Older GM vehicles display fuel trim using the terms "Integrator" and "Block Learn". OBD2 rules normalized how trim is displayed and technicians are now used to viewing fuel trim in percentages.

• Integrator is short term fuel trim.
• Block Learn is long term fuel trim.
• Total fuel trim is the algebraic sum of long and short term fuel trim.

This calculator can be used to determine the total fuel trim calculation in percentage when all that is available in scan data is Integrator and Block Learn.