Auto Finance Calculator
Compare Loans, Leases, and Affordability with Dealer-Grade Accuracy
How This Tool Works
Unlike simple calculators that only use basic amortization formulas, the Ultimate Auto Finance Calculator incorporates tax logic, lease money factors, and residual values to give you a "Penny-Perfect" estimation.
Why Use This Calculator?
Dealers often bundle fees and markup interest rates (called "holding points"). By calculating your payment here first, you establish a baseline. If the dealer's number is higher than ours, you know there are hidden fees.
- Loan: Calculates standard APR financing.
- Lease: Uses the "Money Factor" method used by banks.
- Affordability: Reverses the math to tell you what car price fits your budget.
Understanding the Terms
Money Factor: The interest rate on a lease. To convert to APR, multiply by 2400. (e.g., 0.0025 = 6% APR).
Residual Value: What the car is worth at the end of the lease. A higher residual means a lower monthly payment.
Document Fee: A fee charged by the dealer to process paperwork. This varies by state.