Auto Loan Calculator

Estimate your car payment including down payment, trade-in and sales tax.

Your inputs

Vehicle price ($)

Down payment ($)

Trade-in value ($)

Sales tax (%)

Fees added to loan ($)

APR (%)

Loan term (months)

Estimated monthly payment

—

Amount financed—

Estimated interest—

Total cash + payments—

How this calculator works

Sales tax treatment varies by state. This estimate subtracts trade-in value before calculating sales tax and adds entered fees to the financed amount.

For amortizing loans, the core payment formula is Payment = P × r × (1+r)^n ÷ ((1+r)^n − 1), where P is principal, r is the periodic interest rate and n is the number of payments.

Last reviewed: September 2026. Estimates are for educational and planning purposes only.

How to use the result

Change one assumption at a time to compare scenarios. For example, test a lower rate, larger contribution, different term or extra payment. This makes the calculator most useful as a decision-support tool rather than a single-number answer.

Important financial decisions can depend on taxes, fees, eligibility rules, lender policies, market returns and personal circumstances that this simplified calculator does not capture.

Frequently asked questions

Is this auto loan calculator free?

Yes. SumStride calculators are free to use and do not require an account.

Are the results exact?

No. Results are estimates based on the values you enter and the assumptions described on this page. Real-world fees, taxes, rates, policies and timing can differ.

Does SumStride save my inputs?

No account is required. The calculator runs in your browser; SumStride does not need your entered values to perform the calculation.