Monthly Credit Card Interest Calculator

Monthly Credit Card Interest Calculator (Daily and Annual calculations too)

Need to calculate how much monthly interest on credit card? So did I. I needed to figure out whether it would be worthwhile for me to go through with a balance transfer. So, I found the formula to calculate credit card interest per month and decided to offer this tool to the rest of you who are in my situation.

Along with calculating the monthly interest it also tells you how much you’re spending per day and year too! Enjoy!

Read a related article: How Credit Card Interest is Calculated

Just enter both your Balance and APR (%) numbers below and it will auto-calculate your daily, monthly, and annual interest rate.

Balance$
APR (%) 
Days in Month 
Days in Year 
Interest Per Day$
Interest Per Month$
Interest Per Year$