How to Calculate Average Daily Balance

The average daily balance (or daily average balance) is calculated by adding the ending balances of each day for a defined number of days (usually 30 days for credit card calculations) and dividing it by that total number of days.

For example:

  • Ending balance for Day 1: $1000.00
  • Ending balance for Day 15: $2000.00 (because you bought some things worth $1000 on this day)
  • Ending balance for Day 20: $1500.00 (because you paid off $500 on this day)

The above example would really look like this:

Day Balance
1 $1000.00
2 $1000.00
3 $1000.00
4 $1000.00
5 $1000.00
6 $1000.00
7 $1000.00
8 $1000.00
9 $1000.00
10 $1000.00
11 $1000.00
12 $1000.00
13 $1000.00
14 $1000.00
15 $2000.00
16 $2000.00
17 $2000.00
18 $2000.00
19 $2000.00
20 $1500.00
21 $1500.00
22 $1500.00
23 $1500.00
24 $1500.00
25 $1500.00
26 $1500.00
27 $1500.00
28 $1500.00
29 $1500.00
30 $1500.00
Total $40,500.00

Now divide the total ($40,500.00) by the total number of days (30) and you get an average daily balance of $1,350.00 which is what your credit card company will calculate your credit card interest against.

To make your life easier, I have created an average daily balance calculator.

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