your question can only be answered by yourself when you take certain things into account.
How much cash to you want to take per week?
How much cash do you NEED to take per week?
How long are you intending to hold positions?
What products/instruments are you intending to trade?
How much risk on each investment?
Total risk limits undertaken?
How much % do you expect to generate per week?
There are other q's, but answer these and this should give you a good idea of capital required to day trade. Everyones trading differs so only you can decide using these guidelines as an aid.