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Mortgage Amortisation Calculator

Our amortisation calculator breakdowns your monthly mortgage repayments into a simple, flexible, and printable amortisation report.
Updated 3 May 2026​
Our Calculator Makes The Numbers Clear:
  • When you take out a mortgage, it is amortised over a fixed number of years in equal installments. Part of each payment goes toward the loan principal, and part goes toward interest.
  • With mortgage amortisation, the amount going toward principal starts out small, and gradually grows larger month by month. Meanwhile, the amount going toward interest declines month by month for fixed-rate loans.
Our amortisation calculator shows exactly how much money you pay in principal and interest over time.

Simply insert:
  1. Your Loan Amount (current mortgage balance), and
  2. The Loan term (how many years your mortgage is for), and
  3. The Interest Rate you pay, and
  4. The First Payment date of your loan

Mortgage Amortisation Schedule

Monthly payment $0
Total interest $0
Total cost $0
Loan paid off --

Loan balance over time

Amortisation schedule

Schedule shows how each payment is split between principal and interest, with the running balance and cumulative interest paid. Standard NZ amortisation formula, monthly compounding. Real-world variations (rate changes at re-fixing, fee adjustments, overpayments) are not modelled.

Important: Our calculations are based on the assumption that you make the same fixed mortgage repayment for the entire repayment period, the interest rate does not increase or decrease, you don't miss any repayment deadlines, overpay or underpay. 

Ready to make your move? Our best mortgage rates guide has the latest home loan deals from the banks.
Video guidance: MoneyHub Founder Christopher Walsh explains how the calculator works in the video below:
Your Mortgage Amortisation Calculator is Brought to You by LifeDirect Mortgages
  • LifeDirect Mortgages, a trusted name in mortgage brokering across New Zealand, proudly supports this guide. We value LifeDirect Mortgages' commitment to helping New Zealanders secure the best home loan solutions, offering personalised advice tailored to your needs.
  • Whether you're a first-home buyer, looking to refinance, or exploring investment property options, LifeDirect Mortgages' experienced team makes the process simple, transparent, and stress-free. We proudly name them winners of our 2024 Editor's Choice for our favourite nationwide mortgage adviser.
  • We encourage you to contact their friendly experts to discuss your mortgage needs - you can learn more about LifeDirect Mortgages with our detailed review or visit their website.
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