# EAC - how many formula variation do you need to know for the exam

Hi all,

I just read the following from Head First 2nd Edition page 368.  "...turns out there are 25 different ways to calc. EAC....but for the PMP Exam you just need to know EAC=BAC/CPI" paraphrased....i find this hard to believe, but can anyone confirm this statement?

best, Paul. ### here you go..  EAC

here you go..

EAC Calcualtions for different scenario:

• No variances from the BAC have occurred or are expected to continueat the same rate of spending: EAC=BAC/CPI.(This is the formula most often required on the exam.)
• Original estimate was fundamentally flawed or conditions havechanged and invalidated original estimating assumptions: EAC =AC+ETC
• Current variances are thought to be atypical in the future. EAC =AC+BAC-EV (Though variances found but it will be on budget)
• Current variances are thought to be typical in the future. EAC =AC+((BAC-EV) / CPI) (The variances continue)

ETC Calcualtions for different scenario:

• ETC = EAC-AC - Expected total cost minus actual cost to date. Resultis a monetary value that will tell us how much more the project willcost.
•  ETC = BAC-EV - The planned budget minus the earned value. Resultis a monetary value that will tell us how much more the project willcost. Assumption: use formula if current variances are thought to beatypical in the future.
•  ETC = (BAC-EV) / CPI - The planned budget minus the earned valuemodified by project performance. Result is a monetary value that willtell us how much more the project will cost. Assumption: use formula if current variances are thought to be typical in the future

The essence of getting right in exam is work out on these practice questions as much as possible, so you find very easy going in real exam and you need not memorize these formulas..

http://www.scribd.com/doc/28680971/101-PMP-Sample-Questions-for-the-PMP-Exam

Regards

CN Patil

### thank you my friend. yes, it

thank you my friend. yes, it seems that you would need to know more than just the single, no variance formula for the exam.

best, Paul.

### EAC Formula

Here is the very good resource that will explain when to use which formal when you calculate EAC.

http://www.deepfriedbrainproject.com/2009/09/estimate-at-completion-eac-earned-value.html

I used it for my PMP test. I hope this helps.

Thanks,

Manish