Today we will learn how to calculate weighted average in Excel with percentages.
What is weighted average ?
Weighted average or weighted mean is defined as [from wikipedia],
The weighted mean is similar to an arithmetic mean …, where instead of each of the data points contributing equally to the final average, some data points contribute more than others.
…If all the weights are equal, then the weighted mean is the same as the arithmetic mean.
Why should you calculate weighted average?
Well, it is because, in some situations normal averages give in-correct picture. For eg. assume you are the CEO of ACME Widgets co.. Now you are looking annual salary report and being the numbers-gal you are, you wanted to find-out the average salary of your employees. You asked each department head to give you the average salary of that department to you. Here are the numbers,
Now, the average salary seems to be $ 330,000 [total all of all salaries by 5, (55000+65000+75000+120000+1200000)/5 ].
You are a happy boss to find that your employees are making $330k per year.
Except, you are wrong. You have not considered the number of employees in each department before calculating the average. So, the correct average would be $76k as shown above.
How to Calculate Weighted Average in Excel with Percentages
There is no built-in formula in Excel to calculate weighted averages. However, there is an easy fix to that. You can use SUMPRODUCT formula. By definition, SUMPRODUCT formula takes 2 or more lists of numbers and returns the sum of product of corresponding values. [related: Excel SUMPRODUCT Formula – what is it and how to use it?]
So, if you have values in B4:B8 and the corresponding weights in C4:C8, you can use SUMPRODUCT like this to get weighted average.
=SUMPRODUCT(B4:B8, C4:C8)
Caution: However, the above method works only if C4:C8 contains weights in percentages(%) totaling to 100%.
WAvg Formula Pattern (use this with your data)
=SUMPRODUCT(<your values>, <your weights>)What if my percentage weights don’t add up to 100%?
May be your weights are more than 100 percent. Or may be they are less than 100 percent. In both cases, you can use the below formula variation.
=SUMPRODUCT(B15:B19, C15:C19) / SUM(C15:C19)
The idea is to divide the total of weights with the SUMPRODUCT result so that we can adjust Weighted Average as the weights don’t add up to 100 percent.
WAvg Formula Pattern when weights don’t add up to 100 percent
=SUMPRODUCT(<your values>, <your weights>) / SUM(<your weights>)Weighted Average when you have counts instead of weights:
If you have count of observations instead of weights, you can still use the SUMPRODUCT formula to calculate weighted average in Excel.
Here is the formula for above example:
=SUMPRODUCT(B26:B30, C26:C30) / SUM(C26:C30)
Notice that this formula is same as the formula for weighted average with weights not adding up to 100 percent.
WAvg Formula Pattern when you have counts instead of weights
=SUMPRODUCT(<your values>, <your counts>) / SUM(<your counts>)Weighted Average with Extra Conditions
Let’s say you have city wise observations and weights. And you want to calculate the weighted average, only for Boston values. In this case, you can use a variation of the formula like below:
=SUMPRODUCT((C5:C16)*(B5:B16=F5),D5:D16)/SUMIFS(D5:D16,B5:B16,F5)
How does this formula work?
- SUMPRODUCT calculates the total value for BOSTON by summing up C5:C16 (value column) where B5:B16 is Boston (highlighted portion of the formula) and multiplies that with the counts.
- So in the above example, this will just give us the total of Boston – ie 218,600
- We then divide this with the total count of Boston (using the SUMIFS formula) – ie 400
- This results in the weighted average for Boston values alone – ie 546.50
For more information on how the conditions work inside SUMPRODUCT formula, please read this article.
Download Weighted Average Calculation Example Workbook:
In this workbook, you can find 4 examples on how to to calculate weighted average in excel. Go ahead and download it to understand the formulas better.
Weighted Average in Excel – Formula Explained
Here is a video with Weighted Average formula explained. Please watch it below to learn more. Alternatively, head to my YouTube page to see the weighted averages in Excel video.
In Conclusion
Weighted averages are a great way to explain data and every data analyst should know how and when to use them with their data. Apart from Weighted Average, I suggest learning how to use moving average and average of top n values. These will help you explain the data and trends to your audience better.
Do you use Weighted Mean / Weighted Average?
What do you use it for? What kind of challenges you face? Do you apply any tweaks to weighted average calculations? Please share your ideas / tips using comments.
54 Responses to “6 Tips for Writing Better VLOOKUPs”
Hi, I am loving the VLOOKUP series this week. 🙂
Could you please expand a little on why you don't recommend using 1 or 0 in place of true or false? I am in the habit of doing this.
"You can even omit the last argument if it is 0"
Excel's default for the last argument is TRUE. Because of this, it's dangerous to omit the last arguement. I would use either FALSE or 0. Never omit if you want an exact match.
Nice series, Chandoo!
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Your readers may be interested to know that the quickest formula method to do lookups in Excel is an array-entered INDEX.
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This is one of the many topics covered in the Excel Hero Academy:
Excel Hero Academy
.
Regards,
Daniel Ferry
Excel Hero Academy
Dear Daniel,
I had used index-match with absolute reference for the ranges but when I am resorting the table the formula is not recalulating the lookup value combination.
Regards,
Anish Menacherry
@Anish
Can you post the question at the Chandoo.org Forums
http://chandoo.org/forum/
Please include a sample file so we can review the issue
1. Never use VLOOKUP/HLOOKUP - Always use Match /Index
2. Sort your data before performing a Loookup
3. Use 1/-1 option Match as it is at least 10 times faster than the 0 option- But modified to perform an exact match rather than an approximate match as described below
a) A Column containing a Match Fucntion to Find the Position with the 1/-1 option
b) A Status column containing a Index to check the status (present/not present)
c) Multiple array entered Index colums to pick
In tip number 5 you state, "you can even omit the last argument if it is 0" which is not correct. If you omit the last argument, Range_Lookup, is TRUE, as Mike Alexander points out.
Excellent series - Need some help from the expert. how easy it is to add/expand a named range in a lookup formula?
@Mike & Gregory: I am sorry for the confusion. The formula =VLOOKUP(value, range, column #) assumes last argument as TRUE.
Where as the formula =VLOOKUP(value, range, column #, ) assumes last argument is blank or empty which internally gets treated as 0.
And that is what I mean by you can even omit last argument. I state that "Remember, you must place a comma (,) after the column number if you are planning to use this." otherwise, this will not work.
@Andrew: I suggest not using 0 or 1 as they are more cryptic and lead to confusion when your spreadsheet gets to someone else's hands.
@Daniel: Thanks for that.
@Sam: Good tips. I would just add that using VLOOKUP / HLOOKUP is ok as long as they solve the problem you have and do not take too much time. The performance improvements you get with array entered index or other techniques are minimal when dealing with small and moderately sized data sets.
@Sundeep
Very easy
Have a read of: http://chandoo.org/wp/2009/10/15/dynamic-chart-data-series/
Particularly Point 3. Create a new named range and type OFFSET formula
@Hui - Thanks.
If I have a large workbook with many Vlookups and if I change the range to named range...is there an easy way to change all the formulas? It is more of wishful thinking than a question 🙂
@Sundeep... You can use Apply names from formulas ribbon to apply names to a selected range. This technique works when the ranges are mapped to static references. Dynamic refs. thru OFFSET are bit more tricky.
You can use the find / replace to automatically replace all $A$1:$C$1000 with dynamic range lstData. See this: http://chandoo.org/wp/2009/02/17/spreadsheet-formulas-edit/
@Sundeep
On the Formulas Tab, Click on the Drop Down on the Define Name button and select Apply Names
Select one or all Named Ranges and apply
Excel will go through your worksheet/s and change the Ranges for Named Ranges.
i cannot believe i missed the new to 2007 formula "IFERROR". your mention of this will help reduce the number of characters in many formulars i use (with "ISERROR") by at least 40% along with commensurate reductions in spreadsheet size and calculation speed... not to mention future reduction in typing and debugging time in formulas. thank you. and thank excel.
Newbie here.
I am not able to understand the Tip#1. Use of "val", "tbl". I tried and it kept on giving error.
Chandoo's Tip#1: =VLOOKUP(valSalesPerson,tblData,3,FALSE)
Does it need column headings? And how do you l lookup the value I am looking.
Thanks in advance.
[...] 6 VLOOKUP Tips [...]
[...] VLOOKUP, INDEX, and MATCH: Useful for looking up any text values [...]
I need some help with creating a formula. I have a list of names on tab 1. (About 20) On tab 2 I have a list of names and there total sales (About 3,500) I created a name range for both the first list of names on tab 1 (Producer) and a name range for the second list on tab 2 (Agent_List) The sales on tab 2 for each producer is in the 7th colume.
I need the formula to identify name of Producer (Tab1) from the Agent_List and then choose the total sales for that producer.
This is the formula I put together and I only get #REF!
VLOOKUP(PRODUCER,AGENT_LIST,7,FALSE)
@JimH
I assume you are adding a column next to the Agent_List on Tab 2 and looking up values from the Agent_List and retrieving values from the Producer list
.
So the format for your equation will be:
=VLOOKUP(A2,Producer,7,FALSE)
or
=VLOOKUP(Agent_List,Producer,7,FALSE)
.
Note that the named range Producer must be at least 7 columns wide, not just Column A or you will get the #REF! error also
Hi
Can anyone please help or this totally impossible in excel? I am trying to do a vlookup with a range of cells that contains "comments" in them and unsuccessful.
Thank you
@Lala
You cannot search within comments unless you use VBA
My tips are:
Pay attention to data types - no fly if mixing text and numbers. I run into this problem a lot with files downloaded from access that have a tendency to mix data types on me when it hits excel.
Pay attention to $ - If pulling from the same workbook, $ won't auto fill on your range and you will potentially miss hits.
Yeah, the data type mixing has bitten several folks I work with in the rear.
EG: I work at a company where marketing source codes are 10-alphanumeric. But, some codes are like "12345" while others are "123abc". When access or sql dumps to excel, the numerical ones convert to numbers while the text ones stay text.
So, what I do is create a reference column next to them in which I do a =TRIM([column]). Trim not only removes front/back spaces, it converts a value to text data type. This is useful, b/c sometimes sql db admins will store data with a fixed string length (eg: a column may get stored as char(50), which means it will have 50 chars no matter if it has to add extra spaces at the end to pad it out.) When you dump this to excel, the extra spaces remain at the end. So, the Trim command not only converts numbers to text, it removes padded spaces at the end. Very useful when working with sql dumps.
I have two sheets, in first sheet i have given a criteria of month (like jan, feb), then on another sheet i have month wise sheet like
jan feb mar
a 2 5 8
b 5 9 8
c 9 12 89
now i need in first sheet if i give criteria jan then answer is 2+5+9, or if i give feb then answer is 5+9+12 and like that, how to get that??
I am pretty well versed in VLOOKUP but I have a challenge I can't figure out. When I complete the VLOOKUP in one cell, it works fine. When I drag the formula down (using $ where necessary) the value from the first LOOKUP populates in the new cell. If I double click on the cell and hit 'enter' then the correct value is pulled in from the vlookup. Any suggestions why the formula isn't executing correctly until I hit enter?
@Nicole
It sounds like Calculation is set to Manual
Goto the Data Tab Calculation and set it to Automatic
Absolutely FANTASTIC!! Thank you so much. Slight variation on my version of Excel. I had to go to Formulas Tab then to Calculation sub-tab, Calculation Options, change setting to Automatic. Thank you thank you thank you. Saved me hours of more frustration!
[...] than maybe sorted, which it usually is anyway).Use COUNTIF or MATCH to speed up calculationAs many others have pointed out, VLOOKUP returns #N/A if the lookup value is not found. Instead of using a [...]
I have more than 2 columns in a table I'm so confused cuz the results i get is #N/A =(
I have a 2-sheet database. Sheet 2 has a list of Accronyms in column A and their description in column B. On sheet 1, column A is where you input your Acronym. In column B, the formula takes Acronym from column A, looks it up on sheet 2, and displays it on column B.
After some research, I found how to make custom text if there is not a match on the Acromyn. The question i have is, is that when there is no text in comumn A, sheet 1, column B, sheet 1 displays my custom text "ABBREVIATION NOT FOUND". I'm trying to write a forumla that leaves column B blank unitl there is an input in column A.
This is my current forulma:
=IF(ISNA(VLOOKUP(A4,Description!A:B,2,FALSE)),"ABBREVIATION NOT FOUND",(VLOOKUP(A4,Description!A:B,2,FALSE)))
Any help out there?
Thanks,
Jerome
Hi Jerome... Thanks for your question. Try this formula instead:
=IF(A4<>"", IFERROR(VLOOKUP(A4,Description!A:B,2,FALSE),”ABBREVIATION NOT FOUND”), "")
Works in XL 2007 or above. For older versions use this:
=IF(A4<>"", IF(ISNA(VLOOKUP(A4,Description!A:B,2,FALSE)),”ABBREVIATION NOT FOUND”,(VLOOKUP(A4,Description!A:B,2,FALSE))), "")
Btw, to learn more about IFERROR see this: http://chandoo.org/wp/2011/03/11/iferror-formula/
I have 2 worksheet, the first one is like this:
A B C D
1 DOG 1 BROWN
1 DOG 2 WHITE
2 CAT 1 SMALL
2 CAT 2 MEDIUM
2 CAT 3 BIG
THE SECOND WORKSHEET IS LIKE THIS:
A B C D
ENTER# fORMULA 1 WITH VLOOK ENTER # FORMULA 2
(RETURN ANIMAL) RETURN TYPE
FOR EXAMPLE i NEED WORKS LIKE THIS:
2 CAT 2 MEDIUM
FIRST FORMULA IS EASY NOT PROBLEM. bUT FOR THE SECOND i DO NOT FIND HOW TO DO IT. PLEASE HELP.
This would be how I would handle your second formula, in your first worksheet, I would insert a column between C & D. In that column I would have a formula to concatenate the values in column A & C (example =concatenate(a2,c2)) which would result in:
A B C D E
1 DOG 1 11 BROWN
1 DOG 2 12 WHITE
2 CAT 1 21 SMALL
2 CAT 2 22 MEDIUM
2 CAT 3 23 BIG
Then in the second worksheet formula 2 would be:
=vlookup(concatenate($a2,$c2),AnimalType columns D&E,2,false)
Great Stuff Chandoo
In your 6th post you say use SUMIF instead of VLOOKUP as it runs faster.
What if you have a spread sheet with repeated data and you only want to pull one value back?
would it be best to use a simple VLOOKUP
or something like: IF(COUNTIF < 2, SUMIF, VLOOKUP)
I have set COUNTIF < 2 (not just = 1) to take advantage of the fact that if COUNTIF = 0 you won’t get an error
Now if only you could use the column header name instead of the column index number in the VLOOKUP function.
Scenario: I have a list/table in one spreadsheet that I use to lookup values in other spreadsheets. If I insert columns in my list/table, I have to go into the other spreadsheet(s) and increment the VLOOKUP formulas' column index number to capture the right column of values.
Example: if I inserted a column in Table1, my formula:
=VLOOKUP(A1,Table1,2,FALSE) would have to change to:
=VLOOKUP(A1,Table1,3,FALSE),
it would be so much better if you could code something like:
=VLOOKUP(A1,Table1,Table1[price],FALSE)
If my lookup result is numeric data I could use sumif as suggested and use the list/table references; is there a similar function I can use for alphanumeric data lookups that uses list/table references?
[…] Read more – 6 VLOOKUP tips […]
tip:
you can use dynamic column reference for your look up if you want to pull multiple column values from another sheet with the same row reference without having to rewrite the the formula, e.g.
range a1:d1 = "header", 2 , 3, 4
b2 = vlookup($a2, LookUpRange, b$2, 0)
c2 = vlookup($a2, LookUpRange, c$2, 0)
b3 = vlookup($a3, LookUpRange, b$2, 0)
the above will bring back the value two columns away from LookUpRange in b2, 3 for c2 and 4 for d2 for the same reference, a2. By freezing just the column for your lookup reference value and just the rows for your column reference, you can drag your forums both down and right while keeping all reference both constant and dynamic... as oxymoronic as that sounds.
my TIP, building on what Andy says above re using a dynamic refrence: if you use the column functon in the header row - should someone add extra columns to the source sheet your lookup will adapt and still return the right result.
With the below formula I am getting "too many arguments for this function. any help?
=IFERROR(VLOOKUP(RIGHT(M3,7),notes!A:A,1,FALSE),"Failure to process correctly",IFERROR(VLOOKUP(RIGHT(n,2),notes!A:A,1,FALSE),"Failure to process correctly"))
Chaz - IFERROR only requires 2 arguments, you have entered 3 (the vlookup, the error message, the 2nd IFERROR).
Change your formula to the following:
=IF(isERROR(VLOOKUP(RIGHT(M3,7),notes!A:A,1,FALSE)),”Failure to process correctly”,IFERROR(VLOOKUP(RIGHT(n,2),notes!A:A,1,FALSE),”Failure to process correctly”))
Ian
Hmm, I'm not sure my formula will return the required output.
This tests if there is an error in the 1st vlookup, then checks the 2nd, and only returns the error message if both vlookups are errors. Is that what you wanted to do?
=IF(isERROR(VLOOKUP(RIGHT(M3,7),notes!A:A,1,FALSE)),IFERROR(VLOOKUP(RIGHT(n,2),notes!A:A,1,FALSE),”Failure to process correctly”),VLOOKUP(RIGHT(M3,7),notes!A:A,1,FALSE))
I am trying to use a vlookup with a named range for the lookup array. This works fine. However now I would like to replace this named range with a cell reference (which obviously contains the name of the named range) but get a N/A error message. Is this really not possible?
vlookup ( A1, named range, 2, 0 ) . This works
vlookup ( A1, F1, 2, 0 ) . Where cell F1 contains the the text with named range. This does not work.
Any tips or thoughts would be appreciated. Thank you in advance
@Erik
Use: vlookup ( A1, Indirect(F1), 2, 0 )
Works like a charm. Thank you!
Some opinions on the pros and cons of using named ranges on http://www.excelvlookuphelp.com along with a few other hot tips
Hello,
Chandoo,
Can u explain me how to use vlookup formula in 2 sheets in one excel workbook.
Hi am Using Index match function to overcome the limitation of Vlookup. But I am failed to get the same result as i get in Vlookup. in vlookup as we can expand the Columns of Vlookup in one single shot. Like Vlookup($A4,A1:G9,3,0) but same Result i Not get in Index match Function. Please help
@Satish
I will suggest that your list is unsorted and it is possible that VLookup is returning a wrong answer
Can you post a question at the Chandoo.org Forums
http://chandoo.org/forum/
Post a sample file and someone will review
I want to upload a Sample file Contain my Question. but i can't see and upload file button on the page. Please Tell how to upload the File
@Satish
You can't upload a file here
But you can on the Forums
Goto:
http://chandoo.org/forum/
Select a Forum
Start a New Thread
Upload a File, is at the Bottom next to the Post Button
Refer: http://chandoo.org/forum/threads/posting-a-sample-workbook.451/#post-73705
thanxx... Soon i will Upload It.
Dear Excel super-users,
Sourcing data from different sheets.
I'd like to specify in the vlookup formula which sheet to source data from.
This source sheet will change depending of the name of the person selected in a specific cell C1 on the sheet where the vlookup formula is being run from.
I'd be grateful for any tips to achieve this.
Regards,
Sean
dear sir /madam
please proved me lookup formula
and exp--------- insert picture formula attched excel sheet
Us the Column formula in place of the 3rd argument will save you time when you want to bring in all data columns!