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Mortgage Calculator

Calculate your mortgage repayment


How to calculate a mortgage?

Calculating a mortgage is an essential part of planning the purchase of a home. A mortgage is a loan taken out to buy a house or other real estate. The loan is repaid over a set term, with interest.

Key factors in calculating a mortgage

  • Loan amount: This is the amount you borrow from the bank or another lender to buy the property. Your loan amount will depend on the price of the property you want to buy and the amount you contribute yourself (your own contribution or "down payment").
  • Interest rate: The interest rate is the percentage of the borrowed amount that you pay annually to the lender for the use of the borrowed money. Interest rates can be fixed or variable. A fixed interest rate does not change during the term of the loan, while a variable interest rate can rise or fall depending on market conditions.
  • Loan term: This is the period over which you agree to repay the loan. The term can vary from a few years to 30 years or more, depending on what you have agreed with your lender. The length of your term will affect both your monthly payments and the total amount of interest you pay over the term of the loan.

How to calculate the monthly payment of a mortgage

A basic formula to calculate the monthly payment of a mortgage is as follows:

        M = P[r(1+r)^n]/[(1+r)^n – 1]


  • M = monthly payment
  • P = principal (the borrowed amount)
  • r = monthly interest rate (annual interest rate / 12)
  • n = number of months you borrow the money

It's important to remember that your mortgage payments consist of two parts: the amount that goes towards paying off the loan itself (the principal) and the amount that goes towards the interest on the loan.

Calculating a mortgage is a complex process and it's important to consider seeking professional financial advice before taking out a loan. There are also various online tools and calculators available that can help you gain a better understanding of how mortgage payments are calculated.

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