Ounces to Grams: Water Converter

Convert water between ounces and grams using its measured density of about 237 g per cup. The widget below is pre-set to this exact conversion and recalculates as you type.

Converted amount

28.35g

1 oz of water = 28.35 g

Exact weight

28.3 g

Ounces

1 oz

Milliliters

28 ml

Kitchen measure

1 tbsp + 2 3/4 tsp

1 cup of water weighs about 237 g. Densities are averages — sifted flour is lighter, packed sugar is heavier. Fractions such as 1 1/2 or 3/4 are supported.

Water conversion chart

Ounces to Grams, rounded for the kitchen.

OuncesGramsGrams
1 oz28.3 g28.35 g
2 oz56.7 g56.7 g
3 oz85 g85.05 g
4 oz113.4 g113.4 g
6 oz170.1 g170.1 g
8 oz226.8 g226.8 g
12 oz340.2 g340.19 g
16 oz453.6 g453.59 g

How to convert ounces to grams for water

Ingredient conversion is a two-step calculation. First, ounces are turned into grams using water's density of about 237 g per cup, or its exact weight factor for ounces. Then those grams are expressed in grams. Because every conversion passes through weight, the result is consistent whether you start from cups, tablespoons, milliliters, or ounces.

Density is the reason a universal "cups to grams" number does not exist. A cup of sifted all-purpose flour is about 120 g, while a cup of granulated sugar is about 200 g and a cup of honey about 340 g. Using one ingredient's density for another is the most common cause of dry cakes and dense breads, so always confirm the ingredient selected above matches what is in your bowl.

For the most repeatable results, weigh water on a digital scale instead of relying on volume. If you are scaling a whole recipe, use the recipe scaler to multiply every ingredient at once, then verify individual amounts with this converter.

Frequently asked questions

How many grams is a cup of water?

One US cup of water weighs about 237 grams (8.36 oz). That density is what this converter uses, so volume and weight results stay consistent for every measurement on the page.

How many grams is 4 oz of water?

4 oz of water equals about 113.4 g (113.4 g), or 113.4 grams. Use the converter above for any other amount.

Why does water convert differently from other ingredients?

Weight-to-volume conversions depend on ingredient density. A cup of water weighs about 237 g, while a cup of granulated sugar weighs about 200 g and a cup of water 237 g. That is why a single "cups to grams" number cannot apply to every ingredient.

Are these Ounces to Grams conversions exact?

They use standard average densities for water (about 237 g per cup). Actual weight varies with how the ingredient is packed, sifted, or ground, so weigh on a digital scale when a recipe is sensitive to hydration or leavening.