.::: Create CDEF's on Cacti to Multiple or Division or other Calculation Mathematical Functions :::.

CDEFs allow you to apply mathematical functions to graph data to alter output. The concept of a CDEF comes straight from RRDTool, and are written in reverse polish notation (RPN). For more information regarding the syntax of CDEFs,

1. Console -> Management -> CDEF's -> New
  Name : Reamur

2. fill CDEF Item
cdef=CURRENT_DATA_SOURCE,4,*,5,/

.::: Create Graph Template Cacti base on OID/MIB :::.

Once one or more data sources are defined, an RRDTool graph can be created using the data. Cacti allows you to create almost any imaginable RRDTool graph using all of the standard RRDTool graph types and consolidation functions. A color selection area and automatic text padding function also aid in the creation of graphs to make the process easier.

Not only can you create RRDTool based graphs in cacti, but there are many ways to display them. Along with a standard "list view" and a "preview mode", which resembles the RRDTool frontend 14all, there is a "tree view", which allows you to put graphs onto a hierarchical tree for organizational purposes.

base on sample http://teguhth.blogspot.co.id/2018/01/monitoring-oidmib-temperature-fan-speed.html
A. Create Data Template
1. Console -> Data Template -> Add

2. Fill Data Template
  Data Templates
  Name : Temperature @ Ocelot