Trailing P/E
Trailing P/E multiple is based on last 12 months of actual earnings.
It is calculated by taking current stock price and dividing by trailing EPS.
Taking HUL example again where we calculated its EPS
HUL CMP-2100
FY21 EPS- 34.4
FY21 P/E =2100/34.4
Trailing P/E = 61x
Forward P/E
To calculate forward P/E we take forward EPS.
Use projected earnings for forward P/E calculation.
Estimates a company’s likely earnings per share for a given fiscal.
Using the same example of HUL, here is how you can calculate FY22 P/E
Forward P/E=Price/Forward EPS
FY22 P/E=2100/38.2
=55x