One milliliter of water is equal to one gram.

The density of water is 1g/cm?, that is, the volume of 1 gram of water is 1 cubic centimeter.

1cm?=1ml, that is, 1ml=1cm?.

To convert volume units into mass units, you need to look at the density of the substance. According to the formula: mass = volume * density,

Then the mass of 1ml of water = 1cm?*1g/ cm?=1g.

To sum up, one milliliter of water is equal to one gram.

Extended information:

Volume unit conversion:

Mass unit conversion:

Baidu Encyclopedia - Density

Baidu Encyclopedia—Milliliter