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`LL = diam( 8 )* 40 `

40

The **Rebar Lapping Length** calculator computes the length overlap needed at rebar joints.

**INSTRUCTIONS -** Enter the following:

- (
**rS**) Size of Rebar (choose from list) - (
**LF**) Lapping Factor. 40 (default) and 60 are common.

**Lapping Length (LL):** The calculator returns the length of rebar lap in inches. However, this can be automatically converted into other length units (e.g. centimeters) via the pull-down menu.

* BNT-40 Automatic Rebar Tier*

**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
- Concrete Displaced by Rebar
- Compute the
**Total Weight of a Slab with Rebar** - Spanish Version:
**Calculadora de Barras de Refuerzo**

When the dimensions of your slab or wall exceed the length of a single piece of rebar, it is required to lap the rebar and tie the bars 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