ATO – Calculators & Tools
http://www.ato.gov.au/Calculators-and-tools/?sorttype=SortByTopic
ATO – Income Tax estimator calculator
https://www.ato.gov.au/Calculators-and-tools/Income-tax-estimator/
ATO – Tax Withheld calculator
http://www.ato.gov.au/Calculators-and-tools/Tax-withheld-calculator/
ATO Fuel Tax Credit calculator
https://www.ato.gov.au/Calculators-and-tools/Fuel-tax-credit-tools/
ATO – Small Business Tax calculator
https://www.ato.gov.au/Calculators-and-tools/Small-business-income-tax-offset-calculator/
Exchange Rate calculator
http://www.x-rates.com/calculator/