Auto Loan Calculator

Monthly payment · Amortization · Total cost of ownership · Scenario analysis · Lease vs Buy

$
$
$
%
MONTHLY PAYMENT $543
Total Interest
Payoff Date
LTV
Deal Grade A
Loan Amt
+
Interest
+
Tax & Fees
=
Total Cost
Monthly P&I
Total Interest
Payoff Date
LTV Ratio
Effective APR
Interest % of Price
Vehicle Price
− Down Payment & Trade-in
+ Tax & Fees
= Loan Amount
Total Interest Paid
Total Cost of Loan
Loan-to-Value (LTV)
Budget Health
20/4/10 Rule
≥20% Down
≤48 mo Term
≤10% Income
Amortization Schedule
# Date Payment Principal Interest Balance
Quick What-If Scenarios
Click any card to instantly apply and see the impact
💰 Put 20% Down
📅 48-Month Term
Excellent Credit
+$100/mo Extra
📆 Bi-weekly Payments
📈 Improve Credit 1 Tier
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How to Use This Calculator

1

Enter Loan Details

Input the vehicle price, down payment, loan term, and interest rate.

2

Add Trade-In

Include any trade-in value or manufacturer rebates to reduce the loan amount.

3

Review Payment Schedule

See your monthly payment, total interest, and amortization breakdown.

Formula & Methodology

Monthly Payment

M = P[r(1+r)^n] / [(1+r)^n - 1]

Where P = loan amount, r = monthly interest rate, n = number of monthly payments.

Total Interest

Total Interest = (Monthly Payment x n) - Principal

The total amount paid above the original loan balance over the life of the loan.

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Key Terms Explained

APR Annual Percentage Rate — the yearly interest rate charged on the loan, including fees.
Principal The original amount borrowed, calculated as vehicle price minus down payment and trade-in.
Amortization The process of paying off a loan through regular payments that cover both interest and principal.
Upside Down Owing more on the loan than the vehicle is currently worth, common in the early years of long-term loans.
Loan-to-Value The ratio of the loan amount to the vehicle's value. Lenders typically cap this at 100-125%.
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Real-World Examples

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Alex

New Car Purchase

Inputs: Price: $35,000, Down payment: $5,000, Rate: 5.9%, Term: 60 months

Result: Result: Monthly payment = $579, Total interest = $4,740. The loan costs about $95/year per $10,000 borrowed.

Loan Term Comparison ($30,000 at 6%)

TermMonthly PaymentTotal InterestTotal Paid
36 months$913$2,868$32,868
48 months$704$3,792$33,792
60 months$580$4,800$34,800
72 months$497$5,784$35,784
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Smart Auto Loan Strategies

Shorter Terms Save Thousands

While a 72-month loan has lower monthly payments, it costs significantly more in total interest and keeps you underwater longer. Aim for the shortest term you can afford — ideally 48 months or less.

The Down Payment Sweet Spot

Putting 20% down avoids being upside-down on day one and often qualifies you for better rates. At minimum, cover taxes, title, and fees out of pocket so you're not financing transaction costs.

Dealer vs. Bank Financing

Get pre-approved by your bank or credit union before visiting the dealer. This gives you a baseline rate to negotiate against. Dealers sometimes offer promotional rates on new cars that beat bank rates.

Frequently Asked Questions

How does the loan term affect my total cost?+

A longer loan term (60-72 months) lowers your monthly payment but significantly increases total interest paid. A shorter term (36-48 months) means higher monthly payments but you pay far less in interest overall and build equity in the vehicle faster.

Should I include sales tax and fees in my auto loan calculation?+

Yes, including sales tax, registration fees, and dealer fees gives you a more accurate picture of your true monthly payment and total loan cost. Many buyers underestimate these costs, which can add thousands to the financed amount.

What credit score do I need for the best auto loan rates?+

Borrowers with credit scores above 740 typically qualify for the lowest interest rates, often 3-5% for new cars. Scores between 660-739 see moderate rates, while scores below 660 may face rates of 10% or higher, dramatically increasing total cost.

How much should my down payment be on a car?+

Financial experts recommend a down payment of at least 20% for new cars and 10% for used cars. A larger down payment reduces your monthly payment, lowers total interest, and helps prevent being underwater on the loan if the car depreciates quickly.

Is it better to finance through a dealer or my bank?+

Getting pre-approved through your bank or credit union before visiting the dealer gives you a baseline rate to negotiate against. Dealers sometimes offer promotional rates (like 0% APR), but these may require forgoing manufacturer rebates that could save you more money overall.

How is a car payment calculated?

Monthly car payments are calculated using the loan amount, annual interest rate, and loan term. The formula accounts for principal and interest, so a $25,000 loan at 6% APR for 60 months results in approximately $483 per month.