NZ mortgage calculator · 2026/27
Estimates from a standard repayment formula and rates you can edit.
Built for New Zealand.
Rates current as at 24 July 2026.
Loan of $640,000 · 80.0% LVR
An indicative fixed rate, not a lender quote. Change it to your own.
Extra payments, lump sum, offset, interest-only and stress rate.
On top of the contractual repayment.
Interest is charged on your loan minus this balance.
A buffer banks test you against. Not a forecast.
Repayment per fortnight
$1,676.35
on $640,000 at 5.50% · 30 years
Where $1,307,554 goes over the loan
Increasing your deposit by $20,000 could save $20,861 in interest.
Repayment at nearby terms
Same loan and rate, no extras — a shorter term raises the repayment and usually cuts lifetime interest.
Journey to mortgage-free
Remaining balance at each stop on your current schedule.
This calculator turns a loan amount, interest rate and term into the repayment you would make each week, fortnight or month, and the total interest over the life of the loan. Enter a purchase price and deposit, or the loan directly, and it works out the rest.
Worked examples
Both are an $800,000 home at 5.50% over 30 years, fortnightly — the deposit is the only change.
20% deposit
$1,676.35
repayment a fortnight · 80% LVR
A 20% deposit keeps the loan at 80% LVR — standard lending, not high-LVR.
10% deposit
$1,885.89
repayment a fortnight · 90% LVR
A 10% deposit is high-LVR — the bigger loan adds $83,444 of interest over the term.
Short answers on repayments, offset, stress tests and LVR — the rules behind the estimate.
Want the full detail?
Figures depend on the rate and terms you enter. Lenders set their own offers and conditions — the guides walk through how each lever changes the result.