The Total Grid Rebar Length calculator computes the total length of rebar needed for one or more mats of rebar in a concrete slab.
INSTRUCTIONS: Choose units and enter the following:
Length of Rebar (LR): The calculator returns the length of rebar in feet. However, this can be automatically converted into other length units (e.g. meters or yards) via the pull-down menu.
The algorithm calculates the area of the slab, and calculates the length of rebar needed for a rectangular grid within the slab. The grid is specified by the inset from the edge of the slab and the nominal separation between horizontal and vertical rows of rebar (onCenter - see diagram). Once the algorithm calculates the length of rebar, the length is used with the user specified rebar size for the rebar lapping length (see below).
The user specified parameters are:
The calculation determines the need for an extra rebar using an internal tolerance for for a spacing fraction that exceeds the tolerance with a default of 1".
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.
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.
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.pieces to create the added length. This process is called lapping, and the length of the overlapping rebar is the
The following are price estimates of rebar products based on the current market price of steel and a reasonable markup from raw steel to retail rebar product. NOTE: Always use local pricing! The following prices are for calculating convenience. vCalc makes no warranty on the pricing, and does not guarantee material availability at this price.
|Current Rebar Price Estimate (2023-09-22)|
|Rebar Size||20' Price||40' Price|
|#3 - 3/8"||$5.61 USD||$10.36 USD|
|#4 - 1/2"||$7.48 USD||$18.66 USD|
|#5 - 5/8"||$13.64 USD||$28.56 USD|
|#6 - 3/4"||$21.12 USD||$41.56 USD|
|#8 - 1"||$38.81 USD||$71.34 USD|
The above price estimates are derived from the current market price of steel and an observed markup from raw steel to rebar products.