Solutions With Substance

Your engineering thermoplastic challenges demand precise calculations and material science expertise. Our technical staff has compiled the following volume to weight conversion formulas to help you determine the material quantities of your specific application in order to maximize manufacturing efficiency and control operating costs.

The Basic formula to convert volume to weight is:

(Volume) x (Specific Gravity) x (Conversion Factor) = Weight

The only tricky part of these calculations is to determine the proper conversion factor, which is dependent upon the units used to compute the volume, and the units desired for the weight. Below are several versions of this formula, with the proper conversion factors for different units.

If volume is measured in cubic inches, and you want the weight in pounds:

(cubic inches) x (specific gravity) x (0.0361) = (pounds)

If volume is measured in cubic centimeters, and you want the weight in pounds:

(cubic centimeters) x (specific gravity) x (0.0022) = (pounds)

If volume is measured in cubic millimeters, and you want the weight in pounds:

(cubic millimeters) x (specific gravity) x (0.0000022) = (pounds)

If volume is measured in cubic inches, and you want the weight in grams:

(cubic inches) x (specific gravity) x (16.387) = (grams)

If volume is measured in cubic centimeters, and you want the weight in grams:

(cubic centimeters) x (specific gravity) x (1) = (grams)

If volume is measured in cubic millimeters, and you want the weight in grams:

(cubic millimeters) x (specific gravity) x (0.001) = (grams)


The following conversion factors were used to develop the above formulae:

  • 1 cm3 = 0.061 in3
  • 1 in3 = 16.387 cm3
  • 1 cm3 = 1000 mm3
  • 1 lb = 453.592 gms
  • 1 gm = 0.0022 lb
  • 1 oz = 28.35 gms
  • 1 gm = 0.0353 oz
x =

One additional formula often needed is to convert from price per pound to price per cubic inch. This is calculated as follows:

¢/lb x .0361 x (specific gravity) = ¢/in3

¢/lb x =

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