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What formula can I use to calculate the interest on a loan?

Frequently asked questions about calculations and formulas

What is your interest?

Because the formula to calculate the interest is very complicated, we make our Excel calculation module available. This allows you to easily calculate the interest of a loan without having to delve into the formula. To use our formula to calculate the interest, you do need some information. These are the amount you have borrowed, the term and the monthly installment. If you enter this information, the formula calculates the interest and gives you a good indication of the interest you pay monthly and annually for your loan.

Calculate the interest on your loan immediately

If you want to calculate the interest on a personal loan, it is important that you enter the original loan amount and the original term. Do you want to calculate the interest of a revolving credit ? Then you can enter the current outstanding balance and the (theoretical) term of the revolving credit.



Select a product shape
Enter the original loan amount
Enter the outstanding balance
Enter the original term
Enter the current monthly installment
Enter your email address

After sending you will receive from us by e-mail

  • The result of the calculated interest.
  • Our top 5 interest rates for a loan of {{application.open | currency: "€": 0}}.
  • Free Excel calculation module containing the formula to calculate the interest.


Based on the data entered, the interest is {{currentInterest | number: 1}}% .

Our cheapest rate for a {{cheapestProduct}} of {{cheapestLoan.Loan Amount | currency: "€": 0}} is {{cheapestLoan.rente}} . You can immediately request a no-obligation quote for this.


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Of course, there are complicated formulas for calculating cumulative interest. However, the cumulative interest of revolving credit or a personal loan can also be calculated manually, without a complicated formula: Installment amount x (Theoretical) Duration = Total amount to be paid - / - loan amount = Cumulative interest.

Current interest rates

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