Convert Water: cups to oz
1 cup of Water = 8.35 oz
Amount of Water
Density: 1 g/ml · Water
Water: cups to oz at a glance
The amounts people ask for most, worked out for Water.
How much Water weighs
Every figure below is one measured number — 236.6 g per US cup — scaled. That is why this table and the converter above it cannot disagree.
One cup, side by side
Why is water on an ingredient converter at all?
Because it is the reference every other ingredient here is measured against, and because it is the one case where the numbers are definitions rather than measurements: one US cup is exactly 236.588 ml, and water is 1 g per ml, so a cup of water weighs 236.588 g. It is also the assumption a generic converter makes about everything else — which is how you end up being told a cup of all-purpose flour is 237 g when it is 120 g.
Source for Water: Definition: 1 US cup = 236.588 ml at 1 g/ml
Frequently asked questions
How many oz is 1 cup of Water?
1 cup of Water is 8.35 oz, because one US cup of Water weighs 236.6 g. That single measured figure is the whole conversion — every other unit on this page is derived from it.
How many cups is 4 oz of Water?
4 oz of Water is 0.479 cups. It is the same conversion read backwards, so this page and its reverse always agree.
Is that ounces by weight, or fluid ounces?
By weight. dishscale's ounce is the international avoirdupois ounce, 28.3495 g, so one cup of Water is 8.35 oz. A US fluid ounce is a volume and there are eight of them to the cup, so that same cup is 8 fl oz at the same time. The two readings coincide only for an ingredient that happens to weigh eight ounces to the cup.
Where does dishscale's figure for Water come from?
One US cup of Water is 236.6 g. The dataset records that as: “Definition: 1 US cup = 236.588 ml at 1 g/ml”. Every ingredient on the site carries the reference its weight came from, so any number here can be checked — and corrected if the source disagrees.