Useful next calculations
When to use this calculator
- Before comparing personal loan or credit offers on the same amount and term.
- When you want to see total interest, not only the monthly payment.
- When you are choosing between a shorter term and a lower monthly debit.
- When you need a planning estimate before making a credit application.
A worked example
These are the example figures the calculator opens with.
| Input | Value |
|---|---|
| Car Price (A$) | A$15,000 |
| Deposit (A$) | A$3,000 |
| Interest Rate (%) | 7.9% |
| Term (Years) | 4 years |
For those figures the calculator returns:
- Monthly: A$292.39
- Total cost: A$17,034.82
- Interest: A$2,034.82
Method & assumptions
This calculator works out your monthly repayment, total interest paid, and overall cost of borrowing based on the loan amount, interest rate (APR), and repayment term you enter. It uses the standard amortisation formula, so each monthly payment covers accruing interest first with the remainder reducing the outstanding principal. The APR field should reflect the annual percentage rate quoted in your finance agreement — not the flat rate, which can look artificially low. The calculator does not account for arrangement fees added to the loan or payment protection insurance (PPI) premiums, so add those separately if relevant. Results are illustrative; always verify figures with your lender before signing any agreement.
Common mistakes
- Using an assumption that is not supported by a current local quote, bill, statement or official source.
- Treating a generic estimate as a lender, provider, payroll or tax authority decision.
- Mixing monthly and annual inputs without converting them consistently.
- Testing only one scenario instead of checking how a cautious assumption changes the result.
What to do next
- Run a second scenario with a cautious assumption so you can see the downside clearly.
- Compare the result with the related calculators below before making a decision.
- Check current local rules, eligibility and provider terms before applying or committing money.
- Keep a record of the assumptions so you can update the estimate when a quote, bill or pay figure changes.