Calin Professional is a high-end interest calculator for law, accounting, business and government.

How can you use Calin Professional?

Calin V3 Professional (“C3P”) is a secure desktop Application which calculates interest in a very wide range of contractual and legislative situations. For example it handles situations involving multiple debts and payments, interest rates that change over time and optionally by amount, it lets you enter static interest rates or keep files of historic rates. You can control every aspect of the calculation including rate review rules, rounding, order of applying payments, days per year, and frequency of interest impositions. It handles compound interest at any defined frequency.

In other words it can easily calculate interest in most contractual and legislative situations, including simple debts, credit-card or revolving store style accounts characterized by multiple debits and credits, leases, loans, compound interest and numerous other situations. It also has a mode where you can check whether the interest charged by your own financial institutions (eg on your bank overdraft) is correct.

Audio-video presentation for Australian Legal Practitioners.

Go to this link to see a fully narrated video demonstration on your web browser.

More Information.

See below for more detailed information. Your best starting point is to download the Overview document and to look at the multimedia video examples.

You might also like to have a good look at the User Manual.

Information Documents

• Overview (PDF)
• Top 5 Reasons to Invest & Have you considered? (PDF)
• Engineering and Detailed Specifications (PDF)
• Three Example Calculations (PDF)
• Complete Information Guide – contains all the above in one document (PDF)


• Comparison of Calin Professional with Calin Basic
• See the on-line user manual

On-line Multimedia Demonstrations

Download a PDF file showing all the example calculations.

• Example 1: Simple Amount with Static Rate of interest
• Example 2: Simple Amount with File Rate of interest
• Example 3: Simple Amount with Queensland Statement of Claim situation
• Example 4: Simple Amount with Queensland Default Judgment situation
• Example 5: Multiple Cases, Static Interest Rate With Simple Amounts
• Example 6: Transactions with Static Rate of interest calculated daily
• Example 7: Transactions with Static Rate of interest and daily compounding
• Example 8: Transactions with Static Rate of interest calculated every 30 days, no compounding
• Example 9: Transactions with File Rate of interest calculated every 30 days
• Example 10: Transactions with File Rate of interest calculated daily
• Example 11: Transactions with File Rate of interest calculated daily, Static rate of interest on Credits
• Example 12: Transactions with File Rate of interest that changes by amount and date, Static rate of interest on Credits
• Example 13: Transactions with File Rate plus 2%
• Example 14: Transactions with File Rate of interest uplifted by 1.10
• Example 15: Transactions with payment allocation order that benefits the Debtor
• Example 16: Transactions with special payment allocation order
• Example 17: Transactions where some items aren't subject to interest
• Example 18: Transactions with items that have 14 day payment terms i.e. a period interest-free
• Example 19: Repayment Plan 1: Specific number of instalments
• Example 20: Repayment Plan: flexible number of instalments
• Example 21: Repayment Plan: reduce debt to figure other than $0
• Example 22: Repayment Plan: synchronise repayments with other event
• Example 23: Repayment Plan: accommodating ad hoc payment
• Example 24: Repayment Plan: fine tuning instalment dates and amounts
• Example 25: Repayment Plan: Moratorium interest periods

What can I do to find out more?

• Download a trial version of Calin today.
• Find out how to purchase Calin
• Got a question? Look at the frequently asked questions
• Still haven't got the information you want? Contact us