Ounces to Cups Converter

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

1. Type the number of US fluid ounces into the US fluid ounces field. Decimals such as 4 are fine.
2. Read the answer in US cups – it updates as you type, with no button to press.
3. To convert the other way, type into US cups and the US fluid ounces are recalculated.
4. 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

1. Write down the value in US fluid ounces, for example 8 US fl oz.
2. Multiply by the conversion factor 0.125 (because 1 US fluid ounce = 0.125 US cup).
3. 8 × 0.125 = 1 US cup.
4. 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

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.