Mortgage Calculator
Plan your property purchase with LVR and deposit calculations.
Principal & Interest over 30 years
How to save on your mortgage
Small changes to your repayment strategy can save you thousands in interest.
Make extra principal payments
Even an extra $50 a week goes directly to reducing your principal, cutting years off your loan term.
Switch to fortnightly payments
Paying half your monthly amount every fortnight results in 26 payments (equivalent to 13 months) per year.
Choose a shorter loan tenure
A 25-year term instead of 30 years increases your regular payment slightly but drastically reduces total interest.
Pay lump sums when possible
Use tax refunds or bonuses to make lump sum payments. Check your fixed-term conditions for penalty-free limits.
Refinance when rates drop
Keep an eye on the market. Breaking a fixed term might incur a fee, but the lower rate could save you more overall.
Split your mortgage
Fix portions of your loan for different terms (1, 2, 3 years) to spread your interest rate risk over time.
How Kiwis use this mortgage calculator
Buying in Aotearoa usually means weighing deposit size, LVR rules, and whether repayments stay comfortable if rates move. Use this tool to estimate principal & interest repayments from price, deposit, rate, and term—then validate assumptions with a mortgage adviser or your bank.
Floating, fixed, and split structures all behave differently over time. The calculator helps you compare a baseline loan to split tranches and payment frequencies (weekly, fortnightly, or monthly) so you can discuss options with confidence.
- Compare NZ home loan offers — shortlist lenders before you apply.
- Salary after tax — sanity-check repayments against take-home pay.
- Budget planner — see what room you have after housing costs.
- Loan EMI calculator — model other debts on a similar repayment basis.