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APR Calculator

Calculate the true Annual Percentage Rate (APR) of a loan. Include lender fees, closing costs, and interest rates to reveal the true cost of credit.

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Interactive APR Calculator Workspace

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True Cost Of Borrowing Summary

True Loan APR6.287% APReffective annual rate
Stated Interest Rate6%nominal rate
Monthly Payment$899.33regular installment
Total Borrow Cost$178,257.28interest + loan fees

Mathematical Formula & Variables

Equation ModelAPR = [((Fees + Interest) / Principal) / Term in Days] * 365 * 100

The Annual Percentage Rate (APR) formula converts interest charges and fees into a simple standardized yearly percentage representing the true cost of borrowing.

Variable Definitions

SymbolDescription
APRAnnual Percentage Rate
PrincipalLoan base amount borrowed
InterestTotal interest paid over the term
FeesLender fees, origination charges, and other points
Term in DaysTotal loan lifespan represented in days

How to Use the APR Calculator

  • Enter the Loan Principal or amount borrowed.
  • Specify the Interest Rate (nominal annual percentage rate).
  • Input the Loan Term in years or months.
  • Enter any additional fees (e.g., origination fees, documentation fees).
  • Calculate to reveal your true APR and monthly payment.

Practical Example Calculation

Scenario Context: Calculating the APR on a $100,000 mortgage loan for 30 years with a 6% interest rate and $3,000 in closing fees.

Step 1: Identify values: Principal = $100,000, Interest Rate = 6%, Term = 30 years, Fees = $3,000.
Step 2: Net amount received: $100,000 - $3,000 = $97,000.
Step 3: Calculate standard monthly payment (M) on $100,000 principal: $599.55.
Step 4: Determine the interest rate (r) that satisfies: $599.55 = $97,000 * [r(1+r)^360] / [(1+r)^360 - 1].
Step 5: Solve for APR (by iterating): APR equals approximately 6.31%.
The true Annual Percentage Rate (APR) of the loan is 6.31%, which is higher than the nominal rate of 6% due to upfront fees.

Frequently Asked Questions

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