Don't just calculate your mortgage. Play with the future.
Change your rate. Add an offset. Find another $50 a week. Stress-test a rate rise. Pick the age you want the mortgage gone. See what each decision could mean in dollars, years and an actual mortgage-free date.
Your loan, your levers
Build your mortgage scenario
Start with the loan as it stands today, then change one thing at a time. The forecast on the right updates instantly.
The baseline uses the same loan balance, rate and remaining term without an offset or extra repayments, so you can see what your changes are doing.
What if I save a little more?
Have a proper play
Three useful questions most mortgage calculators make too hard
These controls all feed the same mortgage model above.
What if rates move?
Stress-test the same loan without re-entering everything.
How hard is my offset working?
See the approximate interest benefit created by the offset balance used in this scenario.
Give me years back
Pick how many years you would love to knock off. We'll estimate the extra monthly repayment needed.
Make the maths human
Your mortgage timeline
A home loan is easier to understand as a journey than as 300 rows of amortisation data.
What this calculator is actually doing
It creates a baseline mortgage, then runs your chosen scenario against it month by month.
- Your rate is entered by you — no teaser rate is forced into the calculation.
- Offset money reduces the balance used to estimate interest, without pretending the offset itself has repaid the loan.
- Regular offset contributions can grow the offset over time.
- Extra repayments reduce the principal and can bring the mortgage-free date forward.
- The comparison shows both estimated interest saved and time saved.
- Property value is only used to show a simple LVR indicator; it does not affect repayment maths.
See what the percentage changes
What does a different deposit do?
Same property price, four different deposit targets. This makes the relationship between deposit size, estimated loan and LVR easy to see.
Plan the whole cash target
The deposit is only one part of getting ready to buy
The Mortgage Lab keeps these numbers separate so you can see exactly what you are aiming for.
What this mode calculates
- Your chosen deposit percentage in dollars
- The resulting estimated loan amount
- The simple loan-to-value ratio (LVR)
- Your remaining savings gap
- An estimated date based on regular savings
- The effect of finding an extra $25, $50, $100 or $200 each week
What stays separate on purpose
- Stamp duty and state-based concessions unless you enter an allowance
- First-home buyer grants or guarantee schemes
- Lenders mortgage insurance and lender-specific pricing
- Savings-account interest or investment returns
- Eligibility, borrowing capacity and credit assessment
- Property valuation differences and lender policy
A mortgage calculator should answer the question behind the question.
If you've found a scenario you like, a broker can help test whether the rate, product structure, offset features and refinancing costs behind it actually stack up for you.
General information only. This calculator provides estimates based on the figures you enter and simplified monthly loan modelling. Actual lender repayments, interest calculations, fees, offset rules, redraw rules, fixed-rate restrictions, repayment timing, interest-only periods and loan terms can differ. Results are not a quote, credit assessment, recommendation or guarantee of savings. Check actual product terms and obtain advice appropriate to your circumstances before making financial decisions.