Car Loan Amortization Schedule Calculator

This car loan amortization schedule calculator estimates your monthly payment and total interest from the amount borrowed, APR, and loan term. Enter those figures to see the level-payment estimate; an amortization schedule then shows how each payment is divided between interest and principal over time.

Formula

The calculator uses the standard fixed-payment loan formula. The monthly payment is the amount that, when paid for the full term, repays the principal and interest, assuming the stated APR is divided into monthly periods:

Payment = P × r ÷ [1 − (1 + r)⁻ⁿ]

• P is the amount financed, in dollars.
• r is the monthly interest rate, calculated as APR ÷ 1,200 when APR is entered as a percentage per year.
• n is the number of monthly payments, calculated as years × 12.

Total interest in this estimate is the rounded monthly payment multiplied by the number of payments, minus the original principal: Total interest = payment × n − P. Using a payment rounded to cents can make the estimate differ slightly from an account’s final figures.

Worked Example

Using the calculator’s defaults—$20,000 principal, 8% APR, and a five-year term:

1. Convert the APR to a monthly rate: 8 ÷ 1,200 = 0.0066667.
2. Find the number of payments: 5 × 12 = 60.
3. Apply the payment formula: $20,000 × 0.0066667 ÷ [1 − (1.0066667)⁻⁶⁰] ≈ $405.53 per month, rounded to cents.
4. Estimate total interest using the rounded payment: $405.53 × 60 − $20,000 = $4,331.80.

The displayed results are therefore a monthly payment of $405.53 and total interest of $4,331.80.

Assumptions

• The interest rate stays fixed throughout the loan.
• Payments are equal monthly payments made at the end of each monthly period.
• Interest is calculated monthly using APR divided by 12; this is a simplifying model and may not match a lender’s exact day-count method.
• The calculation does not include fees, taxes, insurance, add-ons, or other charges unless they are included in the amount financed.

How a Car Loan Amortization Schedule Works

An amortization schedule is a payment-by-payment table. Each row typically lists the payment number or date, the payment amount, the interest charged for that period, the principal repaid, and the remaining balance. At the beginning, the balance is larger, so more of a level payment goes toward interest. As the balance falls, the interest portion generally shrinks and the principal portion grows.

For a monthly schedule, the basic calculation for each row is:

• Interest for the period = opening balance × monthly interest rate.
• Principal paid = payment − interest for the period.
• Closing balance = opening balance − principal paid.

The next period begins with the prior period’s closing balance. The final payment may differ by a small amount because lenders round interest and payments according to their servicing methods. A schedule is useful for understanding the expected path of the balance, but the calculator above reports summary figures rather than generating every dated row.

What the Results Tell You

The monthly payment is a formula estimate for the principal and interest component—not necessarily the full amount due on a vehicle purchase. If taxes, fees, or optional products are financed, they affect the payment only when they are part of the loan amount entered. Insurance, maintenance, fuel, and other ownership costs are outside this calculation.

Total interest estimates the cost of borrowing over all scheduled payments under the assumptions above. It is not the total amount paid: the estimated total of payments is principal plus interest, or $24,331.80 in the worked example. To understand a particular offer, use the amount financed, APR, and term from its written loan disclosure rather than a vehicle’s advertised price or an unverified estimate.

Using a Schedule and Avoiding Common Errors

Before relying on an estimate, check that the inputs describe the same loan. The loan amount should be the amount financed, not automatically the vehicle’s sticker price. A down payment, trade-in credit, financed taxes, fees, and add-ons can change that amount. APR is entered as a percentage per year—for example, enter 8 for 8%, not 0.08. The term is entered in years here; a 60-month term is five years.

• Confusing APR with a monthly rate: the formula divides APR by 1,200 to convert a percentage-per-year figure to a monthly decimal rate.
• Assuming all listed payment amounts include ownership costs: this estimate covers modeled loan principal and interest, not insurance or other separate bills.
• Ignoring payment timing or rounding: actual daily interest, due dates, and cent-rounding practices can produce small differences.
• Treating an extra payment as automatically reducing future interest: how an extra amount is applied depends on account handling and loan terms. A schedule based on regular payments does not model extra payments.

A schedule can help answer how quickly principal is expected to decline, but it does not establish what a lender will charge or how it will apply payments. For an exact payoff balance on a particular date, request the figure from the loan servicer; accrued interest and account-specific items may not appear in a basic schedule.

Frequently Asked Questions

What is an amortization schedule for a car loan?
It is a table estimating each scheduled payment’s interest and principal portions and the remaining loan balance after the payment.

How do I calculate a car loan payment?
Use the principal, monthly rate (APR divided by 1,200), and number of monthly payments in the fixed-payment formula shown above. The calculator applies that formula and rounds the payment to cents.

Why does more of my early payment go to interest?
Interest for a period is calculated on the outstanding balance. Since the balance is usually largest near the start, the interest portion is larger then; later, the reduced balance generates less interest.

Does this calculator include taxes and insurance?
No. It estimates principal and interest from the amount, APR, and term you enter. Include charges only if they are financed in the loan amount, and do not treat the result as a full vehicle ownership budget.

Why might my lender’s payment or final balance differ?
The lender may use different payment dates, daily-interest calculations, rounding, fees, or account-specific adjustments. Compare the calculator’s assumptions with the lender’s disclosure and servicing records.

This result is an estimate, and the lender’s disclosure gives the exact figures.

Related

• Interest Rate Sensitivity: Meaning and Loan Calculator
• Interest Rate Refinance Calculator: Compare Payments
• Interest Rate Right Now? What the Number Means

in p | Loan amount | $ | 20000 | 1 | 100000000
in apr | Interest rate (APR) | % | 8 | 0.01 | 100
in yrs | Loan term | years | 5 | 0.0833 | 50
out pmt | Monthly payment | $ | p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2