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Crc 16-ccitt Calculator?

Hello folks!

I need a method to calculate a 16 bit CRC code using the CCITT standard for a randomized 6-byte hex number.

For my application the 2 CRC bytes then needs to be if the CRC ends up being C552, it would be written as 52C5.

Anyone familiar with how to accomplish this?

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On my calculator, if I divide 462,534.05 by 335 I get 1,380.70. Then if I times 1,380.70 by 335 I get 462,534.50. Which is what I need it to be because I need to calculate the difference of a figure not dividing equally.

On excel, if I divide 462,534.05 by 335 I get 1,380.70. Then if I times 1,380.70 by 335 I get the SAME result of 462,534.05.

I have to account for the difference of not dividing equally so there is some format or accounting function that's preset that I don't want but I have no idea how to fix it or format my excel sheet to calculate as my calculator would.

Please can someone help? Thanks!

I am looking for a method/formula that will reverse multiple text entries from "abcde" to "edcba". The entries are composed of several words that need to be reversed ie from "ab cde fg" to "gf edc ba"


Good afternoon,

Is there a way to enter a colon into a standard number to create a value that can be formatted into a 24 hour time value ?

eg a time is listed as 1345 with a general number format, and I want it returned as 13:45 witha custom format of hh:mm.

Other than creating a table and using a vlookup function, I am hoping there is a better way?


I have data with time in standard fromat i.e. 3:00PM but I need it to be in
24 hour format i.e. 15:00. How can I do this?


I have two columns of data: column A contains the date and time in the form dd/mm/yyyy. Column B contains a number value. All the times are in order, so column A looks like:


I have data from 2007 to 2010. I need to calculate an average daily value (in column B) for each month, and display it in column C. So, for January, I need to calculate the average of 31 days, February, 28 days, etc.

Is there a function I can use to do this? I've been trying the AVERAGEIF formula but can't get it to work. Any ideas would be much appreciated!

Many thanks,

Hi folks,

Hoping someone can help me quickly as I'm pulling my hair out and have a deadline getting too close.

Been trailing the net and this board but can't work out how to do a simple variance.

How do I work out the difference between two numbers - including negatives.

If the numbers are all positive, it's fine as it's simply a case of A - B = C which is your difference. However, that doesn't work if B is negative.

I need a formula that would give the following:

First Number / Second Number / Difference
1 / 5 / 4
1 / -5 / -6
-1 / 5 / 6
-1 / -5 / -4
-5 / -1 / 4

Hopefully there's a simple function I've been missing.

Thanks in advance, R

Here's my formula... =SUM(S7)-T5

If that number is less than -100, I want it to show as blank.

Any help?

Right now, I'm trying to accomplish this by making a conditional format...meaning when my cell equals less than -100 I make the cell color and font the same (so it looks blank, but its not). When I print it, it still shows the negative value.


I need a formula to calculate Turn Around Time. Find below the sample data and details for your reference.

Received Date & Time: 10/29/2010 3:27:00 PM
Completed Date & Time: 11/1/2010 3:57:32 AM
Business Hours: 08:00 AM to 05:00 PM
Non Business hours: 05:00 PM to 08:00 AM
Weekdays : Monday to Friday
Weekends: Saturday & Sunday

If I calculate TAT for this time period it should show me 1 hour 33 minutes, why because business hours are closing by 5:00 PM on 10/29 so it should not calculate duration after 5:00 PM to until 08:00 AM on next day, however 10/29 is Friday so formula should calculate the duration from 10/29 Friday 3:37 PM to 10/29 5:00 PM and again it should calculate from 8:00 AM on 11/01 Monday and formula should skip Saturday & Sunday.

In this scenario I have completed the task before 8:00 AM on 11/01 so it should show duration of 1hour 33 minutes.

Please let me know if you need any more details

How do I calculate the number of batches per hour? Here's what I have so far:

Cell B5: start time: 4:15 formatted as 4:15:00 am
Cell B6: finish time: 6:15 formatted as 6:15:00 am
Cell B7: total time: 2:00 formula in cell: =TEXT(B6-B5,"h:mm")
Cell B8: total batches processed: 22 (this is entered manually)
Cell B9: batches per hour: formula in cell: =B8/TEXT(B7,"h")

as long as I have this formula in cell B9 the answer comes out correct which should be 11 per hour.
If the formula in B9 is B8/B7, the answer is 264.0, Is this because of the way excel is reading the total time or the total time is formatted as a time, not an actual number? Is this the correct way to solve the problem?
answer should be 11 per hour.

I am trying to correct a formula for a productivity worksheet in excel. The idea is that we would have the ability to input the number of hours worked each day and the number of direct hours (working with clients) per day. Then take the daily percentages and add them then devide them to determine the final productivity percentage for the week. Additionally not everyone works a full week so I would need it to only divide the percentages of the days that were completed. Any suggestions? or does anybody know a formula that would accomplish this already? I am good with basic excel and was able to identify a flaw in the current productivity sheet.

I see a formula that our Human Resources Department is using to annualize voluntary turnover.

It looks like this:


So if I substitute with some actual data:

=(6/((22+33)/2))*12/months the answer becomes 21.8% (as the annualized voluntary turnover rate).

What does the *12/months actually do mathematically? I cannot find it in the excel help files and have not been able to figure this out using math (on the calculator).


i've got the following problem:

I want users to double-click on a row on a protected sheet and then do some code based on the row-number of the clicked cell. I've protected the sheet because it contains a lot of formula's.

When a user double-clicks a row it triggers the code through the Workbook_SheetBeforeDoubleClick event.
After the code is executed Excel shows a message that the cell that was clicked was protected etc etc.

How can I prevent this message from popping up?

I've already tried

application.displaywarnings = false

but that didn't work


I have a spreadsheet where I need to calculate the increase in % one year over the other in column D for Eg if Profits are 95415 in Jan 2008 (Column B) and 80215 in Jan 2008 (Column C), then the % Increase will be (95415-80215)/80215 *100

I can calculate the formula for this, but the problem comes where for eg there is a loss in Jan 2008 for -95415 and there was a profit in Jan 2007 for 80215. How do I set up formula to take negatives & positives into account in calculating the increase or decrease/

Your assistance or anybody's on the forum will be greatly appreciated




Hi all,

I have written some code that when a button is selected will Refresh a Data Query Table and all of it's information. However, I seem to be getting issues, can some one point me in the right direction with the code?


.Sheets("Sheet 1").ListObject.QueryTable.Refresh BackgroundQuery:=False

When I recorded myslef doing this process it looked like this:


Sheets("Sheet 1").Select
Selection.ListObject.QueryTable.Refresh BackgroundQuery:=False

Many thanks!

Hi there

I am trying to calculate our On Time Delivery. I want this as a simple percentage of jobs. I have got this running in the following way:

Column M - Estimated Delivery dates
Column N - Actual Delivery dates
Column O - =IF(SUM(M2-N2)>0,1,0)

Then I have calculated On Time Delivery as: =SUM((SUM(O2:O252))/(COUNTA(N2:N252)))

This seems to work fine. My problem is, if we enter a date in Estimated without a corresponding Actual date, the formula for Column O fills out anyway and improves our On Time Delivery Percentage. How can I set this up so that the formula doesn't calculate if there is no data in Column N?

Any help much appreciated



i have a worksheet with formulas in 15,000 cells; i have set the calculation to maunal so that you have to press F9 to calculate the sheet. \

sometimes, it takes 45 seconds to calc the whole sheet, other times, it takes 5 minutes. how do i clear the cache, or what do i have to do so that it calcs 45 seconds each time.

i don't want the application to think, it would be better if those 15,000 cells can be returned in a fraction-of-a-second. any ideas/tips? thanks.

Is it possible to have numbers added to the same cell and have excel continue
to calculate the addition for me in that same cell......ex: I have the number
8 in cell d2 and I want to add the number 8 to that cell and have excel add
the 8 to the previous 8 for a total of 16 in the same cell.....the next time
I would add 5, and the total would be 21? Can this be done in a single cell?

I made a simple worksheet that we have been manually entering the time for employees, but there are too many errors (even with simple math). Can someone help me convert the time of ex: written 8-4:30 or 10-3 (meaning 8:00am to 4:30pm) where you have the total weekly hours? Right now I have a column for overtime. Is there a way to automatically calculate the over time also? The work day is 8-4:30 with a half hour lunch (lunch is not calculated into the hours, so you minus a half hour). 8-4:30 equals 8 hours. So, if a person works 8am to 6:30pm, how can I set it up where in the first row of time, I will type in 8-6:30pm. In the totals column to the far right, it will display 8 hours. In the (O.T.) column, it will display 2 hours.

This way, when I call in my payroll, I will have the total "regular" hours in one row and underneath, I will have the total overtime hours.

Or... does anyone have a better solution to keeping track of their hours?


I need information on how to enter the proper syntax (formula) so that excel
can calculate overtime hours. In california over 8 hrs in one day is
overtime. The 8 would be considered regular hours and anything over is OT.

Hi all,

The following code is placed in workbook 'A' and is used to open workbook 'B'. These workbooks will now always be housed in the same directory and i want to change the code to use a relative path reference by determining the path of workbook 'A'. here's what I had:

Sub income_statement()

Application.WindowState = xlMaximized
Application.Workbooks.Open "C:\Documents and Settings\.....\workbook B.xls", UpdateLinks:=xlUpdateLinksAlways

End Sub

could you suggest how to change this to use a relative path reference?

Happy Day to all,

Can you please help me,

A1= time in
B1= time out
C1= time in
D1= time out

I want to calculate the late and under time,
Office start at 9:am w/30 mins Grace period,
The break time is one hour only, please include over breaktime in calculation.
End of office hours 6:00 pm, strickly no over time

I would like to know how to make excel calculate which inventory is left in the FIFO method, quantities that are bought first are the first to be sold. Basically where the quantity and price is derived from.

For example:
bought 100 on FEB 1 $1
bought 500 on FEB 1 $1
bought 1000 on FEB 10 $1
sold 300 on FEB 12 $1.5
bought 100 on FEB 13 $1.1
sold 100 on FEB 13 $1.2
bought 1000 on FEB 14 $1
bought 400 on FEB 15 $1
sold 2000 on FEB 19 $1.5

For this, the formula/function would know that:
=>for the 300 sold on FEB 12, 100 bought on FEB 1 is depleted and 200 of the 500 bought on FEB 1 is depleted.
=>for the 100 sold on FEB 13, the 100 bought on FEB 13 is depleted
=>for the 2000 sold on FEB 19, it knows that:
==>the 100 bought on FEB 1, the 200 of the 500 bought on FEB 1, and the 100 bought on FEB 13 is depleted so it can't consider those quantities
==>it would consider the remaining 300 of the 500 bought on FEB 1, 1000 bought on FEB 10, and 700 of the 1000 bought on FEB 14

The remaining quantities that are left would be the remaining 300 of the 1000 bought on Feb 14 and the 400 bought on FEB 15.

I would like to know for each sold transaction, which quantities at which prices on which day were sold.

Thanks in advance!

In Excel I have been trying to find an easier way to calculate a time
difference where the times cross midnight. Example:
Start time: 23:50:00
End time: 00:15:00

How would you formulate an equation to determine the duration of time or
differnce between the start and end time?

Hi folks,

My problem is Tab no longer moves your active cell selection one to the right. It now moves to the last cell in your spreadsheet to the right (similar to CTRL+Arrow Key Right).

I seem to remember this being a simple setting you can change, but was unable to find it myself, or search the web for the way out. So my last result is asking the experts .

Do any of you know how to make it so Tab goes back to just moving one cell to the right again?

Thanks in advanced.

I have a requirement to change the panes in excel.
My excel file will contain more than one tab.
I have to free the first two lines in all the tabs except the first one.
I tried the following code.


ActiveWindow.FreezePanes = True

But in this I have to change the Active Worksheets in VBA, Which I want to avoid.
Is there any method to achieve this without selecting the cells.
Something like

xlsobj.Worksheets(1).Rows("1:2").FreezePanes = True

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