Estimated taxes on investment income

Hello!  New user here.

 I am trying to calculate estimated taxes for tax year 2020.  Here’s my situation:  I have about $10K in interest and dividends, and about $67K in long-term capital gains.  No other income.  I did not use TurboTax for tax year 2019 because I used a free file program.  How can I calculate estimated taxes for this year?