Auto Loan Calculator
Use the auto loan calculator above to estimate your monthly payment by entering your loan amount, APR, and term length. The results show your estimated payment breakdown, including how much interest you’ll pay over the life of the loan.
How Auto Loans Are Calculated
Auto loan payments use a simple interest formula that factors in three key components:
- Principal: The amount borrowed (vehicle price minus down payment/trade-in)
- Interest Rate (APR): Annual percentage rate (typically 3-10% for borrowers with good credit)
- Term: Loan duration in months (usually 36-72 months)
The formula: Monthly Payment = P × (r(1+r)^n)/((1+r)^n−1) where P=principal, r=monthly interest rate (APR/12), n=number of payments.
What Affects Your Payment
- Credit Score: Scores below 650 may see rates 5+% higher than prime borrowers
- Loan Term: A 72-month term reduces monthly payments but increases total interest by ~30% vs. a 48-month term
- Down Payment: Putting 10-20% down typically lowers payments by $50-$150/month per $5k financed
- Vehicle Age: Loans for used cars often have rates 1-2% higher than new vehicles
- Dealer vs. Direct Lender: Dealership financing may include hidden fees; credit unions often offer rates 0.5-1% lower
Tips to Lower Your Payment
- Improve your credit score before applying (pay down debts, correct errors)
- Compare lender rates – Online lenders often beat dealer financing
- Consider shorter terms – A 60-month loan at 5% APR costs less overall than 72 months at 4%
- Negotiate the vehicle price – Every $1,000 reduction saves ~$20/month on a 60-month loan
- Time your purchase – Dealers may offer better rates at month/quarter/year-end
Common Questions
Should I take a longer loan term for lower payments?
Only if necessary. While a 72- or 84-month term reduces monthly costs, you’ll pay significantly more interest and risk being “upside down” (owing more than the car’s value) for most of the loan.
How much should I put down?
Aim for at least 20% on new vehicles or 10% on used cars to avoid negative equity. For a $30,000 car, this means $6,000 down (new) or $3,000 (used).
Does refinancing an auto loan make sense?
Yes if rates have dropped significantly (1%+ lower than your current rate) or your credit score improved by 50+ points since taking the original loan.