The Rebar Lapping Length calculator computes the length overlap needed at rebar joints based on the size of the rebar (rS) and the lapping factor (LF).
INSTRUCTIONS - Enter the following:
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.
When the dimensions of your slab or wall exceed the length of a single piece of rebar, it is required to lap thethem 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 -