Step 1 - Create hours in week and compare to time ranges. This part of the formula creates Excel date and time values based on hours, it then compares these values with the time ranges in the Excel defined Table to determine if outside range. Open Excel and enter the first two values of the series you want to autofill in a row or column. Select both cells and in the floating options bar, tap Fill. You will see the border around the cells change so that there is an arrow pointing left, and one going down. The arrows indicate which cells you want to autofill more values of the series in.

The Excel Autofill feature can be used to populate a range of cells with either a repeat value, a series of values, or just a cell format.

To use the simple Excel Autofill:

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1. Enter a value into the start cell;
2. Use the mouse to drag the 'fill handle' (the small black square at the bottom right of the start cell) across the range of cells to be filled;
3. When you drag the 'fill handle' across the range of cells to be filled, Excel will fill the selected cells, by either repeating the value in the first cell or by inserting a sequence from the first cell value (e.g. 1, 2, 3, ...);
4. Click on the 'Auto Fill Options' box, which will appear at the end of your selected range of cells. This will give you the following different options:

• Copy Cells - copy the initial cell across the selected range;
• Fill Series - fill the selected range with a series of values (typically incrementing by 1), starting with the initial cell value;
• Fill Formatting Only - fill the selected range with the formatting, but not the values of the initial cell;
• Fill Without Formatting - fill the selected range with values, but do not copy the formatting from the initial cell.

Select the option that you required for the filled cells.

Autofill Using More Than One Starting Cell Value

If you want Excel to recognise a series that is not a simple increment by 1, this can be done by typing the first two values of your series into the first and second cells of a range. Select both of these cells and again, drag the fill handle across the range to be filled. Excel will automatically recognise the pattern from the two initial cells and continue this across the selected range. Using this method, you can get Excel to fill cells by increments or decrements of any number (e.g. 2, 4, 6, 8, ...).

Alternatively, if you want Excel to fill cells with repeated alternating values (e.g. 1, 2, 1, 2, 1, 2, ...) you can start off the pattern in the first two (or more) cells, then, with the initial cells highlighted, drag the fill handle and then click on the 'Auto Fill Options' box. Within this box, select the option 'Copy Cells' to repeat the initial cell values across the selected range.

Autofill Dates & Times

As dates and times are stored in Excel as numbers, these can also be used with the Excel Autofill.

By default, if you just type in a single date or time and drag the fill handle, dates and times will complete in a series, by adding one day (for dates), or one hour (for times). However, as with simple numbers, you have the option of clicking on the 'Auto Fill Options' box, to select a different type of Auto fill.

Times have the same four Auto fill options as are shown above, for simple numbers (i.e. Copy Cells, Fill Series,Fill Formatting Only, Fill Without Formatting). However, for dates, there are additional Auto Fill options. As well as the four options for simple numbers and times, there are also the following:

• Fill Days - Look for a pattern in the day when filling the selected cells;
• Fill Weekdays - Look for a pattern in the day when filling the selected cells, but do not include Saturdays or Sundays in the series;
• Fill Months - Look for a pattern in the month when filling the selected cells;
• Fill Years - Look for a pattern in the year when filling the selected cells.

Autofill Text Values

The Excel Autofill will generally fill a column with text values by repeating the value(s) in the first cell(s). However, there are some text values that Excel recognises as part of a series. These are:

Autofill Functions and Formulas

The Excel Autofill feature also works with functions and formulas in Excel. However, with this type of Autofill, there is no 'series fill' option. Instead, Excel observes the rules of Absolute and Relative Cell References (i.e. if a row or column reference is preceded by a $ sign, excel will keep the reference constant as the formula is copied to other cells; Otherwise, the row or column reference will be adjusted as the formula is copied to other cells.

Horizontal and Vertical Autofill

As well as working down a column, the Autofill feature also works horizontally, across rows.

Simply drag the fill handle across the cells that you want to populate.

Autofill Multiple Rows or Columns Simultaneously

The Excel Autofill can also handle data in more than one row or column. This is shown in the example below, in which cells A1 and A2 have numeric values 1 and 2, and cells B1 and B2 both have the numeric value 3.

Highlighting cells A1 to B2, and then dragging the fill handle down columns A and B causes the Autofill to complete both columns with their own series (i.e. column A completes with 1, 2, 3, 4, ..., and column B completes with 3, 3, 3, 3, ...)

Double Click on the Fill Handle

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For speed, you can Autofill a column by double-clicking on the fill handle of a highlighted cell (or range of cells). If the cells below or adjacent to the highlighted cell (or range) contain values, double clicking the fill handle causes the Autofill to fill down the current column until it reaches the end of the current data range.

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A video on the Excel Autofill is provided on the Microsoft Office Support website.