Mortgage Repayment Calculator

Explore repayments and extra-payment scenarios

Estimate your regular repayments

Use this mortgage repayment calculator to explore how a loan amount, interest rate and term affect the payment estimate. Choose principal and interest or interest only, then select weekly, fortnightly or monthly payments.

These are illustrative estimates, not a lending offer, an affordability assessment or personalised financial advice. Replace the starting figures with your own scenario. The rates shown when the tools open are example inputs, not a current lender quote.

Enter the amount to be borrowed or the balance still owing, rather than the property price. For an existing loan, start with its remaining term. Change one input at a time so the comparison stays clear.

After editing, click or tab out of each field and check the value shown. Blank or invalid entries can leave an earlier result on screen, and out-of-range values may be adjusted. If anything looks wrong, reload the page and enter the scenario again.

Explore extra repayments and loan term

The second tool compares the projected balance with and without an extra contribution each payment. Enter the loan amount, term, interest rate, repayment frequency and extra amount to see its estimated interest and time savings.

The extra contribution is per payment, so check the frequency before comparing scenarios. The tool does not check whether your lender permits the extra payment or whether a charge would apply.

Understand the assumptions and limits

One rate for the scenario. The tools use the rate you enter. They do not forecast future rate changes or model a sequence of different fixed-rate periods.
Rounded estimates. The repayment tool rounds amounts to whole dollars within its calculation, which can affect the totals shown. Actual lender calculations and payment dates may produce different amounts.
Costs need a separate budget. These tools have no fields for lender fees, early repayment charges, legal costs, rates, insurance, maintenance or household expenses. Allow for these separately.
Interest only leaves principal to repay. An interest-only payment does not pay off the amount borrowed. The repayment tool’s “Total Cost” includes the original loan amount; it does not mean the displayed interest-only payments clear that balance.

Use the results as a starting point for questions. Confirm actual repayment amounts, fees, loan conditions and any proposed changes with the lender before relying on them.

Questions about using the calculators

Does the result tell me how much I can borrow?

No. These tools do not assess your income, spending, other debts, deposit, credit history or the property. A lender still needs to assess the application. I can help you look at your wider position before you rely on a borrowing figure.

How should I compare repayment frequencies?

Select each frequency in the tool and keep the loan amount, rate and term consistent. Do not assume a weekly or fortnightly payment is simply a monthly payment divided up. Ask your lender to confirm the payment amount and schedule available for your loan.

Can I make the extra repayments shown?

Check your loan agreement first. Fixed-rate loans can have limits or early repayment charges. The tool’s estimated interest saving does not deduct a lender-specific charge, and it does not confirm that changing your payments is suitable for you.

Put the numbers in context

I’m Eddie Biesenbach. I can help you compare a repayment estimate with your budget, plans and loan options. If you are buying your first home, start with my first-home buyer service. If you are reviewing an existing mortgage, see refixing and refinancing.

Read about my mortgage advice in Tauranga, or contact me to discuss your figures.

Led by Eddie Biesenbach, Best Mortgages brings 20+ years of experience directly to your door. We help Tauranga & Bay of Plenty locals—from First Home Buyers to Self-Employed Investors—work through their home loan options without the bank queues

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Head Office: 12 Bay Street, Matua, Tauranga 3110

Tauranga-based mortgage broker helping clients across New Zealand through online meetings.

Ewald (Eddie) Biesenbach (FSP 320426) provides financial advice through The Best Limited trading as Best Mortgages (FSP 724451, NZBN 9429043352067). The Best Limited holds a Financial Advice Provider licence issued by the Financial Markets Authority.