Is there a way to accurately calculate my 2019 taxes? I know how much I earned and the deductions etc.

Until you enter all of your tax data to include all W-2's, Form 1099's and other income, credits and deductions into the 2019 tax return, you will not get an accurate answer.

Use the TurboTax online editions for tax year 2019 - https://turbotax.intuit.com/personal-taxes/online/

Or use the TurboTax desktop CD/Download editions for tax year 2019 - https://turbotax.intuit.com/personal-taxes/cd-download/

There are about a dozen different definitions of MAGI for different purposes. In order to calculate MAGI accurately, you have to know which definition applies, which depends on what you are using it for.