Mortgage Repayment Calculator
- Ryan Smith
- Sep 5
- 2 min read
See exactly how much your loan will cost you using our mortgage repayment calculator.
Before you commit to a property or investment, you’ve got to understand what you’ll actually be paying.
Can your budget handle the repayments?
How do different interest rates or terms change your cashflow?
Our Mortgage Repayment Calculator gives you clarity in minutes, empowering you to plan smarter and invest with confidence.
What This Calculator Does
This easy-to-use tool estimates your monthly mortgage cost by allowing you to input and adjust key variables such as:
Loan amount – what you intend to borrow
Interest rate – current or projected rate
Loan term – the length of time to repay
From there, it calculates your monthly principal and interest, and interest-only payments, giving you a clear, no-surprise estimate grounded in NZ-specific data.
This isn’t a guessing game - it’s your numbers, your choices, crystal clear.
Why This Matters for Investors
Knowing your likely mortgage repayment upfront helps you:
Avoid overcommitting to a loan that strains your finances
Compare loan options side-by-side - like fixed vs floating or different term lengths
Forecast your cashflow more accurately, under all sorts of interest rate scenarios
Make sure your investment projections aren’t built on unstable debt assumptions
Try the Calculator Now
Want to know what your monthly payments will look like at different rates or loan terms? Let’s solve that now by clicking on the image below.
Related Tools
If you’re looking for other ways to analyse your investments, you might also like:
Learn How Much You Can Invest – work out your investment budget using our property investment calculator
Property Investment Returns - calculate the returns of any investment property using our calculator
How Does The Mortgage Repayments Calculator Work?
Enter the amount you plan to borrow, the interest rate, and the term length. The tool then calculates your monthly payments broken down into principal & interest, and interest-only.
Can I Test Different Scenarios?
Absolutely. You can adjust interest rates and loan terms to simulate how changes affect your repayments and cashflow over time.
Should I Consider Interest-Only, or Stick To Principal & Interest?
That depends on your specific circumstances. Read more about the difference here and what we normally recommend for investors.
Are The Results Guaranteed?
No. These figures are estimates based on your inputs and typical NZ loan structures. Your actual repayments depend on the lender, interest rate changes, and specific loan terms. For precision tailored to your situation, talk to a Thrive Investment Partners advisor.
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