Buy Calculator

Interest Rate


Online calculator for calculating interest rates on a loan product using the David Cantrell Approximate Solution method. The loan interest rate is calculated on the basis of the loan amount, monthly payment and loan term.

Calculator of Loan interest rate

Initial amount
Payment amount
Number of years
Please, Enter all values correctly.
Interest rate

Formula  of Interest rate


i ≈ [ ( 1 + ( P/A ) ) 1/q– 1 ] q – 1

  • q = log[ 1 + (1/N) ] / log2;
  • N = n * 12;
  • P = Payment Amount;
  • A = Initial Amount;
  • N = Number of Payments

Leave a Reply 0

Your email address will not be published. Required fields are marked *