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Rebar Weight

RW=f(l,4)
(l)Rebar Length
(rS)Rebar Size (2-12,14,16,18,20)
Tags
Masonry

The Rebar Weight calculator computes the total weight(w) of rebar based on the length (l) and size (s) of rebar.

INSTRUCTIONS: Choose units and enter the following:

  • (l) length of rebar
  • (rS) rebar size (2-12,14,16,18,20)  

Weight of Rebar (RW): The total weight of the specified length of rebar is computed and returned in pounds.  However, this can be automatically converted to many other weight units (e.g. kilograms or tons) via the pull-down menu.

Application of the Weight of Rebar Calculator:

Consider a basic construction materials problem where you need to compute the total weight of rebar for a job and you need the amount in pounds and kilograms.  For example, the project requires the following rebar:

  1. 700 pieces of 20 feet long rebar of size 6
  2. 300 pieces of 8 feet long rebar of size 5
  3. 400 pieces of 4 feet long rebar of size 4

Using the Weight of Rebar calculator:

  1. 20 feet of #6 is 30.1 pounds.  If you have 700 pieces of 20' #6, that's 700 x 30.1 pounds = 21,070 pounds or 9,558.5 kilograms
  2. 8 feet of #5 is 8.36 pounds. If you have 300 pieces of 8' #5, that's 300 x 8.36 pounds = 2,509 pounds or 1138.2 kilograms
  3. 4 feet of #4 is 2.69 pounds.  If you have 400 pieces of 4' #4, that's 400 x 2.69 pounds = 1,076 pounds or 487.7 kilograms
  4. And the total would be the sum of 21,070 pounds + 2,508 pounds + 1,076 pounds = 24,654 pounds 11,182.8 kilograms

General Rebar Information

Rebar is short for reinforcing bar.  Rebar is a roughly circular steel bar with ribs used to provide added tensile strength to concrete structures.  Rebar is put in place before concrete is poured.  When the concrete has hardened, the concrete around the rebar ribs keep the rebar in place.  Rebar and concrete expand similarly with temperature variations.  This all has the net result of substantially added tensile strength when rebar is part of the concrete form.  Carbon steel is the most commonly used material for rebar, which may also be coated with zinc or epoxy resin.

Rebar is laid out in grids, crisscrossed patterns of rebar, tied at the intersections where runs of rebar touch.  The grids have spacing between the rebar rows, and they are placed within the concrete form by a specified inset from the edge of the concrete.  Multiple parallel grids, at uniform space intervals, are referred to as rebar mats.  

Rebar Terms

  • Rebar - reinforcing steel bar.
  • Stick - one length of rebar.  In the U.S., the most common lengths of rebar sticks are 20', 40' and 60'.
  • Lapping - when two sticks of rebar are overlapped and bound together.
  • Lapping Factor - the multiple of a rebar diameter used to specify appropriate rebar lapping length.
  • Mat - a crisscross grid of rebar sticks.  There may be more than one mat with space in between mats.
  • Size - the indicator of the diameter of rebar sticks.  Note: guage is not a correct term for rebar.

Rebar Size

In the United States, rebar sizes are in increments of 1/8th inches in diameter.  Therefore, size 4 is 4/8th of an inch, which is 1/2", and size 8 is a full inch in diameter.  Based on this and the density of steel used in rebar, the Rebar Size Table contains reasonably accurate specifications of rebar linear weight and lateral (face) area based on rebar size.

Rebar Lapping

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The most common lengths of pre-cut rebar in the United States are 20`, 40' and 60'.  These are known as rebar sticks.  When the dimensions of a slab, wall or other form exceed the length of a single stick of rebar, it is required to rebar lapping length.  The length of the lap is specified by a "Lapping Factor (LF)" which is often 40 or 60 times the diameter of the rebar. Engineering specifications of a lapping factor should always be applied.

Rebar Tools

A class of rebar tools, both powered and manual, have been developed to aid construction workers in working with rebar.  These include the following:

  • Rebar Cutters are used to cleanly and safely cut sections of rebar.
  • Rebar Benders are used to bend rebar sticks precisely to fit into concrete forms.
  • Rebar Tiers are used to tie rebar grid intersections and for rebar lapping. 

Rebar and Slab Calculators: