Home Loan Calculator

Our calculator uses the same methods as banks, covering standard to complex loans.

Disclaimer: Information provided by this calculator is an estimate only and is not an offer of finance. Actual rates, fees, and repayment amounts may vary and depend on your specific situation, chosen lender, and market conditions. Calculations assume interest is charged at the specified frequency and do not account for daily compounding variations, leap years, or lender-specific fee structures. Please speak to your Home Loan Factory adviser for a personalized quote.
Home Loan Factory Mortgage Calculator
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The total amount you plan to spend on buying the property.
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The amount of cash or equity you are putting towards the purchase. A deposit of 20% or more usually avoids extra low-equity bank fees.
20% Deposit
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The overall timeframe to pay off the loan (standard is 30 years).
YEARS
MONTHS
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How long your interest rate is locked in for. This is purely for your reference in the exported chart.
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How often you make a mortgage payment. Aligning this with your payday makes budgeting much easier!
Loan Structure
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Assign different terms, rates, and frequencies to each split.
Offset / Revolving Buffer

Enter the average daily balance kept in your linked accounts. The calculator will automatically apply this cash to reduce the interest charged on your eligible splits above.

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Total Loan Balance: $0
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Sets the frequency for your combined results and extra payments below.
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Adding estimated local council rates and house insurance gives you a highly realistic view of the 'true cost' of homeownership.
Rates
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Insurance
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/ week
Repayment
$0
Includes Rates & Ins.
Phase 1: Interest Only
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Includes Rates & Ins.
For 2 Years
Phase 2: Principal & Interest
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Includes Rates & Ins.
Remaining Term
Save 0 Years
Pay It Off Faster
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Target repayment / week
Note on Revolving Credits: A standard Revolving Credit only requires interest to be paid, meaning the principal balance will not naturally decrease over time unless you make extra payments. A 'Reducing' facility automatically drops its limit by a fixed principal amount each month to ensure the debt is cleared.
Ready to apply?
Repayment
$0
Category
First Home Buyers
Refinancing
Budgeting
Information

1. The Simple Setup (For quick estimates)

  • Choose your goal: Select either "Buying a Property" or "Already Own My Home".
  • Enter the basics: Drop in your purchase price and deposit (or total loan balance), your term, and current interest rate.
  • See your costs: The calculator will instantly show your required repayments. Use the "Rates & Insurance Tool" to get a true picture of your actual weekly household costs.
  • Pay it off faster: Slide the "Increased Repayment" tracker to instantly see how much interest you can save, and exactly how many years you can slash off your loan term by paying a little extra.

2. The Advanced Setup (For split loans and smart structuring)

Are you mixing fixed rates with floating? Using an offset account? Click the Advanced (Split Loans) button to unlock professional-grade structuring:

  • Click "+ Add Loan Split" to break your total loan into multiple chunks (e.g., $400k Fixed, $100k Revolving Credit).
  • Assign specific interest rates, repayment types (P&I, Interest-Only, Revolving Credit, or Offset), and varying loan terms to each individual split.
  • Once your splits match your total loan amount, the calculator will blend them into a single, easy-to-read "Combined Repayment."

Pro Tip: Export Your Plan

Once you've built your perfect structure, click "Copy Loan Chart." This instantly copies a beautifully formatted table of your exact loan splits directly to your clipboard. You can paste it straight into an email to us, or save it to your own notes!

Talk to an expert
FAQS

Frequently Asked Questions (Home Loan Structuring)

How do I pay off my mortgage faster?

One of the most effective ways to pay off a mortgage faster is by making extra principal payments above your bank's minimum requirement. Even an extra $50 a week can shave years off your loan. If you have a "Split Loan", you can use the Avalanche Method: direct all of your extra cash toward the loan split with the highest interest rate first, while paying the minimums on the rest. Our calculator does this math for you automatically!

What is the difference between Revolving Credit and an Offset Mortgage?

Both are designed to reduce the amount of interest you pay, but they work differently:

  • Revolving Credit: This acts like a giant overdraft on your transaction account. Your income goes straight into the loan, reducing the balance and the interest calculated daily. You can dip back into the funds up to your limit as needed.
  • Offset Mortgage: Your loan and your savings remain in separate accounts, but the bank "offsets" your savings against your loan balance before calculating interest. If you have a $100,000 loan and $20,000 in a linked savings account, you only pay interest on $80,000.
Can I make extra repayments on an Interest-Only loan?

Generally, banks do not allow you to make extra principal payments during an active Interest-Only (IO) period. If you have extra cash to apply, you must either direct it toward a standard Principal & Interest (P&I) loan split, or put it into a savings/offset account to prepare for when your IO period ends.

Are local council rates and house insurance included in my mortgage?

No, your bank repayment only covers your loan principal and interest. However, council rates and house insurance are mandatory ongoing costs of property ownership in New Zealand. Our calculator includes a Rates & Insurance Estimate Tool so you can see the "True Cost" of your housing commitment, preventing you from over-stretching your household budget.

Expert advice for your home loan, KiwiSaver, and beyond.