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This post is all about using SUM.

When you are working with a lot of data, creating formulas manually can take a long time and is prone to mistakes.

There is a way to make formulas easier and quicker.

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Excel has over 450 pre-programmed functions. The simplest one that everybody learns first is SUM. SUM adds things up.

At the other end of the spectrum, the top-end functions are used by statisticians, mathematicians, engineers and scientists and tend to be quite specialised. However, there are still many that can be used by ‘ordinary’ folk!

For example,

=A1+B1+C1+D1+E1+F1+G1+H1

can be replaced with

=SUM(A1:H1)

This is easier to read and easier to maintain.

To see the full benefit, scale it up. Imagine if you had to add up 25 cells. Or 1,000 cells!

Excel even does the hard work of setting it up for you. You are given a tool called AutoSum.

The AutoSum button is ideal for novices who wish to learn and use some simple Excel functions. The AutoSum button provides a list of the five basic functions – SUM, AVERAGE, COUNT, MIN and MAX. The icon is the Greek Sigma symbol and looks like a sideways ‘M’ or a crooked ‘E’ (see below).

Using Autosum is quick and easy.

- Select the numbers to be added and the blank cell either to the right or underneath the selection.
- Click the Formulas tab.
- Click the AutoSum icon.

A SUM function is created in the blank cell (the last cell of your selected cell range). The selected cells are added together and the total is calculated.

By default the AutoSum tool creates a SUM function, which adds together the values in the selected cells. To see what the SUM function looks like, click on the cell that contains the total and study the formula bar.

The SUM function may be typed directly into a cell, rather than using AutoSum. This is quicker for experienced users.

Here’s the process to use once you’re a bit more confident:

- Select the blank cell where the total will be calculated (this is often - but not always - directly underneath the main data, or directly to the right of the main data).
- Type ‘=SUM(’
- With the mouse, select the range of cells you want to add up. Never type in the cell or cell range by hand.
- Type the closing bracket.
- Press Enter.

The structure of a SUM function is =SUM(number1, number 2 …) where each number may be a constant (e.g. 5), cell reference (e.g. A1) or cell range (e.g. A1:A3).

- Every item within the brackets is added up.
- Number1, number2 etc. are called arguments. A SUM function may have up to 32 arguments, each separated by a comma.
- Note that the function is preceded with ’=’ (as for formulas).
- Note the notation for a range – two cell references with a colon (‘:’) in-between.

The following formulas are valid examples of the SUM function.

=SUM(1,2,3)

=SUM(A1,A2,A3)

=SUM(A1:A3)

=SUM(1,A1,A5:Z10)

- Select the blank cell underneath the data.
- Click the AutoSum icon.
- Excel looks around the blank cell and if it finds data it will display the data range in the formula.
- If the data range is correct, press Enter to confirm the formula.

- Select the data you want to add up.
- Optional - you can also select the blank cell underneath - or not. Your choice.
- Using AutoSum by selecting the all the data cells and the blank cell underneath the data[/caption]
- Click the AutoSum icon. The total is added automatically.Using AutoSum by selecting the all the data cells and the blank cell underneath the data

When you select more than one blank cell going across the sheet, Excel knows that you want to add up columns of data, so it doesn’t ask you and puts the total straight into the cells.

- Select 2 or more blank cells underneath the data
- Click the AutoSum icon. The column totals are inserted automatically.
- Select 2 or more cells to the right of the data.
- Click the AutoSum icon. The row totals are inserted automatically.

And when you click AutoSum, all the totals are generated in one hit. Imagine how much time you could save if you have 50 columns and 1,000 rows

I hope you have seen how useful, how easy and how versatile the SUM function is.

Knock up a simple spreadsheet, enter some data - whatever you like - and use the AutoSum to generate some totals quickly.

Once you’re confident doing that, try selecting a blank cell and creating a SUM function manually, by typing it directly into the cell.

In part 3, I discuss 4 other basic formula functions that are also useful and easy to use - AVERAGE, MAX, MIN and COUNT

Did this clear something up for you? If so, please share on your socials and/or post a brief comment below.

Likewise, if something didn't make sense or you have a question, pop it into the comments below. I'll be waiting ...

Cheers. Here's to your learning and success. Enjoy the rest of your day.

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