Disclaimer: Results are estimates only; rates, fees and lender terms vary, so confirm them with your provider.
Estimate weekly, fortnightly or monthly home loan repayments using the property price, deposit, interest rate and loan term. This Australian Mortgage Calculator also shows the financed loan, LVR, total interest and total repayments.
What Is an Australian Mortgage Calculator?
An Australian Mortgage Calculator is an online tool that estimates home loan repayments using the information entered. It helps users compare borrowing estimates and understand the potential long-term impact before contacting a lender.
The calculator subtracts the deposit from the property price to determine the base loan amount. It then adds any entered Lenders Mortgage Insurance (LMI) or lender fees to calculate the total financed loan.
Unlike a borrowing-power tool, it does not determine mortgage approval or assess income capacity. It estimates the cost of a loan scenario entered by the user.
Many people combine australia mortgage calculators with income insights and expense planning. Simple Salary Calculators, such as the Simple Salary Calculator, can help you understand your earnings before comparing them with a proposed repayment.
A mortgage may also affect long-term retirement planning. The Super Retirement Calculator estimates retirement savings separately from the home loan.
How to Use the Australian Mortgage Calculator
Step 1: Enter the property price
Enter the complete purchase price. The visible calculator placeholder uses A$780,000.
Step 2: Enter your deposit
Enter the amount you will contribute from savings. The placeholder uses A$180,000, and the deposit must be lower than the property price.
Step 3: Enter the interest rate
Enter the expected annual home loan interest rate. The visible placeholder uses 6%.
Step 4: Enter the loan term
Enter a whole-number term between 1 and 50 years. The placeholder uses 25 years.
Step 5: Select the loan type
Principal plus interest is selected by default.
Alternatively, select an interest-only period and enter a whole-number duration between 1 and 10 years. The interest-only period must be shorter than the complete loan term.
Step 6: Select repayment frequency
Monthly is selected by default. Fortnightly and weekly options are also available.
Step 7: Add financed lender costs
Enter any LMI or lender fees that will be added to the loan. The visible placeholder uses A$16,000.
The calculator does not determine whether LMI applies or calculate the premium automatically. Enter an amount only when it has been quoted and will be financed.
Step 8: Press Calculate
The user-friendly platform provides instant results for the repayment, base loan, total financed loan, LVR, total interest and total repayments. This online tool works in a mobile or desktop browser, so no separate desktop tool is required.
Before judging affordability, review gross income, wages and other earnings with the income calculator Australia.
Gross income is not the amount available after deductions and taxes. The take home pay calculator helps compare the mortgage repayment with net income or net salary.
Salary calculation software, a payroll calculation tool or Software to Calculate Salary may display employee pay, annual salary, monthly salary and weekly salary. These digital tools can support mortgage planning but do not replace a lender’s assessment.
How Are Mortgage Repayments Calculated?
The calculator first subtracts the deposit from the property price:
Base loan = Property price − Deposit
It then adds any financed costs:
Total financed loan = Base loan + Financed LMI or lender fees
For principal-and-interest repayments, the calculator uses:
Repayment = P × r ÷ [1 − (1 + r)⁻ⁿ]
In this formula:
- P is the total financed loan
- r is the interest rate for each repayment period
- n is the total number of repayments
The annual rate is divided by 12 for monthly repayments, 26 for fortnightly repayments or 52 for weekly repayments. The loan term is multiplied by the same number to determine the total repayment periods.
The remaining calculations are:
Total repayments = Regular repayment × Number of repayments
Total interest = Total repayments − Total financed loan
The formula assumes the entered interest rate remains unchanged. It does not include future rate movements, offset balances, redraw transactions or extra repayments.
A compound interest calculator performs a different calculation by estimating the growth of savings rather than the repayment of mortgage debt.
Australian Mortgage Repayment Example
This example uses the calculator’s visible placeholders and default selections:
- Property price: A$780,000
- Deposit: A$180,000
- Interest rate: 6% per annum
- Loan term: 25 years
- Loan type: Principal plus interest
- Repayment frequency: Monthly
- LMI or lender fees added to loan: A$16,000
The base loan is:
A$780,000 − A$180,000 = A$600,000
Financed costs are then added:
A$600,000 + A$16,000 = A$616,000
The number of monthly repayments is:
25 × 12 = 300 repayments
Using the same JavaScript formula as the calculator, the displayed results are:
- Estimated monthly repayment: A$3,968.90
- Base loan amount: A$600,000.00
- Total financed loan: A$616,000.00
- Loan-to-value ratio: 78.97%
- Deposit percentage: 23.08%
- Estimated total interest: A$574,668.99
- Estimated total repayments: A$1,190,668.99
The calculation assumes the 6% interest rate remains unchanged for the complete 25-year term. Actual repayments may differ because of changing rates, lender fees and lender calculation methods.
Anyone asking “how can I manage my budget?” should compare the A$3,968.90 monthly repayment with take-home pay, savings and monthly expenses. The salary budget calculator supports salary calculation and budgeting for Australian households without replacing professional personal finance advice.
Budgeting apps can help track spending, but they may not contain the same loan formula or inputs as dedicated smart calculation tools.
What Is Loan-to-Value Ratio (LVR)?
LVR compares the total financed loan with the property price:
LVR = Total financed loan ÷ Property price × 100
Using the calculator example:
A$616,000 ÷ A$780,000 × 100 = 78.97%
The deposit percentage is:
A$180,000 ÷ A$780,000 × 100 = 23.08%
A larger deposit normally reduces the base loan and LVR. Adding LMI or lender fees increases the financed amount and displayed LVR.
The calculator does not calculate LMI or stamp duty automatically. These costs may depend on the lender, insurer, state or territory, property details and buyer eligibility.
Salary details, tax deductions, payroll management and financial rules under Australian tax systems are not used in the LVR formula. They may still affect cash flow and mortgage affordability.
If a packaged vehicle is another financial commitment, the car salary sacrifice calculator can estimate that separate arrangement. It has a different purpose from a general Salary Sacrifice Calculator and does not change the mortgage result.
Principal and Interest vs Interest-Only Repayments
Principal-and-interest repayments cover interest and gradually reduce the amount borrowed. The calculator estimates a regular repayment over the selected loan term.
During an interest-only period, repayments cover interest without reducing the principal. When that period ends, the complete principal must be repaid over the shorter remaining term.
For example, a four-year interest-only period matches the calculator’s conditional placeholder. On a 25-year loan, this would leave 21 years to repay the principal.
Using the same A$616,000 financed loan and 6% annual rate, the initial monthly interest-only repayment would be:
A$616,000 × 6% ÷ 12 = A$3,080.00
After the four-year interest-only period, the calculator would estimate the principal-and-interest repayment across the remaining 21 years. The later repayment would therefore be higher than the initial A$3,080 interest-only amount.
Moneysmart advises borrowers to check whether they can afford the higher repayments that may apply when an interest-only period ends.
The calculator assumes the same interest rate during both stages. It cannot calculate salary accurately, assess salary structure or determine whether a lender will approve an application.
Frequently Asked Questions
Q1: Does the calculator automatically calculate LMI?
A: No. Enter LMI or lender fees only when you know the amount and it will be financed into the loan.
Q2: Does it calculate stamp duty?
A: No. Stamp duty is excluded because it varies by location, property details and buyer eligibility.
Q3: Can it calculate weekly and fortnightly repayments?
A: Yes. Select monthly, fortnightly or weekly before calculating.
Q4: What is the base loan?
A: It is the property price minus the deposit.
Q5: What is the total financed loan?
A: It is the base loan plus any entered LMI or lender fees.
Q6: Can I calculate an interest-only loan?
A: Yes. Select interest-only and enter a period between 1 and 10 years that is shorter than the total loan term.
Q7: Why does the repayment increase after an interest-only period?
A: The principal is not reduced during that period, so it must be repaid over the shorter remaining term.
Q8: Does the calculator show how much I can borrow?
A: No. It estimates repayments and does not assess income, expenses, credit history or lender eligibility.
Q9: Are the results a lender quote?
A: No. Results are estimates and do not represent mortgage approval, pre-qualification or a lender quote.