Used in modern construction to enhance the tensile strength of concrete, rebar is a bar made of steel that can be embedded in masonry and concrete. Although unfinished steel is the most common rebar material, newer rebar covered in epoxy or fibres have been developed for use in corrosion-prone environments. The weight of a length of rebar varies depending on the diameter of the rebar and its material composition.

### Rod Numbers

Rebar, short for reinforcing bar, is classified into rod numbers. Each number indicates the diameter of the rebar in inches. These numbers vary from #2, quarter-inch rebar specified for light-duty construction, to #18 rebar, 2.257 inches in diameter. The number corresponds to an increase of one-eighth inch in diameter.

### Rebar Weight

The rebar number is the most significant indicator of weight. Rebar number charts, available online, provide an indication of the diameter and weight that corresponds best to each rebar number. For the thinnest rebar, number 2, a one foot length weighs a mere .75.7 Kilogram. For the thickest, the same one foot length weighs 6.17 Kilogram.

### Weight of a 20' length of rebar

Given the variation in weight based on rebar number, the weight of a twenty foot length will vary significantly. The thinnest rod of rebar, if extended to twenty feet, will weigh 151 Kilogram. At the other end of the spectrum, the thickest rod will weigh in at 123 Kilogram.

### Number of Rebar Lengths in a Ton

One ton of rebar can be converted to 907 Kilogram. Based on the weight of a twenty foot length of rebar, one ton of rebar will contain at minimum seven lengths of #18 rebar. This same ton in #2 rebar would contain 598, twenty foot lengths.