Loan Repayment Calculator
Calculate monthly repayment, total interest, and amortisation schedule
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About Loan Repayment Calculator
Take Control of Your Debt with Clear Numbers
Taking out a loan is one of the most significant financial decisions you will ever make, yet many borrowers sign on the dotted line without fully understanding what they are committing to. How much will your monthly payment be? How much total interest will you pay over the life of the loan? What happens if you pay a little extra each month? The Loan Repayment Calculator answers all of these questions and more, giving you the financial clarity you need before you borrow.
Whether you are considering a mortgage, a car loan, a personal loan, or a student loan, the underlying mathematics are the same. This tool computes your monthly repayment amount, breaks down exactly how much of each payment goes toward principal versus interest, and generates a complete amortisation schedule that shows you the state of your loan at every point in its life.
Understanding Monthly Repayments
Your monthly repayment depends on three factors: the loan amount, commonly called the principal, the annual interest rate, and the loan term in months or years. The calculator uses the standard amortisation formula to determine a fixed monthly payment that will fully retire the loan by the end of the term. This means every monthly payment is the same amount, but the proportion that goes toward interest versus principal changes over time.
In the early months of a loan, the majority of your payment covers interest because the outstanding balance is still high. As the balance decreases, more of each payment goes toward reducing the principal. By the final months, almost all of your payment is principal reduction with very little interest. This phenomenon is why extra payments early in the loan term save far more in total interest than extra payments later on.
The Full Amortisation Schedule
The amortisation schedule is where this loan repayment calculator really shines. It produces a month-by-month table showing the payment number, the payment amount, the interest portion, the principal portion, and the remaining balance after each payment. You can scroll through the entire life of your loan and see exactly where every dollar goes.
This level of detail is incredibly useful when negotiating with lenders, comparing loan offers, or deciding whether to refinance an existing loan. If you are two years into a thirty-year mortgage and considering refinancing at a lower rate, the amortisation schedule tells you exactly how much principal you have paid off and how much you still owe, helping you calculate whether the refinancing costs are worth the interest savings.
Comparing Loan Offers Side by Side
When you are shopping for a loan, different lenders may offer different combinations of interest rate and term length. A lower rate with a shorter term gives you the smallest total interest cost but the highest monthly payment. A longer term lowers the monthly burden but dramatically increases the total interest paid. This calculator lets you run multiple scenarios quickly so you can find the combination that best fits your monthly budget and your tolerance for total interest cost.
For example, the difference between a 5-year and a 7-year car loan at the same rate might seem like just a few dollars per month, but the total interest difference over the life of the loan can amount to thousands of dollars. Seeing these numbers spelled out makes the tradeoff tangible rather than abstract.
The Impact of Extra Payments
One of the most powerful features is the ability to model additional monthly payments. Adding even a small extra amount to your monthly payment can shave years off your loan and save you a substantial sum in interest. The calculator shows you exactly how much time and money you save with each extra dollar, which is often the motivation people need to commit to paying a little more each month.
Completely Free and Private
Every calculation happens locally in your browser. Your loan amount, income, and financial details are never sent to any server, never stored in any database, and never shared with any third party. Unlike loan calculators on bank websites that are designed to funnel you toward their products, this tool has no agenda other than giving you accurate numbers. Use it as many times as you need, compare as many scenarios as you want, and make your borrowing decisions with full confidence in the math.