# Ounces to Cups Converter URL: https://speedycalculator.com/calculators/conversion/ounces-to-cups/ Last updated: 2026-10-25 > Convert US fluid ounces (US fl oz) to US cups (US cup): 1 US fluid ounce = 0.125 US cup, so multiply by 0.125 or divide by 8. Both fields are editable, so you can also type in US cups and get US fluid ounces back. ## Inputs - US fluid ounces (US fl oz) ## Results - US cups ## Formula ``` 1 US fl oz = 0.125 US cup 1 US cup = 8 US fl oz US cup = US fl oz × 0.125 ``` ## Explanation A U.S. cup holds 8 fluid ounces. This converter is for volume; for dry ingredients measured by weight in ounces, use a weight-to-volume converter with the ingredient’s density. ### How to use the Ounces to Cups Converter - Type the number of US fluid ounces into the **US fluid ounces** field. Decimals such as 4 are fine. - Read the answer in **US cups** – it updates as you type, with no button to press. - To convert the other way, type into **US cups** and the US fluid ounces are recalculated. - Press **Copy results** to copy both values with the page title, or **Copy link** to share this exact conversion. This page converts only US fl oz ⇄ US cup. Need a different unit? Use the general volume converter, where you can choose any “from” and “to” unit. ### How it works Both units measure volume, so they are always in the same ratio: one US fluid ounce equals 0.125 US cups. The calculator multiplies the number of US fluid ounces you type by 0.125 to give US cups, and when you type into the US cups field it divides by the same factor to give US fluid ounces. Because the ratio never changes, doubling the US fluid ounces always doubles the US cups. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation). ### How to convert US fluid ounces to US cups - Write down the value in US fluid ounces, for example **8 US fl oz**. - Multiply by the conversion factor 0.125 (because 1 US fluid ounce = 0.125 US cup). - 8 × 0.125 = **1 US cup**. - To go back from US cups to US fluid ounces, divide by 0.125 – or multiply by 8. ### US fl oz to US cup conversion table US fluid ouncesUS cupsUS cupsUS fluid ounces1 US fl oz0.125 US cup1 US cup8 US fl oz2 US fl oz0.25 US cup2 US cup16 US fl oz4 US fl oz0.5 US cup5 US cup40 US fl oz6 US fl oz0.75 US cup10 US cup80 US fl oz8 US fl oz1 US cup20 US cup160 US fl oz10 US fl oz1.25 US cup50 US cup400 US fl oz12 US fl oz1.5 US cup100 US cup800 US fl oz16 US fl oz2 US cup1,000 US cup8,000 US fl oz20 US fl oz2.5 US cup24 US fl oz3 US cup32 US fl oz4 US cup64 US fl oz8 US cup ### What is a US fluid ounce? The U.S. fluid ounce is 1/128 of a U.S. gallon, about 29.57 mL. It is a unit of volume: a fluid ounce of water weighs about one ounce, but other liquids do not. ### What is a US cup? The U.S. customary cup is 8 U.S. fluid ounces, about 236.6 mL. Recipes from Australia, Canada and New Zealand often use the 250 mL metric cup instead. ### Quick mental conversion For a fast estimate, multiply US fluid ounces by about **0.12** to get US cups; the error is about 4.0%. Use the calculator above when you need the exact figure. ### Common mistakes to avoid Mixing u.s. and uk gallons, pints and fluid ounces, assuming a cup is always 250 ml, and treating volume and weight as interchangeable for anything except water. ## Worked example Inputs — US fluid ounces: 8 US fl oz. Results — **US cups = 1 US cup**. ## FAQ **How many cups is 16 fl oz?** 2 cups. **Is a coffee cup 8 oz?** A standard U.S. measuring cup is 8 fl oz; mugs often hold 10–12 oz. **How many US cups are in one US fluid ounce?** 1 US fl oz = 0.125 US cup. **How many US fluid ounces are in one US cup?** 1 US cup = 8 US fl oz. **How do I convert US fluid ounces to US cups?** Multiply the number of US fluid ounces by 0.125. For example, 8 US fl oz × 0.125 = 1 US cup. **How do I convert US cups back to US fluid ounces?** Divide by 0.125 (or multiply by 8), or simply type the value into the US cups field above. **What is 10 US fl oz in US cups?** 10 US fl oz = 1.25 US cup. **What is 2 US fl oz in US cups?** 2 US fl oz = 0.25 US cup. **Is this conversion exact?** Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit. **Can I convert to other units on this page?** This page converts only between US fluid ounces and US cups. To pick any volume unit, use the general volume converter linked under Related calculators. **What formula does the Ounces to Cups Converter use?** 1 US fl oz = 0.125 US cup. ## Sources - [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811) - [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)