Auto Loan Calculator Online
Calculate monthly car loan payments, total interest, and complete vehicle financing costs.
Input Parameters
Live Result
Details
Steps
Calculate net loan principal (Price - Down Payment + Sales Tax)
Apply standard PMT annuity formula for monthly payment
Calculate total interest and total cost of ownership
Quick Answer & Understanding Your Result
An Auto Loan Calculator computes your monthly car payment, total interest charges, and overall cost of vehicle ownership based on vehicle price, down payment, trade-in value, interest rate, and loan term.
The 20/4/10 Rule for Car Buying
- 20% Down Payment: Put down at least 20% in cash or trade-in value to avoid immediate negative equity (owing more than the car is worth).
- 4-Year Loan Term: Finance the vehicle for no longer than 48 months (4 years) to minimize total interest paid.
- 10% of Gross Income: Total transportation costs (car payment + auto insurance + fuel + maintenance) should not exceed 10% of monthly gross income.
Auto Financing Components
- Financed Amount: Loan Amount = Car Price - Down Payment - Trade-In + Sales Tax & Fees.
- Monthly Debt Service: Computed via standard amortization annuity formulas over 24 to 84 months.
Enter your vehicle price and financing terms above to calculate your exact monthly car payment.
Formula & Calculation Logic
Mathematical Formular is monthly interest rate (APR / 12); n is total loan term in months.
Step-by-Step Guide
Enter Vehicle Price
Input sticker price or negotiated purchase price.
Set Down Payment & Trade-In
Input cash down payment and trade-in credit.
Select Loan Term
Choose 36, 48, 60, or 72 months.
Review Total Cost
View monthly car payment and total interest paid.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| $35,000 Car with $7,000 Down at 5.5% for 48 Months | 20% down ($7k) on $35k car financed over 4 years at 5.5% APR. | ||
| Budget Used Car: $15,000 (10% Down, 48 Mo, 8.5%) | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
Federal Trade Commission (FTC) - Financing or Leasing a Car
Edmunds - Auto Loan Interest Rates and Buying Guides
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: Loan Principal = Vehicle Price - Down Payment - Trade In + Sales Tax
Last Reviewed: August 21, 2026
Primary Source: Federal Trade Commission (FTC) - Financing or Leasing a Car
Reference Document: Edmunds - Auto Loan Interest Rates and Buying Guides
Computation Privacy: 100% client-side 0ms computation, zero data retention
Calculated financial results are modeled based on standard financial and mathematical formulas. For actual contracts or commercial loans, official amortizations will depend on lender-specific terms, fees, and regulatory provisions.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.