Use this FAFSA spreadsheet to calculate your EFC manually. https://studentaid.gov/sites/default/files/2022-23-fafsa-worksheet.pdf
There are many step by step directions on websites and even youtube if you need more detail. This book is also good for detailed explanations: https://www.amazon.com/Paying-College-2023-Everything-Admissions/dp/0593516494
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