How does one calculate adjusted gross income?

You can learn how to calculate adjusted gross income (AGI) by subtracting the amounts listed in lines 23-35 on your 1040 tax form from your gross income. You can learn more about how to calculate AGI by visiting the LearnVest website. Once on the page, scroll to the bottom and click on "Knowledge Center," then type "AGI" into the search field at the top of the page and press enter to bring up the information.