Convert Water from Cup (US) to Fluid Ounces

How many fluid ounces is 1 US cup of water?

1 US cup of water (H2O) is 8.12 fluid ounces. 2 US cups of water is 16.23 fluid ounces. 1/2 US cup of water is 4.06 fluid ounces. 1/4 US cup (0.25 US cup) of water is 2.03 fluid ounces. Use the converter below for any amount.

Water is the most fundamental ingredient in cooking and baking. Used to hydrate doughs and batters, cook pasta and grains, make stocks and sauces, and dissolve ingredients, it appears in almost every recipe in some form. One metric cup (250 ml) of water weighs exactly 250 grams or 8.82 ounces — a clean, round number because the gram was originally defined as the mass of one millilitre of water.

Many recipes — particularly from the US — list water in cups or fluid ounces, while others use millilitres or grams. This page lets you convert water between grams, cups, millilitres, fluid ounces, and more so you can match any recipe with whatever measuring equipment you have.

Also known as

  • H2O
  • drinking water
  • tap water
  • filtered water

No measuring cups? The tool below gets you close, and a measuring cup set keeps every batch the same.

Water Measurement Converter

Enter a value and pick your units.

Result

0 Fluid Ounces

Common Water Conversions

Here are the most common water conversions from cups (US) to fluid Ounces.

Cups (US)Fluid Ounces
0.25 cups (US)2.03 fl oz
0.5 cups (US)4.06 fl oz
0.75 cups (US)6.09 fl oz
1 cup (US)8.12 fl oz
1.25 cups (US)10.14 fl oz
1.5 cups (US)12.17 fl oz
2 cups (US)16.23 fl oz
2.5 cups (US)20.29 fl oz
3 cups (US)24.35 fl oz

Water Conversion Chart

The conversion chart below gives a quick reference for converting water from Cup (US) to Fluid Ounces and other measurements.

cup(US)fl ozcupgramsouncestbsptspml
0.25 cup (US)2.03 fl oz0.24 cup60 g2.12 oz4 tbsp12 tsp60 ml
0.5 cup (US)4.06 fl oz0.48 cup120 g4.23 oz8 tbsp24 tsp120 ml
1 cup (US)8.12 fl oz0.96 cup240 g8.47 oz16 tbsp48 tsp240 ml
2 cup (US)16.23 fl oz1.92 cup480 g16.93 oz32 tbsp96 tsp480 ml

Frequently Asked Questions

How many fluid ounces is 1 US cup of water?
1 US cup of water is 8.12 fluid ounces. The ratio is fixed, so 2 US cups of water is 16.23 fluid ounces and 0.5 US cups is 4.06 fluid ounces. Use the converter above for any quantity, or check the conversion chart on this page for the most common amounts at a glance. Open the water converter
How many fluid ounces is 1.5 US cups of water?
1.5 US cups of water is 12.17 fluid ounces. The ratio is fixed, so 1 US cup of water is 8.12 fluid ounces and 2 US cups is 16.23 fluid ounces. Type any other amount into the converter above for the exact figure, or use the chart below for the common ones.
How many fluid ounces is 2 US cups of water?
2 US cups of water is 16.23 fluid ounces. Conversions scale in a straight line, so halving or doubling a recipe keeps the same ratio. 1 US cup of water is 8.12 fluid ounces, and you can multiply or divide that figure to match whatever your recipe needs. Enter any amount in the converter above for an exact fluid ounces reading.
How many US cups of water is 8.12 fluid ounces?
8.12 fluid ounces of water is 1 US cup. The conversion works the same in reverse, so you can switch between fluid ounces and US cups without changing the result. This helps when a recipe lists US cups but you would rather weigh or measure in fluid ounces. The converter above and the chart below cover both directions for any amount.
How many fluid ounces is 1 US cup of H2O?
H2O is another name for water, so 1 US cup of H2O is 8.12 fluid ounces, exactly the same as water. The figure does not change with the name: 2 US cups is 16.23 fluid ounces and 0.5 US cups is 4.06 fluid ounces. Use the converter above for any quantity, or read the conversion chart on this page for the most common amounts.
Are water and H2O the same thing?
Yes. H2O is another name for water, so they are the same ingredient and convert identically. 1 US cup of water is 8.12 fluid ounces under either name, and 2 US cups is 16.23 fluid ounces. Recipes use the two names interchangeably, so you can follow either one without changing quantities or weighing any differently.
How many fluid ounces is 1/2 US cup of water?
1/2 US cup of water is 4.06 fluid ounces. The ratio is fixed, so 1 US cup of water is 8.12 fluid ounces and 2 US cups is 16.23 fluid ounces. Half measures come up often when scaling a recipe down, and the figure divides cleanly. Use the converter above for any other amount, or the chart below for the common ones.
How many fluid ounces is 1/4 US cup of water?
1/4 US cup (0.25 US cup) of water is 2.03 fluid ounces. The ratio is fixed, so 1 US cup of water is 8.12 fluid ounces and 2 US cups is 16.23 fluid ounces. Quarter amounts often come up when scaling a recipe down step by step, and the figure divides cleanly. Use the converter above for any other quantity, or the chart below for the most common amounts.

Other Ingredients

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