How to calculate credit card interest


Nick Bendel

Nick Bendel

Nov 14, 2017( 1 min read )

Credit card interest can quickly turn a manageable balance into unmoveable debt. So being able to understand how interest rates translate into dollars is an important skill to acquire.

The common mistake people make is focusing on the credit card’s annual percentage rate (APR), which often sits between 15 and 20 per cent. While the APR does provide a rough idea of how much interest you’ll pay, it’s not entirely accurate.

This is because you actually accrue interest on your balance daily, not annually. So, you need to work out your daily periodic rate (DPR). To do this, divide your card’s APR by the number of days in a year (e.g. 16.9 per cent divided by 365, or 0.05 per cent). You can then apply this figure to the daily balance on your credit card.


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