Note: OFFSET is a volatile function, which means it recalculates with every change to a worksheet. With a modern machine and smaller data set, this should’t cause a problem but you may see slower performance on large data sets. In that case, consider building a dynamic named range with the INDEX function instead. In the example shown, the formula used for the dynamic range is: The first argument in OFFSET represents the first cell in the data (the origin), which in this case is cell B5. The next two arguments are offsets for rows and columns, and are supplied as zero. The last two arguments represent height and width. Height and width are generated on the fly by using COUNTA, which makes the the resulting reference dynamic. For height, we use the COUNTA function to count non-empty values in the range B5:B100. This assumes no blank values in the data, and no values beyond B100. COUNTA returns 6. For width, we use the COUNTA function to count non-empty values in the range B5:Z5. This assumes no header cells, and no headers beyond Z5. COUNTA returns 6. At this point, the formula looks like this: With this information, OFFSET returns a reference to B5:G10, which corresponds to a range 6 rows height by 6 columns across. Note: The ranges used for height and width should be adjusted to match the worksheet layout.

### Variation with full column/row references

You can also use full column and row references for height and width like so: Note that height is being adjusted with -2 to take into account header and title values in cells B4 and B2. The advantage to this approach is the simplicity of the ranges inside COUNTA. The disadvantage comes from the huge size full columns and rows — care must be taken to prevent errant values outside the range, as they can easily throw off the count.

### Determining the last row

There are several ways to determine the last row (last relative position) in a set of data, depending on the structure and content of the data in the worksheet:

Last row in mixed data with blanks Last row in mixed data with no blanks Last row in text data Last row in numeric data

### Dave Bruns

Hi - I’m Dave Bruns, and I run Exceljet with my wife, Lisa. Our goal is to help you work faster in Excel. We create short videos, and clear examples of formulas, functions, pivot tables, conditional formatting, and charts.