Liquids
Convert millilitres of water to grams
One millilitre of water weighs about 1 g, and half a millilitre comes to roughly 0.501 g. Enter any amount below to convert it, or use the chart further down as a quick reference while you cook.
1 ml of water =
1 g
- oz
- 0.035
- kg
- 0.0010
- lb
- 0.0022
Water: 237 g per US cup · NIST Handbook 133. Water is the reference: 1 ml = 1 g. This is the only ingredient where volume and weight convert exactly.
Full water chart →Water at a glance
Every number on this page comes from a single figure: 237 grams per US cup (NIST Handbook 133).
- 1 cup
- 237 g
- 1 tablespoon
- 14.8 g
- 1 teaspoon
- 4.94 g
- 1 cup in ounces
- 8.36 oz
- 100 g in cups
- 0.422 cups
- Density
- 1.00 g/ml
millilitres to grams chart for water
Print it, screenshot it, or bookmark this page — these are the amounts recipes ask for most often.
| Millilitres | Grams | Ounces (weight) | Pounds |
|---|---|---|---|
| 15 ml | 15 g | 0.53 oz | 0.033 lb |
| 30 ml | 30.1 g | 1.06 oz | 0.066 lb |
| 50 ml | 50.1 g | 1.77 oz | 0.11 lb |
| 60 ml | 60.1 g | 2.12 oz | 0.133 lb |
| 100 ml | 100 g | 3.53 oz | 0.221 lb |
| 120 ml | 120 g | 4.24 oz | 0.265 lb |
| 150 ml | 150 g | 5.3 oz | 0.331 lb |
| 200 ml | 200 g | 7.07 oz | 0.442 lb |
| 240 ml | 240 g | 8.48 oz | 0.53 lb |
| 500 ml | 501 g | 17.7 oz | 1.1 lb |
How this conversion is calculated
Volume-to-weight conversions are only as good as the density behind them. We treat water as 237 g per US customary cup, which works out to 1.002 g/ml. From there:
- Your millilitres figure is converted into millilitres or grams using standard unit sizes (ml = 1 ml).
- The density above bridges volume and weight in whichever direction you need.
- The result is rounded the way a cook would round it — to the nearest gram, or to a usable fraction such as 3/8 cups.
Measuring water accurately
Water is the reference: 1 ml = 1 g. This is the only ingredient where volume and weight convert exactly.
If a recipe matters to you — bread, macarons, anything with a tight hydration or ratio — weigh it. A £10 digital scale removes the single largest source of variation in home baking, and it is faster than washing three measuring cups.
When cups are fine
- Liquids measured in a proper jug, where volume is the honest unit anyway.
- Forgiving savoury cooking: soups, stews, stir-fries, marinades.
- Small amounts of leaveners and spices, as long as you use level spoons.
Frequently asked questions
How many grams are in 1 millilitre of water?
1 millilitre of water is 1 g. This is based on a density of 237 g per US cup.
How many grams are in 2 millilitres of water?
2 millilitres of water is 2 g, and 0.501 g for half a millilitre.
How much is 100 g of water in cups?
100 g of water is about 3/8 cups. Weight is always the more reliable measurement, so use a scale when the recipe gives grams.
Why do other sites give a different number for water?
Water is the reference: 1 ml = 1 g. This is the only ingredient where volume and weight convert exactly.
Do UK and Australian cups give the same result?
No. A US customary cup is 236.6 ml, a metric cup used in Australia and New Zealand is 250 ml, and an old UK imperial cup is 284 ml. Our default is the US cup, but you can pick metric cups in the converter.