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Mortgage Calculator

📅 Updated 24 April 2026·📊 Principal and interest or interest-only

Estimate mortgage repayments using a principal-and-interest or interest-only structure, then switch between monthly, fortnightly, and weekly repayments to see the effect on total interest and total cost.

A cleaner mortgage tool that keeps the familiar repayment layout in your own theme.

This page mirrors the structure in your reference while fitting Fynance's lighter design language. It is ideal for mortgage guides, lender explainer pages, and quick affordability examples.

  • Switch between principal-and-interest and interest-only repayments.
  • Adjust the mortgage amount, term, and interest rate with sliders.
  • Compare weekly, fortnightly, and monthly repayment schedules.

Mortgage Calculator

$500,000
30 years
7.00%
Mortgage Payment $3,327
Mortgage Amount $500,000
Total Interest $697,544
Total Cost $1,197,544

This estimate uses a principal-and-interest structure over 30 years at 7.00%, with monthly repayments.

Repayment structure

Principal-and-interest reduces the loan balance over time, while interest-only keeps the balance unchanged during the selected term.

Frequency comparison

Weekly and fortnightly repayments change the payment size because the total number of repayment periods changes.

Total cost clarity

Seeing the total interest beside the regular repayment helps readers understand the long-term trade-off of the rate and term they choose.

Why Use a Mortgage Calculator NZ?

Navigating home ownership in New Zealand is simpler when you know the numbers. Our fully-featured mortgage calculator NZ is designed to give you a complete overview of your potential home loan costs. Adjust your variables to see how changes in RBNZ cash rates or bank margins will impact your weekly or fortnightly household budget.