You can use Microsoft Excel or Google Sheets to calculate the APR on your car loan. You’ll need to know:
Your monthly payment amount
The value of the loan without fees
If you don’t know your monthly payment amount, you can calculate it by typing this formula into a blank cell in your spreadsheet:
=PMT(interest rate as a decimal/12, number of months in loan term, loan amount, with fees)
The result should be a negative number. Once you have this number, you can calculate your APR by typing in this formula:
=RATE(number of months in loan term, estimated monthly payment as a negative number, value of loan minus fees)*12
The result should be an approximate APR for your loan.
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