Home Loan Calculators — 14 Free Tools for Australian Borrowers.
Work out how much you can borrow, what repayments will cost you, and how features like offset and extra repayments stack up over time. Every tool is free, instant, and built for the Australian lending market.
What's in this category
These are the calculators that focus on the home loan itself— what you can borrow, what repayments will look like, and how different features and structures play out over the life of the loan. If you're at the "is this affordable?" stage or comparing loans head-to-head, this is the right starting point.
We've grouped the 14 home loan calculators by purpose:
Capacity: how much can you borrow?
The starting point for any home loan journey.
Borrowing power calculator
Estimates how much an Australian lender would likely let you borrow based on your income, expenses, existing debts, and the lender serviceability buffer (currently a 3% rate buffer above the actual rate). Two lenders can return very different numbers for the same applicant — this gives you a realistic starting figure.
Repayments: what will it cost each month?
See your real monthly cost across different scenarios.
Home loan repayment calculator
Calculates monthly repayments for any loan amount, interest rate, and term. Compare scenarios side by side — different rates, different terms, different loan amounts.
Fortnightly repayment calculator
Calculates monthly repayments for any loan amount, interest rate, and term. Compare scenarios side by side — different rates, different terms, different loan amounts.
Extra repayment calculator
Shows how much faster you'll pay off your loan — and how much interest you'll save — by adding extra to each repayment. Even $100 extra per month can save tens of thousands over the life of a loan.
Lump sum repayment calculator
Models the impact of a one-off lump sum repayment — a tax return, bonus, or inheritance — on your loan balance and total interest paid.
How long to repay calculator
Works out how long it'll take to pay off your loan at a chosen repayment amount. Useful if you want to target a specific payoff date.
Loan features: offset, splits, interest-only
Compare loan features and see what they save.
Offset account calculator
Shows how much interest you'd save by holding savings in an offset account linked to your home loan. Offset balances reduce the interest charged on your loan as if you'd paid down the loan balance — without losing access to the cash.
Split loan calculator
Models a part-fixed, part-variable home loan. You get rate certainty on the fixed portion and flexibility on the variable portion.
Interest-only calculator
Compares interest-only repayments against principal-and-interest. Useful for investors maximising cash flow and tax-deductible interest, but watch the cliff — when interest-only reverts to P&I, repayments jump.
Comparison: loan A vs loan B
Compare loan offers fairly, including fees.
Comparison rate calculator
Calculates a loan's true comparison rate — interest plus most standard fees, expressed as a single percentage. The "headline rate" can be misleading; the comparison rate is the fairer comparison.
Loan comparison calculator
Lets you compare two home loans side by side — rates, fees, features, total cost over the loan life.
Introductory rate calculator
Shows what a "honeymoon" or introductory rate actually costs once it reverts to the standard variable rate.
Refinancing: what would you save?
See whether switching is worth it.
Mortgage switching calculator
Calculates potential savings from refinancing your current loan to a better rate, factoring in switching costs (discharge fees, application fees, valuation costs). If you settled your current loan more than two years ago, this calculator is worth running.
Specialist: reverse mortgages
Equity release for older Australians.
Reverse mortgage calculator
Estimates equity release for older Australians considering a reverse mortgage. These products let you borrow against your home equity without making repayments — but the interest compounds, so the loan grows over time.
What's in this category
The calculators give you accurate estimates — they use the same formulas Australian lenders use. But three things to remember:
- Different lenders return different numbers. Two lenders applying their own serviceability policies to your same income and expenses can return borrowing capacities that differ by $100,000 or more. The calculator gives you the market average; a broker gives you the lender-specific reality.
- Buffers matter. APRA requires lenders to test your serviceability at an interest rate 3% above the actual rate. The calculator applies this. Some lenders test slightly differently.
- Real applications include real expenses. Be honest with the calculator about your living expenses — lenders use the Household Expenditure Measure (HEM) as a floor, but your actual expenses can drive serviceability lower.
For a number specific to your situation across our 30+ lender panel, book a free call.
Browse other calculator categories
Savings Calculators
Compound interest, budget, savings goals
Home loan calculator questions
Q1- Which Home Loan Calculator I used first?
If you're at the early stage, start with the borrowing power calculator. It tells you what's realistic. Then move to the repayment calculator to see what monthly cost feels affordable.
Q1- Which Home Loan Calculator I used first?
If you're at the early stage, start with the borrowing power calculator. It tells you what's realistic. Then move to the repayment calculator to see what monthly cost feels affordable.
Q1- Which Home Loan Calculator I used first?
If you're at the early stage, start with the borrowing power calculator. It tells you what's realistic. Then move to the repayment calculator to see what monthly cost feels affordable.
Q1- Which Home Loan Calculator I used first?
If you're at the early stage, start with the borrowing power calculator. It tells you what's realistic. Then move to the repayment calculator to see what monthly cost feels affordable.
Q1- Which Home Loan Calculator I used first?
If you're at the early stage, start with the borrowing power calculator. It tells you what's realistic. Then move to the repayment calculator to see what monthly cost feels affordable.
