Australian Financial Calculators
Free, fast and accurate calculators for the most common money decisions Australians face — built with current 2025–26 rates and tested logic. No sign-up. No fluff.
Mortgage Calculator
Estimate weekly, fortnightly or monthly home loan repayments and see total interest over the life of the loan.
Calculate repayments →Stamp Duty Calculator
Work out transfer duty for any Australian state or territory, including current first home buyer concessions.
Calculate stamp duty →Income Tax Calculator
See your income tax, Medicare levy and take-home pay using ATO 2025–26 brackets — annual, monthly and weekly.
Calculate tax →Debt Payoff Calculator
Add multiple debts and compare the snowball and avalanche methods. See months to debt-free and interest saved.
Plan payoff →Rent vs Buy Calculator
Compare the long-term cost of buying versus renting in Australia, including property growth and rental inflation.
Compare costs →Why Calcula
Calcula is built for Australians. Every calculator uses current Australian rates — ATO income tax brackets for 2025–26, state-by-state stamp duty schedules, and standard amortisation maths used by Australian lenders.
The tools are designed to give you a fast, useful estimate before you speak to a broker, accountant or financial adviser. They are not financial advice — see our disclaimer.