It's one of the more complicated formulas but don't worry. It's not that difficult.
The formula is:
$\begin{equation}EAC=AC+\Bigg[\frac{(BAC - EV)}{(CPI * SPI)}\Bigg]\end{equation}$
where
EAC ... Estimate at Completion
BAC ... Budget at Completion, or 'total budget' or in layman's terms money put aside for the whole project. Often calculated as sum of all Planned Values (PV)
EV ... Earned Value, or simply, what you have done so far (more precicely how much money you have earned on the project so far)
SPI ... Schedule Performance Index
CPI ... Cost Performance Index

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