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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**) Length of Slab - (
**W**) Width of Slab - (
**oC**) On-center spacing of rebar - (
**i**) Inset distance from edge of slab to rebar grid - (
**m**) Number of Mats. - (
**rL**) Length of the pre-cut rebar - (
**rS**) Size of Rebar - (
**lF**) Lapping Factor. 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.

**Rebar and Concrete in a Slab:**The calculator returns all of the following:**Total Length**of rebar in feet**Total Weight**of rebar in pounds**Total Volume**of concrete in cubic yards. Note: this accounts for the concrete displaced by rebar.**Total Weight of Slab**in pounds. Note: this includes the weight of rebar and concrete.

- 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**

* Rebar Grid (one mat) with no lapping ** Rebar Specifications *

The Total Grid Rebar Length calculator computes 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 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