In 2019, the maximum contribution to all your individual IRAs (both Roth and Traditional) is $6,000 if you are under 50 and $7,000 if you are over 50.
There may also be limitations to how you can contribute based on your income and tax filing status.
First, your total contributions to all your IRAs (both Traditional and Roth) cannot be more than your taxable compensation for the year, if your compensation was less than the contribution limit.
Secondly, your Roth IRA contributions might be limited based on your filing status and income. You can check out these limitations here: Income Requirements.