Bank account balances can change almost constantly as you spend and earn money and transfer funds. The balance at a given moment doesn't always offer an accurate picture of an account. Average balances can give a more accurate measure of its typical worth over a given period.

## Simple Average Balance

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Record the account's balance at the beginning of the period in question.

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Record the balance at the end of the period.

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Add the values from steps 1 and 2 and divide by 2. The result is the simple average balance for the period.

## Daily Weighted Average Balance

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Record your account balance each day of the month.

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Add up the daily balances recorded in step 1.

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Divide the result of step 2 by the number of days in the month. The result is the average balance for the month, weighted by your daily account balance. A daily weighted average provides a more accurate estimate of your typical account balance for a month than the simple average.

## Monthly Weighted Average Balance for a Year

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Record your account balance at the end of the each month of a year.

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Add up the values you recorded in step 1.

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Divide the result of step 2 by 12. The result is the average balance of the account for the year, weighted by month.