Used Car Loan Calculator

A used car loan calculator estimates your monthly payment by dividing the financed amount (price minus down payment) across the loan term at your interest rate. Input the vehicle price, down payment, APR and loan length to see monthly payments, total interest paid and the full cost of financing before you visit a dealer or lender.

Budget the insurance too, not just the payment

The car payment is half the cost. Get auto insurance quotes for the vehicle before you sign anything.

Compare auto insurance

Takes about a minute. We match you with vetted pros in your area.

Section 01

How does a used car loan calculator determine my monthly payment?

The calculator uses the standard loan amortization formula: Monthly Payment = P × [r(1+r)^n] / [(1+r)^n - 1], where P is the principal (amount financed), r is the monthly interest rate (annual rate divided by 12), and n is the total number of monthly payments. For example, if you finance $18,000 at 7.5% APR for 60 months, the calculator converts 7.5% to a monthly rate of 0.00625, then applies the formula to arrive at a $360.07 monthly payment.

Section 02

What inputs do I need and what does each one mean?

You need four numbers. Vehicle price is the total purchase price on the window sticker or negotiated sale price. Down payment is the cash you pay upfront, which reduces the amount you finance—putting down $3,000 on a $20,000 car means you borrow $17,000. APR (annual percentage rate) is the interest rate the lender quotes; used car rates typically range from 5% to 14% depending on credit score and model year. Loan term is how many months you'll make payments, commonly 36, 48, 60 or 72 months. The calculator subtracts your down payment from the vehicle price, then spreads the remainder across the term at the given APR.

Section 03

How do I read the calculator output and use the results?

Key takeaway

The primary output is your monthly payment—the fixed amount due each month. The calculator also shows total interest paid, which is the cost of borrowing that money, and total amount paid, which is down payment plus all monthly payments.

Section 04

What assumptions does the calculation make?

The formula assumes a fixed interest rate for the entire loan, equal monthly payments and no fees beyond interest. It does not include sales tax, title and registration fees, documentation fees (often $200 to $500), gap insurance, extended warranties or prepayment penalties.

Section 05

What mistakes make the calculator result misleading?

Entering the wrong APR is the most common error. Dealers advertise promotional rates (0.9% or 2.9%) that apply only to new cars or top-tier credit; used car APRs are typically higher.

Section 06

Can I use this calculator for different down payment scenarios?

Key takeaway

Yes. Run the calculator multiple times with different down payments to see the trade-off between upfront cash and monthly cost.

Section 07

FAQ

Does this calculator include sales tax and fees?

No. The calculator shows only the financed amount, interest and payments.

What's a good interest rate for a used car loan?

As of 2024, average used car rates range from 6% to 12%, with excellent credit (720+ FICO) qualifying for 5% to 7%, good credit (660-719) seeing 7% to 10%, and fair credit (620-659) facing 10% to 14%. Rates also vary by vehicle age—cars older than six years often carry higher APRs.

Should I choose a 60-month or 72-month loan term?

Key takeaway

A 60-month term costs more per month but saves substantial interest and gets you out of debt faster. A 72-month loan lowers the payment but keeps you paying longer and increases the risk of owing more than the car is worth if you need to sell or trade early.

Can I pay off a used car loan early to save on interest?

Most used car loans allow prepayment without penalty, and paying extra each month or making a lump-sum payment reduces total interest. Check your loan agreement for any prepayment penalty clause—common in subprime auto loans—and confirm with your lender that extra payments go toward principal, not future interest.

How the interest calculator estimates compound growth

Compound interest applies each period’s rate to the starting balance plus previously credited interest. This interest computation differs from simple interest, which calculates interest only on the original principal. A daily compound interest calculator uses more compounding periods than a monthly or annual model, although the practical difference depends on the stated rate, account terms, and length of time.

Enter a starting amount, recurring contribution, assumed return, compounding frequency, and time horizon. The resulting future value calculator estimate is not a guarantee, particularly when modeling an investment with changing returns. For deposit accounts such as high yield savings, compare the annual percentage yield rather than relying only on the stated interest rate. The rule of 72 can provide a rough mental estimate, but a calculator offers more detail.

Common questions

People also search for

Part of the Money & Debt (incl. Student Loans) cluster.