How many grams are in 1 cup of Water?
One US cup (240 ml) of water weighs about 240 grams. A US customary cup (236.6 ml) holds about 237 g, a metric cup (250 ml) about 250 g, and an imperial cup (284.1 ml) about 284 g.
Cups of Water to grams
One US cup (240 ml) of water weighs about 240 grams (8.5 oz), measured liquid measure.
Water is the reference everything else is measured against: 1 ml weighs 1 g for kitchen purposes, so a 240 ml US cup weighs 240 g. No technique, brand or humidity caveats apply.
Ingredient
240 grams
US cup · water · liquid measure
More precise value: 240 grams
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Water by cup standard
The same volume weighs more in a larger cup. These figures scale the reference weight of 240 g per 240 ml US cup by each cup standard’s exact volume.
| Cups | US cup | US customary cup | Metric cup | Imperial cup |
|---|---|---|---|---|
| ⅛ | 30 g | 30 g | 31 g | 36 g |
| ¼ | 60 g | 59 g | 63 g | 71 g |
| ⅓ | 80 g | 79 g | 83 g | 95 g |
| ½ | 120 g | 118 g | 125 g | 142 g |
| ⅔ | 160 g | 158 g | 167 g | 189 g |
| ¾ | 180 g | 177 g | 188 g | 213 g |
| 1 | 240 g | 237 g | 250 g | 284 g |
| 1½ | 360 g | 355 g | 375 g | 426 g |
| 2 | 480 g | 473 g | 500 g | 568 g |
water, liquid measure. Reviewed 2026-08.
Tablespoons and teaspoons
Spoon measures use the US definitions: 1 tablespoon = 14.79 ml (16 per cup) and 1 teaspoon = 4.93 ml (3 per tablespoon).
| Measure | Grams (g) | Ounces (oz) |
|---|---|---|
| 1 tsp | 4.9 | 0.17 |
| 1 tbsp | 14.8 | 0.52 |
| 2 tbsp | 29.6 | 1.04 |
| 4 tbsp (¼ cup) | 59.1 | 2.09 |
| 8 tbsp (½ cup) | 118.3 | 4.17 |
| 16 tbsp (1 cup) | 236.6 | 8.35 |
How to measure Water by volume
- Use any liquid measuring cup, filled to the line at eye level.
- Or skip the cup: put the bowl on a scale and pour to the gram — for water they are the same number in ml.
Why the weight varies
Water is the most predictable ingredient; temperature changes its weight by well under 1%.
Because water defines the density scale, it is the sanity check for every other conversion on this site: an ingredient’s grams-per-cup divided by 240 is its density relative to water.
Which value we publish, and why
We publish 240 g per US cup: at room temperature 240 ml of water weighs about 239.5 g (density ≈ 0.998 g/ml), which rounds to 240 g. USDA’s 8-fl-oz cup portion is 237 g.
Values you may see elsewhere
Frequently asked questions
How many grams is 1 tablespoon of Water?
One US tablespoon (14.79 ml) of water weighs about 14.8 g, and one teaspoon (4.93 ml) about 4.9 g.
How many ounces is 1 cup of Water?
One US cup of water weighs about 8.5 oz (240 g). Note these are weight ounces — for liquids, don’t confuse them with fluid ounces, which measure volume.