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The Cost of Financing a Car (Car Loans)
Learn about how monthly car payments (equated monthly installments) are calculated. Learn how interest rates/APR affect monthly payments, and how the length of a loan affects total interest paid.
This tutorial will include:
- How a Monthly Payment (Equated Monthly Installment) is Calculated.
- How Interest Rates/APR Affect Monthly Payments.
- How the Length of a Loan Affects Total Interest Paid
As always, the code used in this tutorial is located on my GitHub. With that, let’s get started!
How a Monthly Payment (Equated Monthly Installment) is Calculated
Your monthly payment, also called your Equated Monthly Installment (EMI) is defined by Investopedia as a fixed payment amount made by a borrower to a lender at a specified date each calendar month. Equated monthly installments are used to pay off both interest and principal each month, so that over a specified number of years, the loan is paid off in full.
A monthly payment can be calculated using an EMI formula similar to the one below.

