Thursday, February 26, 2009

Microsoft Exel's SUMIF function

By Carol Alexander

Most Excel users have encountered the SUM function. It is one of the most widely used functions within the program. And most Excel users will also have used the IF function at some stage. The SUMIF function is really just a combination of SUM and If which allows us to calculate the total of all cells within a given range that match a certain condition.

For example, let's say that, in a "Sales" worksheet, we have a breakdown of the sales of each individual salesperson. We then want to create a summary of these figures in a "Branches" worksheet in which we want to create a total sales figure for each branch; so our "Branches" worksheet would have two columns: "Branch" and "Total Sales". We can use the SUMIF function to calculate the figures in the "Total Sales" column.

A good first step would be to create named cells so that we can refer to these names in our formula. To name a range of cells begin by selecting the range then click on the name box in the top left of the worksheet, enter a name then press the Enter key.

Once we have inserted the names of all the branches in the first column of our "Branches" worksheet, we need to highlight the first cell in the "Total Sales" column, adjacent to the cell containing the name of our first branch; let's say, for example, our first branch is "Birmingham". When using a function for the first time, it's useful to use Excel's Insert Function facility. To access this, simply click on the Insert Function button on left of the formula bar. The SUMIF function lives in the "Math and Trig" category. Scroll down the list, highlight SUMIF and click OK. Excel will then prompt you for the three arguments required by the SUMIF function.

The first argument is the range of cells to be evaluated. In our branch sales example, this would be the column containing the name of the branch. If we have named this column, we can insert the name by clicking on "Use In Formula" in the Formulas Tab at the Excel Ribbon. This is a drop-down menu containing every name in the workbook.

The second argument is the criteria we want to match. In our example, is simply the contents of the cell in the adjacent "Branch" column, which in this case contains "Birmingham". We can click in the cell to pick up the reference.

The final argument is the SUM range and, in this case, it will be the column that contains the cells that we want to actually total; namely, the sales figures. Again, if we have named this column, we would click on "Use In Formula" and choose the name that we created earlier. Having specified the three arguments we click OK and Excel creates the formula.

It's now safe for us to copy the formula down. As we copy the formula, the cell reference of the adjacent column containing the branch name will change but the two named ranges will remain the same. To copy the formula down, position the cursor on the AutoFill handle in the bottom right of the cell and then either drag or simply double-click. - 16039

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