Mortgage Repayment Calculator

  • Enter the loan amount, interest rate, and loan term.
  • Optionally, you can enter an extra monthly payment to see the effect.
  • Click "Calculate Repayment" to get the loan summary.
  • Click "Clear Results" to reset the results.
  • Click "Copy Results" to copy the results to the clipboard.

A Mortgage Repayment Calculator is a vital tool designed to assist individuals and financial advisors in comprehending and planning the repayment of a mortgage. This digital or physical calculator inputs various factors such as loan amount, interest rate, and the loan term to calculate the monthly payments, the total payment over the life of the loan, and the total interest paid.

Concept of Mortgage Repayment

Understanding Mortgages

A mortgage is a type of loan used for buying or maintaining real estate. The borrower agrees to pay back the loan over a set period, 15 to 30 years, along with interest, in a series of regular payments.

Components of Mortgage Repayment

  1. Principal: The original amount borrowed.
  2. Interest: The cost of borrowing the principal amount, expressed as a percentage.
  3. Loan Term: The duration over which the loan must be repaid.

Mathematics Behind Mortgage Repayment

Basic Formulae

The core formula for calculating the monthly mortgage payment (M) is derived from the annuity formula and is as follows:

M = P[r(1+r)^n] / [(1+r)^n – 1]


  • M is the total monthly mortgage payment.
  • P is the principal loan amount.
  • r is the monthly interest rate (annual interest rate divided by 12).
  • n is the number of payments (loan term in years multiplied by 12).

Factors Affecting Mortgage Repayment

  1. Interest Rate: A higher interest rate increases the monthly payments and the total cost of the loan.
  2. Loan Term: A longer loan term reduces monthly payments but increases the total interest paid over the life of the loan.
  3. Principal: The larger the loan amount, the higher the monthly payments.

Benefits of Mortgage Repayment Calculator

Financial Planning

Mortgage calculators aid in financial planning by providing a clear picture of the monthly payments and the feasibility of the loan.

Comparing Loan Offers

They allow borrowers to compare different mortgage offers, understanding how changes in terms, rates, and principal affect payments.

Determining Affordability

Calculators help in determining the price range of a property one can afford, preventing overborrowing.

Amortization Schedule

Some advanced calculators provide an amortization schedule, showing how much of each payment goes towards the principal vs. interest over the life of the loan.

Facts About Mortgage Repayment Calculators

  1. Early Use: Mortgage calculators have been around since the early days of personal computers, evolving from simple programs into sophisticated tools offering detailed analyses.
  2. Impact of Extra Payments: They can show the impact of making extra payments on the principal and how it reduces the total interest and loan term.
  3. Tax Benefits Calculation: Some calculators also take into account potential tax benefits related to mortgage interest payments.


Mortgage Repayment Calculators are indispensable tools in the real estate and finance sectors. They provide a clear understanding of mortgage mechanics, aiding in making informed decisions. With the evolution of technology, these calculators have become more sophisticated, offering detailed insights into loan dynamics.

  1. Understanding the Time Value of Money: This concept is fundamental to mortgage calculations and is well articulated in financial textbooks and journals.
  2. Real Estate Finance Texts: These include chapters dedicated to mortgage calculations, providing detailed theoretical and practical insights.
  3. Online Financial Resources: Many financial websites and online courses offer in-depth tutorials on using and understanding mortgage repayment calculators.

Last Updated : 13 February, 2024

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