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: 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.
Rebar Grid (one mat) with no lapping Rebar Specifications
Thecomputes the total length of rebar in a rectangular grid. It employs lapping for dimensions (length or width) in excess of the user specified rebar lengths (rL: see Lapping below). A tolerance for determining the need for an extra rebar is set to less than one inch for a spacing fraction above the tolerance. Lapping is a function of the lapping factor and the diameter of the rebar size.
Make sure rebar size (rS), lapping factor (lF) and uncut rebar length (rL) are specified, because they are vital components when accurately computing lapping. When the dimensions of your slab or wall exceed the length of a single piece of rebar, it is required to lap andthem to create the added length. There are a few considerations. First, the length of the lap is often specified as 40 times the diameter of the rebar. In this case, 40 is lapping factor. 60 is also a common factor, but the engineering specifications should always be applied. See these YouTube videos to better understand rebar lap:
Second, the typical length of rebar is 40' and 60' in the United States.
See how much the rebar will weigh -