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Why use a loan amortisation calculator?
A loan amortisation calculator helps you understand exactly how a debt is repaid over time. Instead of seeing only one monthly number, you get a full breakdown of each payment: how much goes to interest, how much reduces principal, and what your remaining balance will be after every period.
This matters because two loans with the same balance can cost very different amounts in total interest. When you can see the schedule in detail, you can make smarter decisions about loan term, payment frequency, and extra repayments.
How amortisation works
1) Principal vs interest
In an amortising loan, each payment includes both interest and principal. Early in the schedule, more of each payment goes to interest. Later, a larger share goes toward principal. This shift happens automatically as your outstanding balance shrinks.
2) Fixed repayment formula
For fixed-rate loans, the base repayment is calculated so the balance reaches zero by the end of the chosen term. This calculator handles that automatically for monthly, fortnightly, weekly, and quarterly payments.
3) Extra repayments
Adding even a small extra amount each period can reduce both your payoff time and your total interest. Because interest is calculated on the outstanding balance, extra principal reductions early in the loan usually have the largest long-term impact.
How to use this calculator effectively
- Enter your current or planned loan amount.
- Use the annual interest rate from your loan offer or statement.
- Select a realistic loan term and payment frequency.
- Test different extra payment values to compare savings.
- Review the amortisation table to see payment-by-payment details.
What to look for in the results
Total interest paid
This is often the most important long-term cost metric. A lower interest total means more of your money stays with you instead of being paid to the lender.
Loan payoff date
The payoff date gives you a clear target. If you increase extra repayments, watch this date move earlier.
Interest savings from extra payments
The calculator compares a baseline schedule (no extra repayments) against your adjusted plan. This highlights exactly how much your strategy improves your outcome.
Practical repayment strategies
- Round up your payment: small consistent overpayments add up.
- Use income increases wisely: allocate part of raises or bonuses to principal.
- Switch to more frequent payments: in some cases this accelerates balance reduction.
- Avoid extending term unnecessarily: longer terms can mean significantly higher total interest.
Important assumptions
This tool assumes a fixed interest rate, regular payment timing, and no fees or penalties. Real loans may include offset accounts, redraw features, annual fees, changing rates, or lender-specific rules that alter exact outcomes.
Treat this calculator as a planning guide. For final decisions, verify numbers with your lender or a qualified financial professional.