MAGI (Modified Adjusted Gross Income) is used for different reasons on a federal tax return and can include much more than what you have described.
See this TurboTax Tax Tip Guide - https://turbotax.intuit.com/tax-tips/irs-tax-return/what-is-the-difference-between-agi-and-magi-on-y...
What exactly are you trying to determine?
