Look at the specs on the back of the power brick.... if you see 220 or 240.... then no.... all you may need is a plug adapter and skip the converter.
I just came back from Asia (similar 240v) and all I needed was an adapter. I was making HD videos and left the laptop rendering overnight.
One tip I'll share with you is getting a universal Power Bar. Older hotels may not have enough places to charge a laptop, camera, GPS and other electronic creature comforts at the same time.
Airports can't get enough power outlets for everyone. Having a "universal" powerbar is really handy to share the power.
http://www.google.ca/images?q=universal%20power%20strip
