Convert Water from Cup to Cup (US)

How many US cups is 1 cup of water?

1 cup of water (H2O) is 1.04 US cups. 2 cups of water is 2.08 US cups. 1/2 cup of water is 0.52 US cups. 1/4 cup (0.25 cup) of water is 0.26 US cups. Use the converter below for any amount.

  • These figures use the metric cup (250 ml). A US cup is slightly smaller at 240 ml, so it holds a little less.
  • These figures use the US cup (240 ml). A metric cup is slightly larger at 250 ml, so it holds a little more.
  • Cup sizes are not standard worldwide, so the same cup of an ingredient can weigh more or less depending on the country. What is a cup measurement →

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 Cup (US)

Common Water Conversions

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

CupsCups (US)
0.25 cups0.26 cups (US)
0.5 cups0.52 cups (US)
0.75 cups0.78 cups (US)
1 cup1.04 cups (US)
1.25 cups1.3 cups (US)
1.5 cups1.56 cups (US)
2 cups2.08 cups (US)
2.5 cups2.6 cups (US)
3 cups3.13 cups (US)

Water Conversion Chart

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

cupcup(US)gramsouncestbsptspmlfl oz
0.25 cup0.26 cup (US)62.5 g2.21 oz4.17 tbsp12.5 tsp62.5 ml2.11 fl oz
0.5 cup0.52 cup (US)125 g4.41 oz8.33 tbsp25 tsp125 ml4.23 fl oz
1 cup1.04 cup (US)250 g8.82 oz16.67 tbsp50 tsp250 ml8.45 fl oz
2 cup2.08 cup (US)500 g17.64 oz33.33 tbsp100 tsp500 ml16.91 fl oz

Frequently Asked Questions

How many US cups is 1 cup of water?
1 cup of water is 1.04 US cups. The ratio is fixed, so 2 cups of water is 2.08 US cups and 0.5 cups is 0.52 US cups. 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 US cups is 1.5 cups of water?
1.5 cups of water is 1.56 US cups. The ratio is fixed, so 1 cup of water is 1.04 US cups and 2 cups is 2.08 US cups. Type any other amount into the converter above for the exact figure, or use the chart below for the common ones.
How many US cups is 2 cups of water?
2 cups of water is 2.08 US cups. Conversions scale in a straight line, so halving or doubling a recipe keeps the same ratio. 1 cup of water is 1.04 US cups, and you can multiply or divide that figure to match whatever your recipe needs. Enter any amount in the converter above for an exact US cups reading.
How many cups of water is 1.04 US cups?
1.04 US cups of water is 1 cup. The conversion works the same in reverse, so you can switch between US cups and cups without changing the result. This helps when a recipe lists cups but you would rather weigh or measure in US cups. The converter above and the chart below cover both directions for any amount.
How many US cups is 1 cup of H2O?
H2O is another name for water, so 1 cup of H2O is 1.04 US cups, exactly the same as water. The figure does not change with the name: 2 cups is 2.08 US cups and 0.5 cups is 0.52 US cups. 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 cup of water is 1.04 US cups under either name, and 2 cups is 2.08 US cups. Recipes use the two names interchangeably, so you can follow either one without changing quantities or weighing any differently.
How many US cups is 1/2 cup of water?
1/2 cup of water is 0.52 US cups. The ratio is fixed, so 1 cup of water is 1.04 US cups and 2 cups is 2.08 US cups. 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 US cups is 1/4 cup of water?
1/4 cup (0.25 cup) of water is 0.26 US cups. The ratio is fixed, so 1 cup of water is 1.04 US cups and 2 cups is 2.08 US cups. 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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