Millilitres of water to grams runs on one number, 0.99751367 grams per millilitre. It is a measured property of this ingredient rather than a defined conversion, which is why a generic volume-to-weight tool cannot give you it.
Water is the yardstick: 1 mL of it weighs 1 g. Water comes in at 0.99751 g per mL, or 99.75% of water, which is why a cup of it is 236 g rather than 236.6 g. Volume and weight only line up for water, and only in metric.
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.
The condition this weight assumes: 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
millilitres- The amount of water you are converting, in millilitres
0.997513669704- Grams per millilitre for water, from its density of 0.99751 g/mL
grams- The equivalent quantity in grams
How it works, step by step
- Enter the quantity in millilitres.
- It is multiplied by 0.997513669704, the grams-per-millilitre figure for water.
- The result appears in grams, with a second reading in oz beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
15 mL of water in grams
A recipe calling for 15 mL of water needs 14.9627 grams on the scale. The arithmetic is 15 × 0.99751367 = 14.962705, and halving the recipe halves the weight to 7.48135 grams.
100 mL of water in grams
Take 100 mL of water: 100 × 0.99751367 gives 99.7514 grams. Doubling the batch takes it to 199.503 grams, because the relationship is a straight proportion once the density is known.
250 mL of water in grams
Take 250 mL of water: 250 × 0.99751367 gives 249.378 grams. Doubling the batch takes it to 498.757 grams, because the relationship is a straight proportion once the density is known.
How to read your score
Frequently asked questions
How many grams are in 1 mL of water?
One millilitre of water is 0.99751367 grams. Half that quantity is 0.498757 grams and double it is 1.99503 grams, 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 many millilitres of water is 500 g?
500 g of water is 501.25 millilitres — 1.00249 millilitres to one gram, so 500 × 1.00249 = 501.25. Going that way is a division by 0.997514, or a multiplication by 1.00249 if you prefer.
Water in millilitres and grams
| Millilitres | Grams | Unrounded |
|---|---|---|
| 5 mL | 4.98757 g | 4.987568349 |
| 10 mL | 9.97514 g | 9.975136697 |
| 15 mL | 14.9627 g | 14.96270505 |
| 30 mL | 29.9254 g | 29.92541009 |
| 50 mL | 49.8757 g | 49.87568349 |
| 100 mL | 99.7514 g | 99.75136697 |
| 125 mL | 124.689 g | 124.6892087 |
| 150 mL | 149.627 g | 149.6270505 |
| 200 mL | 199.503 g | 199.5027339 |
| 250 mL | 249.378 g | 249.3784174 |
| 500 mL | 498.757 g | 498.7568349 |
Based on 236 g per cup of water. One millilitre of water is 0.99751367 grams.
| 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.