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 Slab Calculators:
- 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
Lapping
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