Water: Cups to Grams
One US cup of water is about 236.59 g (fats & liquids); a tablespoon is about 14.8 g and 100 g is about 0.423 cups. Convert any amount below.
Reference weight: density 1.00 g/ml. Source checked 14 August 2026; cup-to-weight results remain approximate because packing and product density vary.
Weight uses water's real density. Volume↔volume and weight↔weight are exact for any ingredient; cup→gram uses a cited reference weight (packing and cup size vary by ±5%).
Note: For water, millilitres and grams are interchangeable (1 ml = 1 g).
Water — volume to weight
Common cup and spoon amounts of water, converted to grams, ounces and millilitres.
| Amount | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 tsp | 4.93 g | 0.174 oz | 4.93 ml |
| 1 tbsp | 14.8 g | 0.522 oz | 14.8 ml |
| ¼ cup | 59.1 g | 2.09 oz | 59.1 ml |
| ⅓ cup | 78.9 g | 2.78 oz | 78.9 ml |
| ½ cup | 118 g | 4.17 oz | 118 ml |
| ⅔ cup | 158 g | 5.56 oz | 158 ml |
| ¾ cup | 177 g | 6.26 oz | 177 ml |
| 1 cup | 237 g | 8.35 oz | 237 ml |
| 2 cups | 473 g | 16.7 oz | 473 ml |
Water — weight to cups
Weigh water on a scale? Here is what each weight is in cups and tablespoons.
| Grams | Cups | Tablespoons | Ounces |
|---|---|---|---|
| 10 g | 0.042 | 0.676 | 0.353 oz |
| 25 g | 0.106 | 1.69 | 0.882 oz |
| 50 g | 0.211 | 3.38 | 1.76 oz |
| 100 g | 0.423 | 6.76 | 3.53 oz |
| 150 g | 0.634 | 10.1 | 5.29 oz |
| 200 g | 0.845 | 13.5 | 7.05 oz |
| 250 g | 1.06 | 16.9 | 8.82 oz |
| 500 g | 2.11 | 33.8 | 17.6 oz |
| 1000 g | 4.23 | 67.6 | 35.3 oz |
Why weigh water instead of measuring cups?
A cup measures volume, but recipes really care about how much water you add by weight. One US cup of water is taken as 236.59 g here, cited from density 1.00 g/ml, and every conversion on this page routes through that figure. Volume-to-volume and weight-to-weight steps are exact, but the cup→gram crossing depends on product form and how the water is packed, so a kitchen scale is the reliable way to hit the same result every time.
FAQ
How many grams are in a cup of water?
One US cup of water weighs about 236.59 g (source: density 1.00 g/ml). For water, millilitres and grams are interchangeable (1 ml = 1 g).
How many grams are in a tablespoon of water?
One tablespoon of water is about 14.8 g, and one teaspoon about 4.93 g, since a US cup is exactly 16 tablespoons (48 teaspoons).
How much is 100 g of water in cups?
100 g of water is about 0.423 cups. Use the converter above for any other weight — it works in both directions.
Is the cup-to-gram figure for water exact?
The cup weight is a cited reference (density 1.00 g/ml); volume↔volume and weight↔weight conversions on this page are exact, but the cup→gram step depends on packing, humidity and brand, so it is best treated as ±5%. A kitchen scale removes the guesswork.