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**Length of Rebar in Grid**: Computes the total length of rebar needed for one or more mats of rebar in a concrete slab based on slab dimensions, rebar spacing, inset from slab edge, number of mats, length of pre-cut rebar sticks, and a rebar lapping factor.**Weight of Rebar in Grid**: Computes the total length and associated weight of rebar needed for one or more mats of rebar in a concrete slab based on slab dimensions, rebar spacing, inset from slab edge, number of mats, length of pre-cut rebar sticks, a rebar lapping factor and the size of rebar.**Rebar and Concrete in Slab**: Computes the total length and weight of rebar and the volume and weight of concrete needed for a slab. The weight and volume calculations takes into account the concrete displaced by the rebar.**Wall (Rebar Concrete and Forms)**: Computes the length and weight of reinforcement bars (rebar) , volume of concrete and the surface area of forms for a wall based on the dimensions of the wall.**Rebar in an Irregular Shaped Slab**: Estimates the total length and weight of reinforcement bars (rebar) needed for an irregular shaped concrete slab**Rebar in a Circular Slab**: Estimates the total length and weight of reinforcement bars (rebar) needed for a circular shaped concrete slab.**Rebar Lapping Length**: Computes the length overlap needed at rebar joints based on rebar size and a lapping factor.**Rebar Cost Estimate**: computes the total cost of rebar based on the length being purchased, length of the individual pieces being bought and unit price of one piece of rebar.**Weight of Rebar**: Computes the total weight of rebar based on the length and size of rebar.**Concrete Displaced by Rebar**: Estimates the net weight added to a slab by adding rebar, and the reduction in concrete cause by adding rebar.**Weight of Slab with Rebar**: Estimates the weight of a rectangular slab with rebar base on the slab dimensions, rebar size and space and the know density of both concrete and rebar (steel). It also includes the individual weight of the components and the volume of concrete accounting for that displaced by rebar.

See also the Calculadora de Barras de Refuerzo Collection for the Spanish version of the above.