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`"Length"_"Rebar" = f( "length" , "width" , 18 , 3 , 1 )`

Enter a value for all fields

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:

- (
**L**) The length of the slab - (
**W**) The width of the slab - (
**oC**) The on-center spacing of the rebar spacing (defaults 18") - (
**i**) The inset distance from the side of the slab to the rebar grid (default of 3"). - (
**m**) The number of mats. (default is one). - (
**rL**) The length of the pre-cut reinforcement bars being used to determine if lapping is required. - (
**rS**) The size of rebar which is used to compute the diameter for lapping considerations. - (
**lF**) The lapping factor is the multiple of the diameter of the rebar to specify the lapping distance. 40 (default) and 60 are common.

**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.

- Length of Rebar in Grid
- Weight of Rebar in Grid
- Rebar in a Wall
- Rebar in an Irregular Shaped Slab
- Rebar in a Circular Slab
- Rebar Lapping Length
- Rebar Cost Estimate
- Weight of Length of Rebar
- Compute the
**Total Weight of a Slab with Rebar** - Spanish Version:
**Calculadora de Barras de Refuerzo**

The Total Grid Rebar Length calculator computes the total length of rebar in a rectangular grid.* Rebar Grid (one mat) with no lapping ** Rebar Specifications * 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.

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 and tie the rebar them 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 - Rebar Weight