mL to Grams Calculator

How to Convert mL to Grams

Volume and mass are different physical properties. Millilitres measure volume (how much space a substance occupies), while grams measure mass (how much matter it contains). To convert between them, you need to know the density of the substance, which expresses how much mass is packed into each unit of volume.

The formula is straightforward:

Mass (g) = Volume (mL) x Density (g/mL)

For water at approximately 4 degrees Celsius, the density is exactly 1 g/mL, so 1 mL of water equals 1 gram. This is by design: the gram was originally defined as the mass of 1 mL of water. At room temperature (around 20 degrees Celsius), water's density is approximately 0.998 g/mL, which is close enough to 1 g/mL for most practical purposes.

Densities of Common Substances

Worked Example

Convert 100 mL of water to grams:

• Volume = 100 mL
• Density of water = 1.000 g/mL
• Mass = 100 x 1.000 = 100.00 g

Convert 250 mL of honey to grams:

• Volume = 250 mL
• Density of honey = 1.420 g/mL
• Mass = 250 x 1.420 = 355.00 g

Convert 125 mL (half cup) of flour to grams:

• Volume = 125 mL
• Density of plain flour = 0.530 g/mL
• Mass = 125 x 0.530 = 66.25 g

Why mL and Grams Are Different

Many people assume that mL and grams are interchangeable, but they measure fundamentally different things. A millilitre is a unit of volume in the metric system (one thousandth of a litre). A gram is a unit of mass. The two are related only through density. A substance with a high density, like honey or salt, will weigh more per millilitre than a low-density substance like flour or cooking oil.

This distinction matters in cooking and baking. Recipes written by weight (grams) are more precise and reproducible than those written by volume, because packing, settling, and sifting can change the volume of dry ingredients significantly without changing the amount of the ingredient needed. Professional bakers and food scientists typically use mass measurements for this reason.

Related Calculators

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• Cooking Measurement Converter: convert between cups, tablespoons, teaspoons, and metric units.
• Grams to Cups Converter: convert mass back to cup measures for common ingredients.
• Weight Converter: convert between grams, kilograms, ounces, pounds, and more.
• Density Converter: convert between density units such as g/mL, kg/m3, and lb/ft3.

Sources and method: Density values sourced from standard reference data (CRC Handbook of Chemistry and Physics; USDA food composition databases; manufacturer specifications for common cooking ingredients). Dry ingredient densities represent typical spooned or lightly scooped measurements at room temperature and will vary with packing method.

Dry ingredient densities (flour, sugar, cocoa) are approximations. The actual mass of a volume of dry ingredient depends on how it is measured, settled, and packed. For critical applications, always weigh ingredients on a kitchen scale rather than relying on volume conversions.