Specific gravity is the ratio of the density of a substance versus the density of water at a set temperature. Specific gravity is a unitless measure. Water has a specific gravity of 1.0. Materials with a specific gravity less than 1.0 are less dense than water. These materials take up more volume per weight than water. Bath oil is a good example of this. Materials with a specific gravity greater than 1.0 are more dense than water. These materials take up less volume per weight than water. Mud Masque is an example of this type of product.

Below you will find a convenient place to computer the volume, weight, or specific gravity of a material. Simply input any two known values in the appropriate blanks and then click on the "Calculate" button to complete the conversion process. If you entered in mls, the weight will be in grams, while if you entered in fluid ounces your answer will be in ounces and vice versa.

FDA regulations state that the net quantity of contents must appear on all cosmetic packaging. This includes both US weight and the metric equivalent.

The net quantity of contents are stated differently dependent on the type of product:

Weight or mass: Used for solid, semisolid or viscous products eg. powders, heavy thick creams, bar soap etc.

Volume or Liquids/Fluids: Used for liquids such as lotions, bath gels, shampoos - usually anything that can be poured.

Please note - these conversions are only for products retailed in the US.