Calculator

Mortgage repayment

See your regular repayment, the total interest over the loan, and how a rate change moves the numbers. Inputs stay on your device — nothing is sent anywhere.

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Weekly
Fortnightly
Monthly

Total cost shown includes principal plus interest over the full term. Does not include fees, rates or insurance.

Estimated weekly repayment
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Total paid
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Total interest
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of the total paid
Payoff date
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if you start now
How the rate moves it
RateRepayment
Common questions

Mortgage repayment questions, answered

How much is the repayment on a $500,000 home loan in New Zealand?

At a 6.5% interest rate over 30 years, a $500,000 mortgage costs about $3,160 per month, $728 per week, or $1,458 per fortnight. The exact figure depends on your rate, term and how often you repay.

How do I calculate mortgage repayments?

The repayment is worked out with the amortisation formula: payment = P × r(1+r)^n / ((1+r)^n − 1), where P is the loan amount, r is the interest rate per period, and n is the total number of payments. This page runs that formula for your numbers.

Weekly or fortnightly for NZ mortgages?

New Zealand mortgages are typically repaid weekly (52 payments a year), fortnightly (26) or monthly (12). The interest rate is divided by the matching number of periods per year. Repaying more often, at the same rate, chips away at principal faster and cuts total interest.

Does this calculator include fees and rates?

No. It covers principal and interest only. Loan establishment fees, mortgage insurance, rates and home insurance are separate costs and should be added on top.