Free calculators for everyday Aussie money questions
Fast, simple and up to date for 2026–27. No sign-up, no clutter, and they work great on your phone.
GST Calculator
Add or remove 10% GST from any amount in one tap.
Stamp Duty Calculator
Transfer duty for every state, with first home buyer concessions.
Home Loan Refinance Calculator
Monthly saving, break-even time and interest saved by switching.
Car Loan Refinance Calculator
Compare your car loan with a cheaper one, fees and balloon included.
Compound Interest Calculator
Watch your savings grow with interest and regular deposits.
HECS-HELP Repayment Calculator
Your compulsory repayment under the new marginal system.
Fuel Cost & Trip Split
What a road trip costs in fuel, and each person's share.
Solar Payback Calculator
Yearly savings and payback time for rooftop solar.
Days Between Dates
Count days, weeks and business days, or add days to a date.
Why use CalcMate?
Every calculator is built for Australian rules and reviewed against official sources, including the ATO and state revenue offices. Results update instantly as you type, and each page explains how the numbers are worked out, so you can check them yourself.
Rates last reviewed October 2026. Results are general information only, not financial advice.