Auto Amortization Loan Calculator
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Reviewed by Calculator Editorial Team
An auto amortization loan calculator helps you determine your monthly car payment, total interest paid, and loan amortization schedule. This tool uses standard loan formulas to provide accurate financial projections for auto loans.
How Auto Amortization Works
Auto amortization refers to the process of gradually paying off a car loan through scheduled payments that cover both principal and interest. The loan amortization schedule breaks down each payment into its principal and interest components.
Key Concepts:
- Principal: The original amount borrowed
- Interest: The cost of borrowing money
- Term: The length of the loan in months
- APR: Annual Percentage Rate (interest rate)
Loan Amortization Formula
The monthly payment (PMT) for an auto loan can be calculated using the standard loan payment formula:
This formula accounts for the interest that accumulates over the life of the loan, ensuring your payments cover both the principal and the interest owed.
Worked Example
Let's calculate a $20,000 auto loan with a 5% APR over 48 months (4 years).
| Month | Payment | Principal | Interest | Remaining Balance |
|---|---|---|---|---|
| 1 | $443.21 | $376.84 | $66.37 | $19,623.16 |
| 2 | $443.21 | $383.19 | $59.99 | $19,239.97 |
| 3 | $443.21 | $389.54 | $53.65 | $18,850.43 |
This example shows how each payment reduces the loan balance while paying interest on the remaining amount. The first payments pay more interest because the principal is still high.