None of these pages does its own math. Each one sends your numbers to the same engine a Carlarity report runs on and shows you what came back — with every estimated line labelled as one.
Out-the-door price
Every line is computed by the same out-the-door engine as the report: the state tax table, the state's doc-fee rule, its title and registration formulas, and real loan amortization. This page does none of the math itself.
Open the out-the-door price calculatorFinanced cost of an add-on
The result is the same amortization the report uses for every financed line — the annuity payment on the amount, times the term, minus the amount — returned by the fee engine, never price × APR × years.
Open the financed cost of an add-on calculatorDoc fee check
The standing comes from the same doc-fee rule table the report evaluates a quote against — statute, cap and verification status per state. A state whose rule is not primary-sourced says so instead of guessing.
Open the doc fee check calculatorA calculator answers one line. The report answers the deal — price against the market, every fee and add-on classified, the loan, and what to say back.