Any free website/stock screener in which I can find historical P/E ratios (for eg past 5 years) for SG stocks?

P/E ratio varies from time to time so I think its rather impossible to have a record of it as it is changing when market moves up or down.

It relatest to the valuation of the company and how much multiple you are paying for that specific stock.

I am sure you already know

-Yahoo finance

-MSN money

-Morningstar.com

Where you can pull out financial data of the company.

Or you can actually go to the companies website under investor relations page.

I heard there is a paid subscription for bloomberg but i'm no analyst so I dont think I will go that far.

You can check that out!