The amount of money you need to be a day trader depends on what kind of account you open.
If you open a standard lot account,
mini lot account or micro lot account they all have different minimum requirements with each broker also applying it`s own rules to how much money you need to fund your trading account.
I suggest $25,000 - $50,000 for a standard account,
$5,000 to $10,000 for mini account and $1000 - $ 2500 for a micro account.
You have to remember that you are probably going to lose more than 50% of your trades.
Does your trading system handle 10 losing trades in a row.
What does your trading account look like after 10 losing trades.
If you don`t know you are on your way to an empty trading account.
Knowing how much you need to fund a trading account is not where you want to start to succeed in trading.