The following New Zealand mortgage calculators are most relevant to someone looking to invest in New Zealand. They will help you to in understanding you personal financial commitment in investing in New Zealand.
This will help you determine home much principle and interest you will pay on your home loan and the impact of any extra repayments. Loan calculator
This calculator will help you understand your monthly mortgage repayment commitments, and if you wish to make extra repayments it will help you determine how many years it will take you to pay off your mortgage. Mortgage Payoff Calculator
A fixed rate mortgage has the same payment for the entire fixed period of the loan. Use this calculator to compare a fixed rate mortgage principle / interest vs. Interest Only Mortgage commitments. Principle and Interest vs Interest Only Mortgage