# Calculate The Average Of The Previous 12 Months

Oct 14, 2009
I'm trying to make a formula that will calculate the average of the previous 12months. The goal is to tie the formula to a reference cell that contains a date. Each time the date is changed by a user the calculation will be updated accordingly. Here is the CSE formula that I thought would work:

{=AVERAGE(IF($B$5:$B$53=B$2,OFFSET($C$5,(COUNT(C5:$C$53)-1),0,12,1)))}

I've also attached a sample file to illustrate the problem. The 'range' portion ($C$5,(COUNT(C5:$C$53)-1)[/b]of the Offset function was setup simply to get the 12 months which preceeded the reference date.

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Jul 9, 2012

I wrote code that works just fine, however, I realized there were parts of the data I was using that had 0's in it for holiday.

Bottom line, this is code that calculated the weighted average of prices for 12 months (12 rows across) and Drows across. I'm trying to use the "do while is empty" approach but can't get the syntax to work. Here's the code

Code:

For r = 1 To drows

Totwavg = 0

Tothours = 0

priceavg = 0

For n = 1 To ncontracts

[Code] .....

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Dec 10, 2012

see attached file. Need to find latest non blank value - in attached file it is highlighted in yellow. From there, want to summarise 26 weeks back so, in the attached file:

Row 2 would be finding 750 and summarised back 26 weeks from 30 sep 2012

Row 3 would be finding 2250 and summarised back 26 weeks from 2 dec 2012

Row 4 would be finding 5000 and summarised back 26 weeks from 4 nov 2012

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Feb 15, 2009

OK essentially this is my problem:

I have a daily spreadsheet, uou update for inputs and outputs each day and the spreadsheet gets to an overperformance figure (sorry if the spreadsheet is a lottle unclear, it is a simplified version)

On the first day of each month, the opening target is adjusted and you start again. The probelm is you dont know what the opening target is until roughly 21st of the month.

I created a macro that deletes the opening target and removes all the previous days before the start of the month.

The way i done this was:

Create a copy of "daily" tab, change b5 to equals c2 and copy and paste special as values. Then in d5-d58 and f5 - f58, vlookup values from old "daily" tab , and then copy and paste special as values. Then delete old "daily" tab and remname daily(2) as "daily"

What i have done is essentially created a new tab on 21st March, looking back to data only as far back as 1st Mar and the new opening bal and target is found. The macro can be used on the 21st of each month.

but...macro doesnt work, i have tried a few times and i think it is because i am vlookuping up data from a tab that i later delete...please help!! - thanks a mil to anybody that can give me a steer in the right direction.

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Jul 25, 2006

I have a worksheet that displays totals from a master worksheet. At the bottom of the summary I would like to have the three previous months totals displayed from one column. I know that I can achieve this "quick and dirty" by just using VBA to display what I want, but I wanted to see if there was a better way of achieving this.

I searched and came up with a formula like[code = TEXT(H4,"MMMM"[/code] This will diplay the month name like I want, but there are also three other cells that I need the previous months in. Is there some type of formula that will autmatically change these values once the date in cell H4 changes?

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Dec 8, 2013

I have subtracted two dates from B2 & B1 using DATEDIF() Function and the results are available in (B5) Year, (C5) Month and (D5) Days respectively. Now the problem is how to Subtract, Add days & Months using borrow, Carry forward to the previous cells (I need formula, function for the above). I have to take 30 days from month ie in C5 if the days (D5

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Jan 20, 2014

I need a formula to automatically change the summary column according to the month we are in.

Ie:

Last Months Data

Nov

Dec

Jan

Feb

1

8

1

7

4

7

9

2

9

'Last Months Data' column should show Dec. However, as we move into February and I complete the 'Jan' column, I would like 'Last Months Data' to automatically change to show Jan's data - is this possible?

I was previously told to use the following formula but this would automatically select the current months data and not the previous months data which is what i need - =INDEX(B2:L2,MONTH(TODAY()))

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Feb 26, 2006

B10 = AVERAGE(A1:A10),

B11 = AVERAGE(A2:A11), etc.

In case there are empty cells in the A-column, the result is not correct

anymore because AVERAGE does not take en empty cell into account.

For instance if A1:A10 are 1, A11:A20 are empty and A21:A30 are 2, the above

formula in B21 would give AVERAGE(A12:A21), or 2.

What I want is the average of the previous 10 meaningful cells so - in this

case - the average of A2:A10 and A21, or (9*1+2)/10 = 1.1

Question : Is there a possibility to calculate the average of the previous

10 meaningful cells (0 is meaningful, blank is not)

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Jan 21, 2012

I have data in "column F" that I want to highlight. The data is Listed verticaly from Row 1 to 424 in Column F; I want the spread sheet to hightlight the number when it exceeds the previous days 30,60, and 90 day average volume. How I can make this occur?

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Mar 7, 2009

The formula works but under very strict conditions. The spreadsheet has columns for all 12 months, a yearly total and an average column. The “If – Then” is for the average column for entire year. No matter what the month it will calculate the average using the appropriate number of months to divide by, now here’s the catch; each previous month has to have a number greater than “0” and luckily I have but if a previous month has a "0" it blows the formula out of the water. I had to split the into IF-Then into two sections because of the embedding limitations so when I have a lot of items that I need to do this for you can see I am having to reproduce this formula multiple times and tracking gets a little confusing. Example......

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Feb 13, 2014

Now I'm trying to do 12-month rolling average for my company data?

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Oct 7, 2008

how to calculate a six month rolling average for hours in AD column and AE column, this average would be entered in to AF1. the date column is AC the date is not consecutive it does miss days out.

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Mar 11, 2014

I am trying to calculate the average headcount for different categories (over a certain period of time, by product, by job type etc) and I want to do it using a formula instead of a pivot table.

I have this set of data with a detailed headcount for every month. And I can find out the total HC for different categories using sumif/sumifs but if want to find out the average for a certain period, I need to split that total to the number of months where I have a HC.

For example, if the HC per month would be:

May 2013 - 12

June 2013 - 10

July 2013 - none

August - 5

in a 4 months period I would have a total HC of 27 and the average would be 9 (27/3 - July shouldn't be counted). How can I get the average in a single formula?

Month

Type

L/H

Prod type

HC

[Code].....

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Nov 9, 2009

I need to be able to calculate age in months, and round whatever remainder to the middle of the month (.5). I am calculating z-scores and percentiles for in a childhood obesity project. The DoB and Date of measurements must be converted to read anything from 142.0 to 142.9 as 142.5.

This value will be used to look up the the appropriate LMS (Box Cox, Median, and Standard Deviation) in another excel table. I have to be able to compute age in months so 142.5, 143.5, 144.5, 144.5 etc. It is just not rounding off to the nearest half month.

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Oct 5, 2006

I was asked by a colleague how they could put a persons date of birth in one cell, todays date in another, and return their age in years and months. Accuracy to within a month. This is what I gave them.

=TRUNC((B1-A1)/365.25)&" Years "& ROUND(((B1-A1)/365.25-TRUNC((B1-A1)/365.25))*12,0)&" Months"

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Aug 21, 2007

I am building a template to auto populate budget value by straight line based on task start/end date criteria. some tasks could give me correct duration distribution, but some don't. I am looking for If function, which could give me correct monthly allocation budget. Here is an example of what I am trying to achieve. task 0110 duration is from 09/15/07 to 05/24/08, duration month is 8. budget $34,465supposed to be allocated to 8 month starting from Sept, 07. but my if logic return 9 month instead.

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Jan 7, 2014

In the file attached there is only the data to look at, though file is little bit lager.

Now in cell G10 I've got the stock forecast in 3 months time, this stock forecast is calculated from a date rounded to the closest month (according to my criteria), then the formula looks at the reference number cell D1 to work out the formula. All the steps are in the file.

In order to be more accurate my boss and I want to use the exact date, so that delete all the round month process. My intention is to use the day of the date and then make a fraction of the months to calculate the average. Taking into account that a month have as an average of 30.4166 days.

In the file I did an example, to clarify my messy explanation.

Cells B2, C2, D2 won't be needed in order to do so.

Please have a look at the file. At the end my intention is to to such a formula or a similar one. The formula should be an automatic one when typing dates in cell A10

The result of it is in row 31 and 32.

trial.xlsx

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Jan 28, 2009

I have a cell in which I will input the last day of a month (e.g., 1/31/09, 2/28/09, etc.) In another cell, I want Excel to show the last day of the previous month. Is there a formula to calculate this automatically?

I enter in Cell 1: 1/31/09

Excel calculates in Cell 2: 12/28/08

I enter in Cell 1: 2/28/09

Excel calculates in Cell 2: 1/31/09

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Jul 14, 2009

I have a row containing:

Date entered

Name

Date of Birth (DOB)

Occurrences of Name + DOB this Month

Occurrences of Name + DOB within last 3 Months

Occurrences of Name + DOB within last 6 Months

I can manage the occurrences this month but haven't a clue how to calculate the 3 and 6 months ones. I have attached a sheet.

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Apr 12, 2006

Start date: 12/04/2004

End date: 12/04/2006

The formula should give the answer to 24 months

Example 2

Start date: 12/04/2004

End date: 13/04/2006

The formula should give the answer to 25 months

When I use function =(YEAR(A4)-YEAR(A3))*12+MONTH(A4)-MONTH(A3), it does not

show 25 months for "Example 2" as it is still within the same month "April"

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Feb 1, 2012

I need to automatically calculate the number of months a deal runs through 2012 dependant on the start and end date.

I have attached a basic spreadsheet. Column C shows the results I would like the formula to calculate.

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Jul 30, 2007

Is there a way to add # of months to a date and then find out what would be the exact date?

For example if cell A1 = 04/30/07 and Cell B1 = 14 what is the statement that would give me 06/30/08 in Cell C1?

Also, how can I modify the statement if Cell B1 = 14.5 to get 07/15/08?

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Oct 5, 2007

Is there a formula which would show the number of months between two dates eg.

15-Jan-06 to 30-Nov-07 = 23 months

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Mar 26, 2009

I am trying to calculate Inventory Months Supply.

I can calculate the months suppply as shown below in multiple cells, but I am looking for a formula to do in one cell..

The correct result in this example is: 2.26048

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Dec 20, 2006

I have two columns with dates (and times) in that I am trying to define how many days, hrs and mins have elapsed i.e. A1 has 12/12/06 21:00, B1 has 17/12/06 21:00. C1 has B1-A1 and is custom formatted to show as dd"days" hh"hrs" mm"mins". In this case it will therefore show as 5days 0hrs 0mins. Which is correct.

However, if more than 1month has elapsed then the format m"m" d"days" h"hrs" m"mins" does not work. For example 17/03/06 03:00 to 20/12/06 07:00 shows as 10m 4days 4hrs 00min, which it clearly isn't.

I know the reason it does this is because it calculates the difference between the two times and adds that to it's 0 value, which in my format is 01/01/1900 00:00. therefore when it adds 277days (the answer) it becomes 04/10/1900 04:00, so my formatting is just calling the month value ('10') and the day value ('4').

I understand the reason it does this, 277 days on from 01/01/1900 is indeed Oct 4th, but 277 days on from 17/03/06 is not 10months and 4 days as there are different length months in between. It also seems to add a month on, possibly because the format for 'months' is between 1 & 12 and therefore cannot begin at 0?

Does anyone know if it's possible to force excel to work out the correct number of months and days have elapsed between two dates and not apply it to 01/01/1900? Or any other possible solution, maybe with a different custom format?

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Jan 5, 2012

I have a large sheet of daily river flows and precipitation amounts, over 40+ years.

I want to calculate the average flows in each month of each year (ie 11/1968, 12/1968, 1/1969 etc). Dates are in Col A, flows in Col D.

How to average a particular month over all years like so:

{=AVERAGE(IF(MONTH(A2:A15282)=1,D2:D15282))}

But I don't know how to average per month of each year, or how to make a formula that will allow me to quickly calculate the averages of 100s of months.

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Sep 13, 2009

I am using the following formula to calculate years months and days in Excell 2007

=DATEDIF(C7,D7,"y") & " yrs, " & DATEDIF(C7,D7,"ym") & " mths, " & DATEDIF(C7,D7,"md") & " days"

C7 3/24/04

D7 1/4/08

What is returned is 3 years, 9 months, 136 days

How might if fix it show the correct days?

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May 19, 2014

I am trying to calculate the number of months in a specific year between two dates.

For example.

Start date 01/06/2012

End Date 01/02/2013

Number of months in 2012 = 6

Number of months in 2013 = 2

How can I write a formula to give me the answer of 6 & 2 from the start and finish dates?

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May 15, 2009

I am working on a sheet that will allow a user to enter a start month (from a pre-defigned drop down list) and an end month (again from ddl). What I need to calculate is in what months the employee worked in so I can calculate their salary cost by quarter.

It can populate other cells in order to do the calculation if needed. So, for example if an employee started in May, and worked until December, I need to calculate that he worked 2 months in Q1, 3 months in Q2, 3 months in Q3, and 0 months in Q4. Our fiscal year is April to March.. ;-) I have thought of several options, but none of them have worked 100%.

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Dec 31, 2013

In one column I'll have a list incrementing in 1w,2w,3w,1month and I want to be able to count the number of days that have elapsed till the latest cell. Right now I'm just winging it by saying there's always 31 days in one month using a COUNTA function, but I need it to be accurate.

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