One gram of water is 1.0024925 millilitres, so converting grams of water to millilitres means multiplying by 1.0024925. That factor is specific to this ingredient — it comes from its density, not from any relationship between the two units.
Put next to water — 1 g per mL exactly — water measures 0.99751 g per mL. That ratio, 99.75%, is what separates this page from every other ingredient in the same units, and it is measured rather than defined.
Water has a density of 0.99751 g per mL, so 100 mL of it weighs 99.75 g and 250 mL weighs 249.4 g. That single figure is what every other number on this page is built from — water is 1.00 g per mL, so this ingredient is 99.75% as heavy as the same volume of water.
Grams are the unit this conversion is really for. A domestic scale resolves to a gram, which is 0.424% of a cup of water, so weighing gets an accuracy no measuring cup can reach. A 500 g pack of it is 2.119 cups, and a 1 kg pack 4.237.
How the figure is arrived at: The reference case. A US cup is 236.6 mL and water is 1 g per mL, so the two numbers are the same and every other ingredient can be read against it.
The formula
grams- The amount of water you are converting, in grams
1.00249252754- Millilitres per gram for water, from its density of 0.99751 g/mL
millilitres- The equivalent quantity in millilitres
How it works, step by step
- Enter the quantity in grams.
- It is multiplied by 1.00249252754, the millilitres-per-gram figure for water.
- The result appears in millilitres, with a second reading in tsp beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
50 g of water in millilitres
50 g of water weighs out at 50.1246 millilitres. Divide 50.1246 by 1.0024925 and you get back to 50 g, which is the quickest check that the factor is the right way up.
150 g of water in millilitres
A recipe calling for 150 g of water needs 150.374 millilitres on the scale. The arithmetic is 150 × 1.0024925 = 150.37388, and halving the recipe halves the weight to 75.1869 millilitres.
500 g of water in millilitres
Take 500 g of water: 500 × 1.0024925 gives 501.246 millilitres. Doubling the batch takes it to 1002.49 millilitres, because the relationship is a straight proportion once the density is known.
How to read your score
Frequently asked questions
How many millilitres are in 1 g of water?
One gram of water is 1.0024925 millilitres. Half that quantity is 0.501246 millilitres and double it is 2.00499 millilitres, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of water not 236 g like water?
Because weight per cup depends on what is in the cup. Water has a density of 0.99751 g per mL where water has 1.00, so a cup of it weighs 236 g rather than 236.6 g. That is a difference of 0.6 g per cup, and it is the reason a single volume-to-weight factor cannot be applied to every ingredient.
Does how I measure it change the weight?
Barely. Water does not compress, so a cup of it is 236 g however it is poured — within about 1%, which is inside the accuracy of a domestic scale. This is the group where measuring by volume is defensible.
Is a fluid ounce of water the same as an ounce?
No. A fluid ounce is a volume — one eighth of a US cup, 29.57 mL — and an ounce is a weight. One fluid ounce of water weighs 1.041 oz, so the two readings differ by 4.06%. They coincide only for something with the density of water, and then only roughly.
Is this a US cup or a metric cup?
US customary: 236.59 mL, which is the cup every US recipe means. A metric cup is 250 mL, so the same cup of water would weigh 249.38 g instead of 236 g — 13.4 g more, or 5.67%. Australian and some European recipes use the metric cup, and the difference is large enough to matter in baking.
Do I need a scale for this, or will measuring cups do?
At this size the spoon wins. One millilitre of water is 0.9975 g, and a scale reading to the nearest gram is working at 100% resolution on that — a measuring spoon is the more accurate instrument below about 5 g, which is why spice quantities are still written in spoons.
How much does 15 mL of water weigh?
15 mL of water comes to 14.963 g, or 14.963 grams. This page runs that calculation in reverse — enter a weight and it returns the volume — and the ml-to-grams page does it in the direction the question is usually asked.
Water in grams and millilitres
| Grams | Millilitres | Unrounded |
|---|---|---|
| 5 g | 5.01246 mL | 5.012462638 |
| 10 g | 10.0249 mL | 10.02492528 |
| 25 g | 25.0623 mL | 25.06231319 |
| 50 g | 50.1246 mL | 50.12462638 |
| 100 g | 100.249 mL | 100.2492528 |
| 125 g | 125.312 mL | 125.3115659 |
| 150 g | 150.374 mL | 150.3738791 |
| 200 g | 200.499 mL | 200.4985055 |
| 250 g | 250.623 mL | 250.6231319 |
| 300 g | 300.748 mL | 300.7477583 |
| 500 g | 501.246 mL | 501.2462638 |
| 1000 g | 1002.49 mL | 1002.492528 |
Based on 236 g per cup of water. One gram of water is 1.0024925 millilitres.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 236 g | 8.32 oz | 236.6 mL |
| 3/4 cup | 177 g | 6.24 oz | 177.4 mL |
| 2/3 cup | 157.3 g | 5.55 oz | 157.7 mL |
| 1/2 cup | 118 g | 4.16 oz | 118.3 mL |
| 1/3 cup | 78.67 g | 2.77 oz | 78.86 mL |
| 1/4 cup | 59 g | 2.08 oz | 59.15 mL |
| 1 tbsp | 14.75 g | 0.52 oz | 14.79 mL |
| 1 tsp | 4.917 g | 0.173 oz | 4.929 mL |
US customary measures: 1 cup = 236.59 mL, 1 tbsp = 14.79 mL, 1 tsp = 4.93 mL.
| Ingredient | Grams per cup | Ounces per cup | Density (g/mL) |
|---|---|---|---|
| Coconut oil | 218 g | 7.69 oz | 0.9214 |
| Mayonnaise | 220 g | 7.76 oz | 0.9299 |
| Cream cheese | 227 g | 8.007 oz | 0.9595 |
| Water (this page) | 236 g | 8.325 oz | 0.9975 |
| Heavy cream | 238 g | 8.395 oz | 1.006 |
| Vinegar | 239 g | 8.43 oz | 1.01 |
| Sour cream | 240 g | 8.466 oz | 1.014 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.