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Grams of Water to Cups
How many cups of water are in a given weight? Type a number of grams below to see the volume. Math uses water's density of 1.000 g/mL.
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100 g of water = 0.422676 cup
Grams of Water to Cups Conversion Table
Common values for water:
| Grams of water | Cups |
|---|---|
| 10 g | 0.042268 cup |
| 25 g | 0.105669 cup |
| 50 g | 0.211338 cup |
| 100 g | 0.422676 cup |
| 150 g | 0.634014 cup |
| 200 g | 0.845351 cup |
| 250 g | 1.0567 cup |
| 500 g | 2.1134 cup |
| 1000 g | 4.2268 cup |
How this works
Water has a density of about 1.000 g/mL (si definition). That means 1 mL of water weighs 1.000 grams.
Cups = grams × 0.0042
Note: By definition at 4°C. Within 0.5% across cooking temperatures.
Why a cup of water doesn't always weigh the same
Volume measurements are forgiving in some ways and brutal in others. A cup of water can vary by 10-20% in weight depending on how it's measured: spooned vs scooped, packed vs loose, sifted vs unsifted. The density figure used here matches the most common published recipe conventions, but if you're after baking precision, weighing on a kitchen scale is more accurate than measuring by volume.