Convert milliliters to grams by entering a volume in mL and selecting your ingredient — or enter a custom density (g/mL) for any substance. You get back the weight in grams along with the density used, so you can confidently measure ingredients by weight from a volume measurement.
Weight in Grams
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Density Used
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Volume
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To convert milliliters to grams, multiply the volume in milliliters by the density of the ingredient in grams per milliliter (g/mL). The formula is: grams = milliliters × density. For example, 100 mL of water (density 1.0 g/mL) equals 100 g, while 100 mL of all-purpose flour (density ~0.529 g/mL) equals about 52.9 g.
Milliliters measure volume and grams measure mass — two different physical quantities. The relationship between them depends on the density of the substance. Water has a density of 1 g/mL so 1 mL = 1 g, but denser or lighter substances will give different results. Without knowing the density, the conversion is not possible.
A milliliter (mL) is a metric unit of volume equal to one-thousandth of a liter. It is commonly used to measure liquids and small quantities of ingredients in cooking. One milliliter is equivalent to about 0.034 fluid ounces or roughly 0.2 teaspoons.
A gram (g) is a metric unit of mass equal to one-thousandth of a kilogram. It is widely used in cooking, nutrition, and science to measure the weight of ingredients and substances. One gram is approximately equal to 0.035 ounces.
The density of water is 1.000 g/mL at 4°C (39°F), which makes it the simplest conversion — 1 mL of water equals exactly 1 gram. At room temperature (around 20°C), the density is very slightly lower at about 0.998 g/mL, but 1.000 is used for all practical cooking and general purposes.
100 mL of all-purpose flour weighs approximately 52.9 grams, based on a density of 0.529 g/mL. Note that flour density can vary depending on how tightly it is packed, so results may differ slightly from scooping vs. spooning flour into a measuring cup.
Weight measurements in grams are generally more accurate for baking and cooking because they are not affected by how an ingredient is packed or the shape of a measuring cup. Volume in milliliters is commonly used for liquids. Professional bakers and recipes from Europe typically specify ingredients by weight for more consistent results.
You can find the density of most food ingredients in nutrition databases, ingredient data sheets, or published food science references. Density is typically expressed in g/mL or g/cm³ (they are equivalent). For the most accurate results, look up the specific form of the ingredient (e.g. sifted vs. packed flour, melted vs. solid butter).