://atoneplace.net/convert/cups-to-fl-oz/) - [1 fl oz to cup](https://atoneplace.net/convert/1-fl-oz-to-cups/) - [0.5 cup to fl oz](https://atoneplace.net/convert/0-5-cups-to-fl-oz/) - [1.5 cup to fl oz](https://atoneplace.net/convert/1-5-cups-to-fl-oz/) - [2 cup to fl oz](https://atoneplace.net/convert/2-cups-to-fl-oz/) - [2.5 cup to fl oz](https://atoneplace.net/convert/2-5-cups-to-fl-oz/) - [3 cup to fl oz](https://atoneplace.net/convert/3-cups-to-fl-oz/) ## 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/)