Trending @Accenture; I have 4.5 years of experience and my current package is 8 lpa. How much I should ask for CTC to other companies like Infy , Capgemini ?

You can ask whatever you wish, but the companies you listed will give you 50-60% hike. And after that they'll avoid giving you any further hikes for 1-2 years going forward.

100 % hike