APR calculator

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Estimate APR from a loan amount, interest rate, term, and common fees. Shows your payment, total interest, and total paid.

USD
This is the amount you borrow before fees are added or subtracted.
%
This rate sets your payment. APR adds most fees (so APR is usually higher).
yr
USD
Example: points or origination fees paid at closing (money you do not get to keep).
USD
These increase the balance you repay. You usually do not receive this as cash.
USD
Example: a monthly servicing fee. If you pay monthly, this is per month.
Most loans are monthly. If you choose weekly or biweekly, this calculator approximates the payment schedule.
Compounding is how often interest is added to the balance (interest-on-interest).
Used only to show an estimated payoff month.
How to use APR calculator
  1. Enter the loan amount: This is the principal you borrow before fees.
  2. Enter the interest rate: This is the “note rate” used to calculate the base payment. APR usually ends up higher because it includes fees.
  3. Enter the loan term: How long you will repay the loan (in years).
  4. Open Advanced options (optional): Add fees (upfront, rolled into the loan, or per payment). Set payment and compounding frequency if your loan is not monthly.
  5. Optional start month: If you enter a start month, the calculator shows an estimated payoff month.
  6. Click Calculate: Review the APR, the payment amount, total paid, and the cost breakdown (principal, interest, fees). Use “More details” for the inputs used and the APR math note.
Tip: If you only want a quick APR estimate, leave Advanced options closed and enter just the loan amount, interest rate, and term.
Methodology and sources
This calculator estimates a US-style nominal annual APR for an equal-payment loan, including the fees entered. It also reports an effective annual rate separately.
Payment and fee calculation

The payment rate is i = (1 + r/m)^(m/p) – 1, using nominal note rate r, compounding periods m and payments per year p. The loan payment on principal plus financed fees is L*i/[1-(1+i)^(-n)], or L/n at zero interest. Add any fee per payment.

Find periodic cash-flow rate j such that the present value of those payments equals principal minus upfront fees. APR = 100*j*p. Effective annual rate = 100*((1+j)^p-1). For a fee-free 6% loan with monthly compounding and payments, APR is 6% and the effective annual rate is about 6.168%.

Assumes constant rates, equal payment intervals and entered fees included in the estimate. Weekly/biweekly schedules are approximations; actual disclosed APR depends on applicable fee definitions, dates and lending rules. This is not a lender disclosure calculation for irregular transactions.
CFPB Regulation Z Appendix J: closed-end APR calculations
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