Car Loan Total Payment Calculator: How to Work Out Your Full Repayment

How to Calculate Your Car Loan Payment and Total Repayment

The total repayment on a car loan is the sum of all monthly payments plus any down payment and fees, or in the case of a balloon loan, the final balloon payment. To calculate it, you need the loan principal (amount borrowed after down payment and trade-in), the annual percentage rate (APR), the loan term in months, and any additional loan fees. The monthly payment for a standard amortizing car loan can be calculated using the formula:

Monthly Payment = P × (r(1+r)^n) / ((1+r)^n - 1)

Where P is the principal, r is the monthly interest rate (APR divided by 12), and n is the number of monthly payments. Then, total repayment is simply monthly payment multiplied by the number of payments, plus any upfront fees. Total interest is total repayment minus the principal.

For example, on a $20,000 car loan at 5% APR for 60 months, the monthly payment is about $377.42, total interest is $2,645.20, and total repayment is $22,645.20. Use our step-by-step calculator below to work your own numbers.

Step-by-Step: How Do I Calculate My Car Loan Payment?

1. Determine the loan principal: Start with the car's purchase price, subtract any down payment or trade-in value, and add any fees rolled into the loan (e.g., documentation fees, sales tax if not paid upfront). This is the amount you are borrowing.
2. Find the APR: This is the yearly interest rate including most fees. Convert it to a monthly rate by dividing by 12. For example, 6% APR becomes 0.06/12 = 0.005.
3. Decide the loan term: Common terms are 36, 48, 60, or 72 months. Longer terms lower monthly payments but increase total interest.
4. Use the formula or an online auto loan total payment calculator: Plug in P, r, and n. The formula is given above. Online calculators do the math instantly.
5. Calculate total interest and total repayment: Multiply the monthly payment by the number of months to get total paid. Subtract the principal to get total interest. Add any upfront fees to get total repayment.

Remember, if the loan has a balloon payment, the monthly payment calculation changes: the balloon is a lump sum due at the end, so the loan is amortized as if the balloon is the future value.

What Are the Repayments on a $20,000 Car Loan?

The monthly payments and total interest on a $20,000 car loan depend on the APR and term. Here are example scenarios (assuming no down payment or fees):

Use these figures to compare. For example, if you can afford a higher monthly payment, a 36-month loan at 4% saves you over $1,600 in interest compared to a 60-month loan at 8%.

Car Finance Balloon Payment Calculator: Understanding Balloon Loans

A balloon payment is a large, lump-sum payment due at the end of a loan term, after a series of smaller monthly payments. This structure lowers monthly costs but leaves a significant payoff balance. To calculate payments for a balloon loan, you need the principal, APR, term, and the balloon amount (often expressed as a percentage of the car's value, e.g., 30%). The monthly payment is calculated as:

Monthly Payment = (P - B/(1+r)^n) × (r / (1 - (1+r)^(-n)))

Where P is principal, B is the balloon payment, r is monthly interest rate, and n is number of months. The total repayment includes the balloon; total interest equals total payments minus principal.

For example, a $20,000 car loan at 6% APR for 60 months with a 30% balloon ($6,000) would have a monthly payment of about $264.94, and the balloon is paid at the end. Compare that to a standard loan at $386.66 per month. The balloon loan saves $121.72 monthly but requires a $6,000 lump sum at the end.

How to Compare Car Loan Offers Side by Side

When evaluating financing offers, use a car loan total repayment calculator to see the full cost, not just the monthly payment. Create a table with columns: lender, loan amount, APR, term, monthly payment, total interest, total repayment, and any fees or balloon details. Fill in offers from different lenders to compare.

Key differences that matter:

• APR: Lower APR reduces total interest, but watch for fees that may increase effective APR.
• Loan term: Longer terms reduce monthly payments but increase total interest paid.
• Fees: Origination fees, documentation fees, and prepayment penalties can add to total cost.
• Balloon payment: If one loan has a balloon and another doesn't, compare the total repayment and your ability to handle the balloon at the end.

Missing information is not necessarily a drawback, but ask for clarification. A lender omitting the APR or total repayment figure should be questioned. Use your personal priorities: if cash flow is tight, prioritize lower monthly payment; if long-term cost matters, prioritize lower total repayment.

Amortization Schedule: Seeing Your Payoff Balance Over Time

An amortization schedule shows each payment's breakdown into principal and interest, and the remaining loan balance after each payment. This helps you understand how much of your payment goes to interest versus principal, and how the payoff balance decreases. You can generate a schedule using an auto loan total payoff calculator. For example, in the first month of a $20,000 loan at 5% for 60 months, $83.33 goes to interest and $294.09 to principal, leaving a balance of $19,705.91. Near the end, most of the payment goes to principal. This schedule helps you plan extra payments to reduce interest.