check this out, doesn't this seem like an easy way to remember most of the Earned Value (EV) formulas?
http://pmblog.ninethsense.com/2011/11/evm-calculationsev-ac-pv-cpi-spi.html
You can get these formulas from this triangle:
CPI = EV / AC and SPI = EV / PV
EV = CPI * AC and EV = SPI * PV
AC = EV / CPI and PV = EV / SPI
http://pmblog.ninethsense.com/2011/11/evm-calculationsev-ac-pv-cpi-spi.html
You can get these formulas from this triangle:
CPI = EV / AC and SPI = EV / PV
EV = CPI * AC and EV = SPI * PV
AC = EV / CPI and PV = EV / SPI