Water — Measurement Converter
1 cup of water weighs about 237 g. Most people arrive here holding a packet, so the chart below runs from grams to cups: 100 g is about 3/8 cup, and 400 g is about 1 2/3 cups.
💡 Tip: Water is the reference all densities compare to: 1 cup is about 237 g, and 1 ml of water weighs exactly 1 g.
Water by weight: grams to cups
| Grams | Amount | Ounces |
|---|---|---|
| 50 | 1/4 cup | 1.76 |
| 100 | 3/8 cup | 3.53 |
| 113 | 1/2 cup | 3.99 |
| 150 | 5/8 cup | 5.29 |
| 170 | 3/4 cup | 6 |
| 200 | 7/8 cup | 7.05 |
| 225 | 1 cup | 7.94 |
| 250 | 1 cup | 8.82 |
| 300 | 1 1/4 cups | 10.6 |
| 400 | 1 2/3 cups | 14.1 |
| 500 | 2 1/8 cups | 17.6 |
Why water is the baseline for every conversion
Water is the reference point all other ingredient densities are measured against: 1 cup weighs about 237 g, and 1 ml of water weighs exactly 1 g. That tidy 1:1 relationship is why metric recipes can list water in grams or millilitres interchangeably — 250 ml of water is 250 g. It also explains why dense liquids like syrup weigh far more per cup, while flour and other dry goods weigh much less. When a recipe gives water by weight, you can pour it straight onto the scale rather than dirtying a measuring cup.
Water cup measurements, in grams
| Cups | Grams | Ounces |
|---|---|---|
| 1/4 | 59.3 | 2.09 |
| 1/3 | 79 | 2.79 |
| 1/2 | 119 | 4.18 |
| 2/3 | 158 | 5.57 |
| 3/4 | 178 | 6.27 |
| 1 | 237 | 8.36 |
| 1 1/4 | 296 | 10.4 |
| 1 1/2 | 356 | 12.5 |
| 2 | 474 | 16.7 |
Spoon reference: 1 tablespoon ≈ 14.8 g, 1 teaspoon ≈ 4.94 g.
How water compares with other liquids & dairy
237 g per cup places water in the middle of its category — lighter than heavy cream (238 g) and heavier than mascarpone (232 g).
That gap matters when you substitute by volume: use a cup of heavy cream where the recipe wanted water and you have added about 1 g extra — 0% more than intended. Weighing instead of scooping removes the problem.
Frequently asked questions
- How many cups is 100g of water?
- 100 grams of water is about 3/8 cup.
- How many grams is 2 cups of water?
- About 474 g — water runs roughly 237 g per US cup.
- How many cups is 150g of water?
- Around ⅝ of a cup.
- Does 1 ml of water equal 1 gram?
- Yes — for water, 1 ml weighs exactly 1 g, so 250 ml is 250 g. This holds only for water and very thin water-based liquids.
- How many grams is a cup of warm versus cold water?
- The difference is tiny in cooking — water expands slightly when heated, but 1 cup is about 237 g whether warm or cold.
- How much does 1 fluid ounce of water weigh?
- Almost exactly 1 ounce (about 29.6 g), since a US cup of water is roughly 8.4 oz by weight.
- How many grams is 1 cup of water?
- Reckon on 237 grams per US cup of water — about 8.36 ounces.
- How many cups is 250g of water?
- 250 grams of water is about 1 cup.
- How many grams is ½ cup of water?
- Half a cup comes to roughly 119 g of water.