Here are some useful Online Financial Calculators
Motor Vehicles:
http://www.cchwebsites.com/content/calculators/CAAutoLoan.html
Home Loans:
https://www.nab.com.au/personal/loans/home-loans/home-loan-calculators/loan-repayments-calculator
Personal Loans:
http://www.gemoney.com.au/loans/personal-loan-calculator.html