Auto Loan Calculator
The Auto Loan Calculator helps you understand the real cost of financing a vehicle before you walk into a dealership.
Inputs
- ›Vehicle Price — the total purchase price
- ›Down Payment — cash you're putting down upfront
- ›Loan Term — typically 24, 36, 48, 60, or 72 months
- ›Interest Rate (APR) — your expected or quoted rate
- ›Trade-In Value (optional) — reduces the financed amount
What It Calculates
- ›Monthly payment — your exact payment based on the inputs
- ›Total interest paid — the full financing cost over the loan term
- ›Total cost of the vehicle — price plus all interest
- ›Effective cost per month — including depreciation (informational)
Common Mistakes to Avoid
- ›Focusing only on the monthly payment. Dealers extend loan terms to lower the payment while increasing total interest. Always check total cost, not just monthly.
- ›Skipping the interest rate check. A few percentage points difference in APR on a $30,000 loan can mean thousands of dollars in extra interest.
- ›Not accounting for insurance. Add your expected monthly auto insurance to the calculator result to get the true monthly cost of owning this vehicle.
Rule of Thumb
A common guideline: your total vehicle expenses (payment + insurance + gas + maintenance) should stay under 15–20% of your monthly take-home pay. Use this calculator alongside the Paycheck Calculator to check that threshold.
Next Steps
Once you know the monthly payment, add it to your Budget Builder as an expense and debt to see how it affects your complete financial plan.