Today we will learn a new and exciting excel formula – the all powerful SUMPRODUCT.
At the outset SUMPRODUCT formula may not seem like all that useful. But once you understand how excel works with lists (or arrays) of data, the SUMPRODUCT’s relevance becomes crystal clear.
SUMPRODUCT formula – syntax and usage
The sum-product formula syntax is very simple. It takes 1 or more arrays of numbers and gets the sum of products of corresponding numbers.
The syntax is =SUMPRODUCT (list 1, list 2 ...)
So, for ex: if you have data like {2,3,4} in one list and {5,10,20} in another list, and if you apply SUMPRODUCT, you will get 120 (because 2*5 + 3*10 + 4*20 is 120).
At this point it might seem like an almost useless function. But all that will change in the next 2 minutes, keep reading.
SUMPRODUCT and Arrays
Lets say you have a list of sales data with columns Name, Region, Product and Sales. Now, you want to know how many units the sales person named “Luke” sold. This is simple, you will write a SUMIF formula [examples] and use the Name column as “criteria range” and Sales column as “sum range”.
But, wait a second, you want to find how many units sales person “Luke” sold in the region “west”.
Hmm…. we have 2 options,
- Use an array formula
- Use a pivot table [what is a pivot table?]
Actually, there is a hidden third option, use SUMPRODUCT.
That is right, my friend, we can use SUMPRODUCT to do just this (and much more).
Using SUMPRODUCT as an array formula
Assuming, the data is in range A1:D10, with Name in column A, Region in B, Product in C and Sales in D, the SUMPRODUCT formula is,
=SUMPRODUCT(--(A1:A10="Luke Skywalker"),--(B1:B10="West"),D1:D10)
Okay, lets take a minute and try to understand WTF (what the formula) is doing.
- The portion
--(A1:A10="Luke Skywalker")is looking for Luke Skywalker across planetary systems in all universes 😉 It is going to give us a bunch of ONEs and ZEROs, one if the cell has Luke, Zero if the cell has something else. - The portion
--(B1:B10="West")is doing the same, but gets 1s when the value is “West”. - The portion
D1:D10is just returning all the sales figures. - When you put everything together and multiply, it just works. Why? That is your home work to figure out.
Share your SUMPRODUCT formula Tips & Tricks
SUMPRODUCT formula can do much more once you understand how it works. This post is meant to open the door for you. Go ahead and explore the possibilities, then come back and share your tips with us.
Recommended Reading
I suggest reading the excel array formula examples, sumif with multiple conditions and other excel formula tutorials.
This post is part of our spreadcheats series
8 Responses to “Pivot Tables from large data-sets – 5 examples”
Do you have links to any sites that can provide free, large, test data sets. Both large in diversity and large in total number of rows.
Good question Ron. I suggest checking out kaggle.com, data.world or create your own with randbetween(). You can also get a complex business data-set from Microsoft Power BI website. It is contoso retail data.
Hi Chandoo,
I work with large data sets all the time (80-200MB files with 100Ks of rows and 20-40 columns) and I've taken a few steps to reduce the size (20-60MB) so they can better shared and work more quickly. These steps include: creating custom calculations in the pivot instead of having additional data columns, deleting the data tab and saving as an xlsb. I've even tried indexmatch instead of vlookup--although I'm not sure that saved much. Are there any other tricks to further reduce the file size? thanks, Steve
Hi Steve,
Good tips on how to reduce the file size and / or process time. Another thing I would definitely try is to use Data Model to load the data rather than keep it in the file. You would be,
1. connect to source data file thru Power Query
2. filter away any columns / rows that are not needed
3. load the data to model
4. make pivots from it
This would reduce the file size while providing all the answers you need.
Give it a try. See this video for some help - https://www.youtube.com/watch?v=5u7bpysO3FQ
Normally when Excel processes data it utilizes all four cores on a processor. Is it true that Excel reduces to only using two cores When calculating tables? Same issue if there were two cores present, it would reduce to one in a table?
I ask because, I have personally noticed when i use tables the data is much slower than if I would have filtered it. I like tables for obvious reasons when working with datasets. Is this true.
John:
I don't know if it is true that Excel Table processing only uses 2 threads/cores, but it is entirely possible. The program has to be enabled to handle multiple parallel threads. Excel Lists/Tables were added long ago, at a time when 2 processes was a reasonable upper limit. And, it could be that there simply is no way to program table processing to use more than 2 threads at a time...
When I've got a large data set, I will set my Excel priority to High thru Task Manager to allow it to use more available processing. Never use RealTime priority or you're completely locked up until Excel finishes.
That is a good tip Jen...