Auto Loan Calculator

Vehicle payment, tax, down payment and interest.

Enter your values in the interactive calculator to see an instant result. Calculations run in your browser, without an account.

Results are estimates for educational use; confirm important decisions with appropriate experts.

Formula • Worked example • Interpretation

Estimate car loan payments and interest

An auto loan payment depends on the financed amount, rate and repayment term—not only the sticker price.

Calculation method

Amount financed ≈ purchase price + modeled sales tax − down payment. Monthly installment = P × r / (1 − (1+r)⁻ⁿ), where r is monthly APR and n is months.

Worked example

For a financed amount of $20,000 at 6% APR over 60 months, principal and interest are about $386.66 per month, before fees.

What your result means

Compare loan terms against the vehicle’s expected ownership period; stretching payments can mean paying interest for longer and owing more than a depreciating vehicle is worth.

Tips for better calculations

For real offers, compare the lender’s total amount financed and APR rather than advertising monthly payment alone.

Assumptions and limitations

Registration, title, trade-in taxes, dealer fees, rebates, sales-tax treatment, and add-on products vary by location and are not universally modeled.

SiCalcs tools provide estimates and educational calculations; they do not replace professional financial, medical, tax, or legal advice.