Australian Calculators Made Simple
Practical calculators for money and tax, property, cars and travel, caravan and towing, home and energy, and everyday maths — with Australian units, dollars and assumptions spelled out on every page.
Popular calculators
- GST CalculatorAdd or remove Australian GST from an amount.
- Salary CalculatorWork out your take-home pay after income tax, LITO and the Medicare levy for 2026–27, and convert salary into monthly, fortnightly, weekly and hourly pay.
- Mortgage Repayment CalculatorEstimate principal and interest repayments on an Australian home loan.
- Stamp Duty CalculatorEstimate transfer duty on a property purchase by state or territory.
- Superannuation CalculatorEstimate employer super contributions on your ordinary time earnings.
- Car Loan CalculatorEstimate repayments on a car loan, including an optional balloon payment.
- Fuel Cost CalculatorWork out the fuel cost of a trip using litres per 100km and the pump price.
- Cents Per Km CalculatorEstimate your ATO work-related car expense tax deduction using the cents-per-kilometre method — not a trip fuel cost.
- EV Charging Cost CalculatorWork out kWh required, charging time and cost to charge an electric vehicle at home or at a public charger.
- Solar Payback CalculatorEstimate how long a rooftop solar system takes to pay for itself.
- Caravan Payload CalculatorCheck how much payload is left in your caravan against its ATM.
- Towing Capacity CalculatorCheck your tow vehicle's remaining capacity against GVM and GCM.
- Swimming Pool Water Fill CalculatorWork out how many litres or kilolitres it takes to fill a rectangular or round pool.
- Property Land Size CalculatorConvert a rectangular block's dimensions into square metres, hectares and acres.
- Age CalculatorWork out an exact age in years, months and days.
- Percentage CalculatorWork out a percentage of an amount, or the percentage change between two numbers.
- Date Difference CalculatorCount the days, weeks and weekdays between two dates.
- Unit ConverterConvert between common metric and imperial units used in Australia.
Categories
- Money & Tax
GST, salary, super, savings and percentages.
- Property
Mortgage repayments, stamp duty and property costs.
- Cars & Travel
Fuel, EV charging, car loans and trip costs.
- Caravan & Towing
Payload, towing capacity and tow-ball weight.
- Home & Energy
Solar payback, electricity and running costs.
- Everyday Calculators
Age, dates, percentages and unit conversions.