I need to take the value in two data columns A and C, get a percentage by dividing the current value of columns A and C by the top value (which is a total), and then average the two percentages and spit them out in column D. For example D2 should be (100(226/508)+(100(218/490))) / 2). I’d prefer to do this with one equation – is it possible?

```
A B C D
1 508 490
2 226 44.49% 218
3 229 45.08% 221
```

The formula you want is

```
=(100*A2/A$1 + 100 *C2/C$1)/2
```

and the select all of column D downwards and then edit->fill down

The relative reference A2 will change in each row to the new row but A$1 is an absolute reference and will stay as the value in row 1.

You can also do this with array formula that do the fill down for you. See MS article

Tags: excelexcel