If you are aware of the weight of one running meter of the product (e.g., pipes, fittings, boards, cloth, etc.), then transfer the initial value of ton will be quite simple. If necessary, you can just weigh it yourself. Don't have to do this is with a product meter length - if possible, it is sufficient to determine the weight of, for example, 20 linear centimeters, and then multiply it by five. Or Vice versa, knowing the weight of heavy items, divide it by the number of these meters. Receiving values for one meter, multiply by your desired number.
Weight many products can be identified by their markings - for example, it refers to the metal. This marking is applied to the product or recorded in accompanying documents and must meet the established state standards. Knowing her, by corresponding tables to find out the weight of each meter and multiply it by your desired number. For example, numbers assigned to various products of metal, and the corresponding weight of steammeters can be found in the table located on this page: http://unixmet.narod.ru/weight.htm.
If the weight of one meter is unknown, but there is information on the material you are interested in the product, and also its size, start with the definition of the volume occupied by each linear meter. Depending on the shape of the product it is necessary to apply different formulas. For example, the cross section of the metal bar is rectangular in shape, so to determine the volume, multiply the width by the height and length in any form is equal to one meter.
To determine the volume of the metal pipe it is necessary to know its internal and external diameters - multiply the number PI times the difference squared of larger and smaller radii, and the resulting value multiply the length of one meter. After receiving the value, multiply it by the specific gravity of the material - it can be found in their respective directories. So you calculate the weight of each meter and will receive the same source data described in the previous step. Will simply multiply the resulting value by the number of meters.