Cups to fluid ounces converter
Convertersconversion pair
Convert cups to fluid ounces instantly: 1 cup is 8 fl oz. Recipes, drinks and kitchen math, with the exact measure and a copy button.
8 fluid ounces in a cup — the kitchen's most reliable symmetry.
work surface
Math, not advice — results are indicative. Read the disclaimer.
pro tips
Quick mental math: multiply by 8. 2 cups becomes 16 fl oz — also known as a pint, which is also true.
1/2 cup = 4 fl oz, the half-measure of every coffee and every recipe.
1 cup of coffee is 8 fl oz — the only cup that keeps its word.
what it does
The cups-to-fluid-ounces trick is the number every US kitchen knows by instinct: one cup holds exactly 8 fluid ounces. Multiply by 8 and the ounces appear — the measuring cup has been doing this math for decades and still won't split the egg.
It shows up right where the cup earns its keep: a recipe asking for milk "in cups" while the carton brags in fluid ounces (2 cups is 16, a pint, which is also true), a coffee order described as "8 oz" when the mug is clearly a cup, or a baking recipe with 1.5 cups of broth needing 12 fluid ounces and a shared sense of purpose.
The beautiful fractions: half a cup is 4 fl oz, a third is about 2.7, and a quarter cup is 2. Smooth halfway there. The exact widget handles the thirds for when the recipe really commits.
Type any cup count and the widget answers in fluid ounces on the spot, with the math in the hint. Click the result to copy it, and hit swap when the measuring jug flips — the fluid-ounces-to-cups version is one click from converting it right back.
quick answers
How many fluid ounces are in a cup?
8 fluid ounces in the US version, which is why "a cup" and "8 oz" are the same sentence in the kitchen.
Is a cup of flour 8 fluid ounces?
Volume-wise the cup is 8 fl oz, but flour weighs less than water, so it's a different story on a scale. That's why good bakers weigh.
Why do recipes say cup instead of 8 oz?
Tradition and measuring cups. Saying "a cup" is friendlier than "8 fluid ounces", even to people who know the truth.
Is a UK cup the same?
No — the UK imperial cup is about 9.6 fluid ounces. This page uses the US cup of 8 fl oz, the one in the American recipes.