NAB Mortgage Repayment Calculator (AUD)
Estimate your home loan repayments, total interest, and payoff timeline.
This is an educational estimate only and is not affiliated with or endorsed by NAB. Actual repayments can vary due to fees, product type, rate changes, and lender policy.
How to use this NAB mortgage calculator
If you are planning to buy property in Australia, a mortgage calculator helps you understand cash flow before you apply for a loan. This calculator estimates repayments using a standard principal-and-interest formula and can show how extra repayments may reduce your total interest and loan length.
To get started, enter your loan amount, annual interest rate, loan term, and repayment frequency. You can also add an extra repayment amount. After you click Calculate Repayments, the tool shows your estimated repayment per period, total interest paid, and an indicative payoff date.
What this calculator includes
- Principal and interest repayment estimate
- Monthly, fortnightly, or weekly repayment frequency
- Optional extra repayments each period
- Total repayment and total interest estimate
- Estimated payoff date based on current assumptions
Why repayment frequency matters
In Australia, borrowers often compare monthly and fortnightly repayment options. A fortnightly cycle can help some households align repayments with pay cycles. In practice, the total impact depends on how the lender applies interest and schedules repayment processing. Always confirm the exact method in your home loan contract.
Monthly repayments
Common for budgeting and often easiest to compare across lenders. Good for borrowers who manage monthly salary and bill cycles.
Fortnightly and weekly repayments
These can improve repayment discipline and may reduce interest over time, especially when total annual paid amount is effectively higher than a strict monthly approach. Small recurring extras can create meaningful long-term savings.
Understanding the key mortgage inputs
1) Loan amount
This is the amount borrowed after your deposit. For example, if a property costs $850,000 and you provide a $200,000 deposit, the loan amount is $650,000 (excluding costs such as stamp duty, legal fees, and lender fees).
2) Interest rate
Even small changes in rate can make a large difference over 25 to 30 years. A 0.50% rate movement can significantly shift your monthly repayment and lifetime interest.
3) Loan term
Longer terms reduce each repayment but generally increase total interest. Shorter terms increase each repayment but reduce total interest and help you own your property sooner.
4) Extra repayments
Adding even a modest extra amount each period can shorten your loan life and lower interest paid. Consistency is usually more powerful than occasional large payments.
Example scenario
Suppose you borrow $650,000 over 30 years at 6.29% p.a. with monthly repayments. The calculator gives an estimated base repayment. If you then add an extra $200 per month, you can compare both outcomes and see how many years of repayments you may save, plus the potential interest reduction.
Before applying for a home loan
- Check your true borrowing costs: fees, offset account costs, and package fees.
- Review your loan-to-value ratio (LVR) and potential lenders mortgage insurance (LMI).
- Stress test at a higher rate (for example +1% to +2%).
- Include property ownership costs: council rates, maintenance, insurance, strata (if applicable).
- Compare fixed, variable, and split loan structures based on your risk tolerance.
Important reminder
This NAB mortgage calculator is designed for education and planning. It is not personal financial advice. For decisions about borrowing capacity, loan product choice, and refinancing strategy, speak with a qualified mortgage broker, lender specialist, or licensed financial adviser.