Home Loan Calculators and Guides for Australia

Buying a home, or paying one off, comes down to a handful of numbers: what the repayments are, how much a lender will let you borrow, what the buying costs add up to, and how much interest you can save along the way. HomeLoansCalculator.au has calculators for each of those numbers and plain guides that show the working, so you can check the results yourself.

Every guide uses official Australian sources first, including Moneysmart, ASIC, APRA, the Reserve Bank, Housing Australia and the state and territory revenue offices. Each page shows the date we checked its figures. We last checked everything on this page on 29 October 2026.

HomeLoansCalculator.au is a general information site run by Dominet BV. This page is general information only and is not financial advice. It does not consider your objectives, financial situation or needs. We are not a lender or a mortgage broker and we don't recommend any loan. Check with a licensed professional or the lender before you act. Figures were checked on 29 October 2026. Read our general information notice. Calculator results are estimates based on the numbers you enter.

Calculators

• Repayments calculator: monthly, fortnightly or weekly repayments and total interest for any loan amount, rate and term.
• Borrowing power calculator: a rough guide to how much you might borrow, tested at a rate 3 percentage points higher, as lenders do.
• Offset calculator: the interest and time an offset balance could save.
• Extra repayments calculator: what regular or one-off extra payments do to your loan.
• Stamp duty calculator: transfer duty in every state and territory, with first home buyer concessions where they apply.
• LMI calculator: your loan-to-value ratio and the deposit you'd need to reach 80%.
• Refinance cost calculator: monthly savings from a new rate and how long switching costs take to pay back.

Repayments and loan features

• Home loan repayments: how they are worked out: the formula, how rate and term change the result, and fortnightly payments.
• Extra repayments: time and interest saved: worked examples for monthly extras and lump sums.
• Mortgage offset accounts: how much interest they save: how offset works day to day, and when it's worth the fee.
• Fixed vs variable home loans: revert rates, break fees, split loans and repayment scenarios.
• Comparison rate explained: what's in it, what isn't, and why it can mislead on bigger loans.

Borrowing and buying costs

• Borrowing power: how lenders work out what you can borrow: the APRA serviceability buffer, income and expenses, and debt-to-income limits.
• Stamp duty by state: rates for all eight states and territories, with worked examples.
• Lenders mortgage insurance: the 80% LVR line, how to work out your deposit, and official ways around LMI.
• First home buyer schemes and grants by state: the 5% Deposit Scheme, Help to Buy, and every state's grant and duty concession.

Switching loans

• Refinancing costs: when switching pays off: the fees, the break-even calculation and the loan term trap.

A few numbers as at 29 October 2026

• The RBA's cash rate target is 4.60%, effective 30 September 2026.
• APRA's serviceability buffer is 3 percentage points above the loan rate. Lenders test whether you could still afford repayments at that higher rate. APRA confirmed this on 28 May 2026.
• Under the Australian Government 5% Deposit Scheme, eligible first home buyers can buy with a 5% deposit and no LMI. Since 1 October 2025 there are no income caps or waitlists.

These change, so each guide links to the official page and shows when we checked it.

How we work

We're an information site, not a lender or broker. We don't take loan applications, we don't refer you to lenders, and we don't recommend products. Our calculators use the numbers you enter and the official rates and thresholds listed on each page. We write the guides ourselves, show our working in the worked examples, and leave out any figure we couldn't check against an official source. When rules change, we update the page and the date.

A calculator can't tell you whether a lender will approve you or which loan suits you. For that, talk to the lender or a licensed professional, such as a mortgage broker or financial adviser who holds the right licence.

Frequently asked questions

Are the calculator results accurate?

They're estimates based on the numbers you enter and the assumptions each calculator lists, such as a rate that stays the same for the whole term. Your lender's figures may differ because of fees, rate changes and how it rounds.

Does HomeLoansCalculator.au recommend lenders?

No. We're a general information site run by Dominet BV. We don't recommend lenders or loans, and we don't arrange credit.

How do lenders work out how much I can borrow?

They look at your income, expenses and debts, and test whether you could afford repayments at a rate at least 3 percentage points above the loan rate. Our borrowing power guide explains the steps.

Where do the stamp duty figures come from?

From each state and territory revenue office. Our stamp duty guide lists the rates and links to every official source, with the date we checked them.

Do I need a 20% deposit?

Not always. With less than 20%, you may need to pay LMI, but the 5% Deposit Scheme lets eligible buyers borrow up to 95% without it. See our LMI guide and first home buyer schemes guide.