Home Loan Calculators Australia — Free Tools to Plan Your Mortgage
The average new owner-occupier loan is $736,257 — a commitment that will cost more in interest than most people earn in a decade if you don't engage with the numbers. LoanGorilla has built 15 free home loan calculators for the Australian market — no sign-up, no credit check, no nonsense. The RBA cash rate is currently 4.35% (effective 6 May 2026) — all calculators are updated for current rates.
Compare home loans with LoanGorilla — 100+ lenders. See real rates. Real repayments. No hard credit pull.
Compare NowTL;DR — The right calculator for your situation
About to buy for the first time? Start with Borrowing Power → then Stamp Duty → then LMI → then Home Buying Costs.
Already have a loan? Use Extra Repayments or Offset Savings to find money you're leaving on the table.
Thinking about refinancing? The Refinance Calculator shows your break-even and potential savings.
Not sure what rate means? The Comparison Rate Calculator explains why 5.49% and 5.24% can both be "the rate" on the same product.
Worried about rate moves? The Rate Change Stress Test Calculator shows the dollar impact at +1%, +2% and +3%.
All 18 standalone calculators at a glance
| Calculator | Best used for | Link |
|---|---|---|
| Borrowing Power Calculator | Estimate your realistic borrowing ceiling based on income, expenses and current rates. | Open → |
| Home Loan Deposit Calculator | Work out the deposit you need at 5%, 10% or 20% LVR — and how long to save it. | Open → |
| LVR Calculator | See your loan-to-value ratio and what it means for your rate, LMI and lender options. | Open → |
| Stamp Duty Calculator | Calculate transfer duty by state including first home buyer concessions. | Open → |
| LMI Calculator | Estimate Lenders Mortgage Insurance and whether to capitalise it into the loan. | Open → |
| Home Buying Costs Calculator | Total all upfront costs — stamp duty, conveyancing, inspections, fees and moving. | Open → |
| Home Loan Repayment Calculator | Calculate repayments and total interest at any rate, term and loan amount. | Open → |
| Comparison Rate Calculator | See the true annual cost once establishment and ongoing fees are included. | Open → |
| Offset Savings Calculator | Model how an offset balance reduces interest over the life of the loan. | Open → |
| Extra Repayments Calculator | See the time and interest saved by paying more than the minimum. | Open → |
| Refinance Calculator | Calculate break-even and total savings from switching to a lower rate. | Open → |
| Redraw Buffer Calculator | See how much you've built in redraw and what it means for repayment flexibility. | Open → |
| Rate Change Stress Test Calculator | Stress-test your repayments against +1%, +2%, +3% rate movements. | Open → |
| Home Equity Cash-Out Calculator | Estimate usable equity for renovations, investing or debt consolidation. | Open → |
| Split Loan Calculator | Model fixed/variable splits — combined repayments, total interest and rate sensitivity. | Open → |
| Property Affordability Calculator | Comfortable purchase budget vs lender max, with deposit, LMI, stamp duty and total funds at settlement. | Open → |
| Interest Only Calculator | IO repayments, the P&I cliff and the IO premium vs full P&I from day one. | Open → |
| Rental Yield Calculator | Gross & net rental yield plus cash-on-cash return for any Australian investment property. | Open → |
Group 1 — Planning to buy
These calculators answer the questions you need to answer before making offers on properties. They work best when used in sequence.
1. Borrowing Power Calculator
→ Open Borrowing Power CalculatorEstimates how much you can borrow based on your income, expenses, existing debts, and the current interest rate environment. Gives you a realistic borrowing ceiling rather than a theoretical one — because lenders assess your capacity to repay at rates higher than the current variable rate (typically 3% above).
Use it when:
- You haven't spoken to a lender yet and want to anchor your property search to reality.
- After a rate change — your borrowing power dropped when the RBA hiked in February and May 2026.
- You want to understand how existing debts and credit card limits affect your capacity.
Key features: Income and expense inputs; serviceability buffer applied; maximum loan across different rate scenarios.
Particularly useful for: Anyone before they start making offers — everything else in the home buying process depends on knowing this number.
2. Home Loan Deposit Calculator
→ Open Home Loan Deposit CalculatorWorks out how much deposit you need for a target property price — at different LVR thresholds (5%, 10%, 20%) — and how long it will take to save it at your current savings rate.
Use it when:
- You're a first home buyer building toward a target.
- You're trying to determine whether a guarantor or government scheme could close the deposit gap sooner than continued saving.
- You want to compare buying now at higher LVR vs waiting to reach 20%.
Key features: Target price and savings rate inputs; 5% / 10% / 20% LVR thresholds; time-to-save projection.
Particularly useful for: Pair with the Borrowing Power Calculator (to see if your target property is within reach) and the LMI Calculator (to see what you'd pay if you buy before reaching 20%).
3. LVR Calculator
→ Open LVR CalculatorCalculates your loan-to-value ratio based on property value and loan amount — and shows what that LVR means for your rates, LMI obligations, and lender options.
Use it when:
- You're assessing whether you're above or below the critical 80% LVR threshold.
- You want to see how much of a difference a slightly larger deposit would make.
- Refinancing — your LVR may have improved significantly if property values have risen.
Key features: Property value and loan amount inputs; LVR threshold indicator; rate and LMI implications.
Particularly useful for: Borrowers near the 80% LVR boundary, refinancers checking improved equity position.
Group 2 — Upfront costs and fees
These calculators reveal the real cost of buying a home — beyond the deposit.
4. Stamp Duty Calculator
→ Open Stamp Duty CalculatorCalculates stamp duty (now called transfer duty in most states) on property purchases by state, including first home buyer concessions and exemptions. Returns the exact figure, not a range.
Use it when:
- You're working out your total upfront cash requirement.
- You're a first home buyer checking concession eligibility.
- You're comparing the buying cost across different states.
Key features: State-by-state rules; first home buyer concession logic; investor vs owner-occupier toggle.
Particularly useful for: Every property buyer in Australia. A $736,000 purchase in NSW attracts approximately $27,990 in stamp duty (standard rate); in Victoria it's approximately $39,070. State rules change — this calculator reflects current rules as at May 2026.
5. LMI Calculator
→ Open LMI CalculatorEstimates Lenders Mortgage Insurance cost based on your loan amount and LVR. LMI is charged when you borrow more than 80% of the property value — and the premium increases sharply as LVR rises. The calculator shows both upfront cost and the option to capitalise LMI into the loan.
Use it when:
- You have a deposit below 20% and want to know the LMI cost.
- You're assessing whether to wait to reach 80% LVR vs buying now.
- You want to compare paying LMI upfront vs adding it to the loan.
Key features: Loan amount and LVR inputs; capitalised vs upfront LMI; LVR-band premium tiers.
Particularly useful for: Pair with the Deposit Calculator (to see how long it takes to reach 20%), First Home Guarantee details (which eliminates LMI without 20%), and Guarantor Home Loans (which also eliminates LMI without 20%).
6. Home Buying Costs Calculator
→ Open Home Buying Costs CalculatorTotals all the upfront costs of purchasing a property — stamp duty, conveyancing fees, building and pest inspection, loan establishment fees, title insurance, moving costs, and lender fees. The complete picture of what you need in cash before settlement.
Use it when:
- You're confirming you have enough cash to proceed with a purchase.
- You're budgeting beyond just the deposit and stamp duty.
- You're comparing the total cost of buying now vs waiting.
Key features: All upfront costs in one view; line-item editable; cash-required summary.
Particularly useful for: Use last in the planning phase — after Borrowing Power, Stamp Duty, and LMI. On a $700,000 purchase, total buying costs (beyond the deposit) can easily reach $30,000–$40,000.
Group 3 — Understanding and changing your loan
For loans you already have, or are about to commit to — these tools find the savings other calculators miss.
7. Home Loan Repayment Calculator
→ Open Home Loan Repayment CalculatorCalculates monthly repayments on any loan amount, interest rate, and term combination. Also shows the total interest paid over the life of the loan — which is almost always a wake-up call.
Use it when:
- You want to compare repayments at different rates (e.g., current rate vs +0.5%).
- You're assessing fixed vs variable options.
- You want to see the repayment difference between a 25-year and 30-year term.
Key features: Weekly / fortnightly / monthly toggle; total interest summary; rate sensitivity comparison.
Particularly useful for: Everyone — this is the foundational calculator. The monthly difference between the variable market average (5.51% p.a.) and the best available rate (5.08% p.a.) on a $700,000 loan is around $200/month — $2,400/year.
8. Comparison Rate Calculator
→ Open Comparison Rate CalculatorCalculates the true comparison rate for any loan — incorporating establishment fees, ongoing fees, and the interest rate — to show the real annual cost. Also explains why comparison rates can sometimes be misleading (based on $150,000 over 25 years, which doesn't reflect most modern loans).
Use it when:
- You're comparing home loans and confused by advertised rates vs comparison rates.
- A loan advertises 5.49% with a comparison rate of 5.24% — and you want to understand why.
- You want to see the comparison rate at your actual loan size, not the standard $150,000.
Key features: Application and ongoing fee inputs; IRR-based comparison rate; loan-size override.
Particularly useful for: Anyone comparing two loans where one has a lower rate but higher fees, or vice versa. The standard comparison rate is mandated by Australian consumer credit law and may not be representative of larger loans — always check what fees are included.
9. Offset Savings Calculator
→ Open Offset Savings CalculatorModels how much an offset account balance saves you in interest over time — annually and over the loan term. Enter your loan balance, interest rate, and current or projected offset balance.
Use it when:
- You're considering whether to pay for an offset account feature.
- You're an existing offset holder modelling the impact of a higher balance.
- You want to demonstrate the value of keeping savings in offset rather than a separate account.
Key features: Offset balance projection; annual interest saving; whole-of-loan saving.
Particularly useful for: Pair with the offset account home loans guide — which includes a full break-even analysis of whether an offset loan's premium is worth paying.
10. Extra Repayments Calculator
→ Open Extra Repayments CalculatorShows how much time and interest you save by making extra repayments above your minimum. Models one-off lump sums, regular additional payments, or a combination of both. Shows exactly how many years and months you'll shave off the loan.
Use it when:
- You're on a variable rate and have spare cash flow.
- You've received a windfall (tax refund, bonus) and want to model a lump sum.
- You want to compare the impact of $200/month vs $500/month extra.
Key features: One-off and recurring extra repayments; years/months saved; total interest saved.
Particularly useful for: A consistent $500/month extra on a $700,000 loan at 5.34% cuts approximately 7 years from the loan term and saves over $120,000 in interest. See also: home loans with redraw — if you're making extra repayments, you'll want to understand how redraw works.
11. Refinance Calculator
→ Open Refinance CalculatorCalculates the break-even point for refinancing — how many months it takes for the interest savings from a lower rate to exceed the costs of switching (discharge fee, application fee, valuation, settlement). Also shows total savings over the remaining loan term and monthly repayment comparison before and after.
Use it when:
- You're on a rate you suspect is too high.
- You haven't reviewed your loan in more than 2 years.
- You want to know whether the saving exceeds the switching costs and effort.
Key features: Switching cost inputs; break-even point in months; monthly and lifetime saving.
Particularly useful for: Around 34,800 Australians switch lenders every month. If you're on 5.74% (the average paid by existing variable borrowers) and the market best is 5.08%, the saving on $700,000 is $4,620/year.
12. Redraw Buffer Calculator
→ Open Redraw Buffer CalculatorCalculates how much you've built up in redraw based on extra repayments above the minimum schedule, and models the interest impact of drawing different amounts back out.
Use it when:
- You've been making extra repayments and want to know your available redraw.
- You're weighing whether to redraw vs leave the buffer in place.
- You want to understand how a redraw affects your remaining term and total interest.
Key features: Extra-repayment inputs; available redraw balance; interest impact of withdrawals.
Particularly useful for: Borrowers using redraw as a flexible savings buffer rather than an offset — pair with the redraw vs offset guide.
13. Rate Change Stress Test Calculator
→ Open Rate Change Stress Test CalculatorModels how your monthly repayment changes if rates move up or down by 0.25%, 0.50%, 1%, 2% or 3%. Shows the dollar impact at each step so you know exactly where your budget breaks.
Use it when:
- You're on variable and want to know your repayment if the RBA hikes again.
- You're choosing between fixed and variable and want to quantify the risk.
- You're stress-testing affordability before signing a new loan.
Key features: Rate-shift sliders; new monthly repayment; annual cost increase per scenario.
Particularly useful for: Especially relevant given recent RBA movements — knowing your repayment at +1% and +2% is not academic.
14. Home Equity Cash-Out Calculator
→ Open Home Equity Cash-Out CalculatorCalculates total equity in your property (current value minus remaining loan), then separates usable equity at your chosen LVR ceiling — the amount a lender will actually let you access via cash-out refinance.
Use it when:
- You're considering a renovation, investment property deposit, or debt consolidation.
- Property values have moved and you want to see your new equity position.
- You want to model the new repayment after increasing the loan.
Key features: Total vs usable equity; LVR ceiling input; new loan size and repayment.
Particularly useful for: Refinancers tapping equity for renovations or investing — pair with the refinance home loans guide.
15. Split Loan Calculator
→ Open Split Loan CalculatorModels fixed/variable split home loans. Set your total balance, fixed portion, and the fixed and variable rates. Returns the fixed and variable component repayments and your combined total, plus side-by-side comparison against 100% fixed and 100% variable, and a rate sensitivity table showing what happens to your combined repayment if the variable rate rises 0.5%, 1.0% or 2.0%.
Use it when:
- You want rate certainty on part of your loan but flexibility (offset, extra repayments) on the rest.
- You're approaching a fixed rate expiry and weighing whether to re-fix, go variable or split.
- You want to stress-test different fixed/variable ratios before committing.
Key features: Split ratio slider; fixed and variable rate inputs; offset and extra repayments on the variable portion; scenario comparison; rate sensitivity at +0.5%, +1.0%, +2.0%.
Particularly useful for: Borrowers who don't want to bet the whole loan on one rate structure — pair with the split rate home loans guide.
16. Property Affordability Calculator
→ Open Property Affordability CalculatorShows what you can comfortably afford to spend on a property — separate from what a lender will approve. Returns a comfortable purchase budget (working backwards from your preferred monthly cash flow buffer) alongside your lender-assessed maximum at the APRA +3% serviceability buffer. Adds deposit needed, LMI estimate, state-specific stamp duty and total funds required at settlement.
Use it when:
- You're a first home buyer setting a property search ceiling that won't stretch your cash flow.
- You've been quoted a borrowing capacity by a lender and want to check whether that number is genuinely comfortable.
- Couples combining incomes who need to translate joint income into a realistic purchase price.
Key features: Two-applicant income; expenses, debts and credit card limits; deposit, rate and term inputs; state for stamp duty; FHB toggle for grants and concessions; LVR and buffer preference; comfortable budget vs maximum borrowing with full settlement-day costs.
Particularly useful for: Use before you start inspections — and again once a lender has quoted a number, to sanity check it against your real cash flow.
17. Interest Only Calculator
→ Open Interest Only CalculatorModels interest-only home loans. Set your loan amount, rate, total term and IO period (1–10 years) and see your IO repayment, the P&I repayment that kicks in after the IO period ends, the dollar/percentage jump at the cliff, total interest under each structure, and the IO premium — the extra interest paid by choosing IO over full P&I from day one. Includes a separate-rate toggle for the 0.10–0.40% premium most lenders charge for IO.
Use it when:
- Investors using IO to maximise cash flow and tax deductibility during the investment phase.
- Owner-occupiers considering IO for short-term cash flow relief (parental leave, renovations).
- Borrowers approaching the end of an IO period who need to model the P&I repayment cliff before it arrives.
Key features: Loan, rate and term inputs; IO period 1–10 years; weekly/fortnightly/monthly frequency; optional separate IO rate; IO repayment vs P&I-after-IO with explicit jump; total interest comparison; IO premium in dollars.
Particularly useful for: Use before signing an IO loan to make the cliff visible — and again 6–12 months before IO expiry to plan the switch.
18. Rental Yield Calculator
→ Open Rental Yield CalculatorCalculates gross and net rental yield for an Australian investment property, plus cash-on-cash return once loan and deposit are entered. Inputs cover property value, weekly or annual rent, vacancy rate, management fee and all annual ownership costs (rates, water, insurance, maintenance, strata). Optionally model finance — IO or P&I, your interest rate and term — to see annual cash flow and gearing position in dollars.
Use it when:
- Property investors evaluating a potential purchase against rental income.
- Existing landlords checking whether their current yield justifies holding versus selling.
- Borrowers comparing the yield on two or more investment properties.
- First-time investors trying to understand what a 'good' rental yield actually means.
Key features: Weekly or annual rent toggle; vacancy rate and management fee sliders; itemised expenses; IO vs P&I finance; gross and net yield, yield gap, annual cash flow, cash-on-cash return and positive/negative gearing flag.
Particularly useful for: Use before purchasing an investment property — and again annually as rents and costs move.
How to use the calculator suite together
The calculators are more powerful in sequence than in isolation. Here's how to chain them for the most common situations.
Scenario: Buying your first home
- Borrowing Power Calculator → anchor your property search to a realistic maximum
- Stamp Duty Calculator → know your state's stamp duty and concessions for first home buyers
- LMI Calculator → decide whether to save to 20% or buy now and pay LMI
- Home Buying Costs Calculator → confirm you have enough cash for everything — deposit + all buying costs
Scenario: Refinancing your existing loan
- Refinance Calculator → check the break-even and total saving from switching
- LVR Calculator → see what LVR you're at now — it may have improved since purchase
- Repayment Calculator → compare monthly repayments at current rate vs target rate
- Compare refinance options on LoanGorilla → find the best rate for your profile
Scenario: Deciding whether an offset account is worth it
- Repayment Calculator → compare basic variable vs offset loan repayments
- Offset Savings Calculator → enter your expected offset balance to see annual saving
- Check the offset guide → full break-even analysis of whether the rate premium is worth paying
- Compare offset loans on LoanGorilla → find a competitive offset product
Scenario: Working out how much to make in extra repayments
- Repayment Calculator → see your current minimum repayment
- Extra Repayments Calculator → model different extra amounts and see years saved
- Offset Savings Calculator → compare extra repayments vs keeping the same cash in offset
- Check redraw rules → understand how to access your extra repayments if needed
Home Loan Calculators FAQ's
Compare home loans — 100+ lenders, real rates
Calculators show you the picture. LoanGorilla connects you to the loan. Free, no credit score impact.
Compare NowReviewed by LoanGorilla editorial team | Last updated: May 2026
All calculator results are estimates for general guidance only and do not constitute a quote, pre-approval, or personal financial advice. Actual loan costs depend on your individual credit profile, lender assessment, applicable fees, and product-specific terms. Comparison rates for marketed products are based on a secured loan of $150,000 over 25 years and may not reflect all loan amounts, terms or structures. WARNING: This comparison rate is true only for the example given and may not include all fees and charges. LoanGorilla compares home loans from 100+ lenders as of May 2026.