The ExcelHelpDesk Support team received the following request for help

### Problem – Calculate Sum of Hours for Activity Code

*I have three columns running down two pages. Columns A, B and C. A equals a start time, B equals ending time. Both are using military time. Column C represents an activity selected from a pick list. Such as “Patrol.” How do I write a function or formula to automatically give me the total amount of time spent on “Patrol” for the whole workbook for the activity of “Patrol” only? For example
Col A Col B Col C
08:00 10:00 Patrol
10:00 11:00 Lunch
11:00 12:00 Patrol
I need a cell to illustrate Patrol=3 hours
*

For this problem we received a copy of the workbook. We then used a formula to calculate the number of hours between A and B for the activity. Lastly we created a formula to SUM all the activities for the daily log.

### SUMIF formula for Activity Codes

See below an example of the activity log data provided

### Step 1 – Create formula to calculate the Hours

The first step is to create the formula that will calculate the number of hours for the activity in the log. In this case we have the “Initiated Time” in column **A**, “Clear Time” in column **B**. The “Total Hours” will be included in column **D**, starting with cell **D16** the formula will be

=IF(C16<>“”,B16-A16,””)

Make sure **D16** is “Time” format before including the formula. This will ensure that the calculation shows the hours in a time format. Once the formula is created in **D16** then it is dragged down for the remaining rows. See the formula below.

### Step 2 – SUMIF to Total the values by Activity code

Now using a list of all available “Activity” codes a SUMIF formula is created to calculate the total number of hours in the Activity Log for each Activity. The formula will use a RANGE of cells to determine the data that is to be included to the calculation. The RANGE needs to include the Activity code as the first column in the range. This is important when we select the criteria as the first column is used to match for the SUM of the values. The range in this case will include the Activity Code and the Total Hours for that Activity in the log. See below for the RANGE selection in this case.

Now the SUMIF formula is created using the RANGE above as the data source. See below the RANGE is specified as **$C$16:$D$23** which includes the Activity Code and the Total Hours. The CRITERIA is specified as the Activity Code in the Daily Totals table in this case **A96**. Lastly we need to specify the SUM_RANGE in this case the numbers we want to total are in the column next to the Activity Code. So the SUM_RANGE is **$D$16:$D$23**.

Finally the SUMIF formula is dragged down the rest of the Activity Codes to calculate the total hours in the Activity Log for each of the codes. See the image below for the final view with the SUMIF formula calculating hours for the Activities that are listed in the Activity Log.

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Thank you for the help. This was a tremendous step forward in the form I was attempting to complete. I had attempted to figure this out on my own as well as ask others, but had been unsuccessful. Not only did you solve my problem, but it was solved in a matter of a couple days and was a free service. Whenever I have a problem or want some more knowledge on excel, I will be visiting your website.