How it works
Start with the loan proceeds you can actually use, before any upfront finance charges. Then enter the fees you want treated as finance charges, split by whether you pay them upfront or roll them into the loan. Financed charges make the balance (and the payment) bigger. Upfront charges shrink the money you really receive. A vehicle down payment isn't a finance charge here.
The calculator then finds the monthly rate at which your net proceeds equal the stream of equal monthly payments, with the first payment one month after the loan starts. Multiply that monthly rate by 12 and you get the nominal annual estimate. Compound it over 12 months and you get the effective annual rate. They're two ways of annualizing the same monthly rate, so don't use them interchangeably.
The formula behind the estimate
Every result starts with a defined model and visible assumptions.
Gross balance = useful loan proceeds + financed finance charges Net proceeds = useful loan proceeds − upfront finance charges Payment = standard annuity payment on gross balance at contract rate Find monthly i such that net proceeds = Σ payment / (1 + i)^month Nominal APR estimate = i × 12 × 100 Effective annual rate = [(1 + i)^12 − 1] × 100
A worked example
Say you receive 12,000, the contract rate is 0%, and the term is 12 months. If 120 of finance charges are rolled into the loan, the balance becomes 12,120 and the payment 1,010. You still only received 12,000, so the nominal APR estimate is about 1.8410%, even though the contract interest rate is 0%. The numbers are made up for illustration and work in any supported currency.
Why can APR be higher than the interest rate?
The contract rate decides how much interest builds up on the balance you owe. APR also reflects the credit charges you include, so a loan with a low advertised rate can still cost more overall when fees are significant. The comparison table takes the entered finance charges away to show that gap at the same proceeds, rate and term.
Which fees belong in the calculation?
That depends on the country and the type of deal. Include only the amounts you mean to treat as finance costs, and ask the lender for an itemized list. Taxes, insurance, optional add-ons, cash-sale costs and third-party charges don't all get the same APR treatment, and picking a currency doesn't settle the question. This tool is a regular-payment estimate, not a legal fee-classification engine.
Do payment dates and rounding matter?
A little. The yield calculation uses equal, unrounded payments, while real schedules round each payment and adjust the last one. Odd first periods, deferred payments, irregular dates, balloons, variable rates and multiple advances all need a different cash-flow setup. The lender's official disclosure is what governs your deal; for standard monthly payment scenarios, the car loan and refinance calculators are the better fit.
Questions worth asking
Why can APR be higher than the interest rate?
Because APR counts finance charges as well as interest. Fees can enlarge the balance you repay or shrink the money you actually receive, and the cash-flow rate reflects both effects.
What's the difference between nominal and effective annual rates?
The nominal estimate is simply 12 times the monthly rate. The effective annual rate compounds the monthly rate over 12 months, so it comes out slightly higher. The tool labels the two separately.
Can I enter the advertised APR as the contract rate?
No, enter the underlying interest rate. If you use a fee-inclusive APR and also add the same fees, their effect gets counted twice.
Is this a legal APR disclosure for every country?
No. It assumes equal monthly periods and finance charges that you classify yourself. Local definitions of fees, timing rules and disclosure requirements can differ.
Does this work with a 0% interest rate?
Yes. With no finance charges the result is zero. If you add upfront or financed credit charges, even a 0% loan produces a positive APR estimate.
This is general information, not personalized financial advice. Read the limitations.
