Instructions
Calculate the material's volume by multiplying its length, width and height measurements, in terms of centimeters. The metric system is most commonly used when calculating steel.
Multiply the volume (measured in cubic centimeters) by the average density of steel material. Currently, the average density for all steel material is 7.8 grams per cubic centimeter.
Divide the weight (in grams) by 1,000. This will change the weight measurement of your material from grams to kilograms, which is the most popular way to communicate steel material within the steel industry.