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# Creating a formula to autofill a range of cells based on input

Hello,

I am trying to create a formula that takes the input from a cell and fills a range of cells based on the numerical value entered. I'm not sure if there is a default function to a

EX: If cell B1 contains a numerical value of 5, Cells A2:A would increment by 1.

A                       B   C   D   E

1   | Enter a number:  5

2   |   1

3   |   2

4   |   3

5   |   4

6   |   5

7   |

8   |

9   |

10 |

12 Replies
best response confirmed by tazewellj (New Contributor)
Solution

# Re: Creating a formula to autofill a range of cells based on input

Hello @tazewellj,

Enter this formula into cell A2 and use cell B1 to input your number:

=IF(ROW(A2)-1>\$B\$1,"",ROW(A2)-1)

Then copy the formula down as necessary.

Hope this helps!
PReagan

# Re: Creating a formula to autofill a range of cells based on input

@PReagan thanks for your quick response. Unfortunately this always returns a value of 1 in cell A2. This is a great start, but I am trying to create a formula that will fill a range of cells. For instance, if I the value 3 in cell B1, I would like cells to filled as followed:

A2 1

A3 2
A4
3

My goal is to have a numbered rows based upon user input.

Thanks,
tazewellj

# Re: Creating a formula to autofill a range of cells based on input

@PReagan I'm not sure the ROW function will achieve this. The ROW function returns the value of the row. The formula you provided will always return a value of 1 no matter what.

# Re: Creating a formula to autofill a range of cells based on input

The row function Row(A2)-1 will always be equal to 1 for cell A2 unless B1=0. When you copy the formula down to cell A3, the function becomes Row(A3)-1=2. Copied down again to cell A4 the formula becomes Row(A4)-1=3. The formula continues to add one to the previous total until it has reached a value greater than B1 at which point “” will be returned.

Unless I am misunderstanding your problem, this should return your desired result.

# Re: Creating a formula to autofill a range of cells based on input

@PReagan your right! This worked like a charm. I needed to drag the formula down for it to apply the way I wanted. Thanks so much for you assistance.

Happy to help

# Re: Creating a formula to autofill a range of cells based on input

There is a default function that does precisely what you have specified but, unfortunately, it is only just now becoming available and that to Office 365 users only.

If you name the number cell 'n' (as you describe the problem it is cell \$B\$1 but there is no reason it shouldn't move), the sequence {1; ...; n} is generated by

= SEQUENCE( n )

The Dynamic Array formula is entered into a single cell and spills down to display the values.  To generate a horizontal number sequence the dimensions of the output range change to read

= SEQUENCE( 1, n )

There are further parameters that specify the start value and the step, 1 being the default in each case.

# Re: Creating a formula to autofill a range of cells based on input

Hello @PReagan

Thanks for the earlier response .. this was also something i was looking for but i had an additional requirement.

In the response it was mentioned that we have to drag the formula down to the required number of cells in column A.

However can it be possible that say N number of Rows automatically fill based on the value of N entered in B2 e.g. if a person enters 512 in B2, A2:A513 all gets a number starting from 1 and incremented downwards .. ( without have to drag the formula all the way to A513 ) the number N could be any value (no max limits)

# Re: Creating a formula to autofill a range of cells based on input

1. Take your existing formula and fill it down beyond your range of interest;  a slight modification would return "" for values you do not require.
2. Buy a copy of Office 365 and set it to insider or monthly update so that you can use the dynamic arrays and the SEQUENCE function
3. Write a VBA macro to rewrite the values when N changes in cell B2
4. Use PowerQuery to write the sequence when the data is refreshed

# Re: Creating a formula to autofill a range of cells based on input

Thanks @Peter Bartholomew for a quick response, i was looking for a more generic solution which would not be dependent on the office version or VBA.

I dont think this is easily doable, please let me know otherwise

# Re: Creating a formula to autofill a range of cells based on input

This would require VBA if you wish to fill N number of cells with the formula.

Alternatively, as @Peter Bartholomew suggested, you may "take your existing formula and fill it down beyond your range of interest;" (for example cell A1048576) "  a slight modification would return "" for values you do not require." The downside to this, however, is that this would slow down Excel.

# Re: Creating a formula to autofill a range of cells based on input

Hi, i stumbled upon this and found solution...

For example

 A B C 1 Fund 100 (user input) 2 Splitter 10 (user input) 3 4 5 formula * formula **

* =sequence(c2,1)
** =if(b5="","",if(b6="",#,##))
# =\$c\$1-sum(\$c\$3:c4)
## =\$c\$3/\$c\$4+randbetween(-5,5)/100*(\$c\$1/\$c\$2)

Legends,

YOU WILL HAVE TO COPY THE ## FORMULA MANUALLY (for ex, copy from c5 to c200)
* will create sequence based on c2 input in rows, and 1 in columns
** will identify, if the cell left to it, b5, is blank, it will be blank, but if not blank (still in the sequence), it will give formula. Formula # if b6 is blank, meaning b5 is the LAST sequence. Formula ## if b6 is not blank, meaning b5 is still in the MID of sequence
# I have to make row 3 and 4 blank to manipulate formula to count for last cell, total fund, minus the sum of all the divider before this last cell
## formula to randomize the amount of fund splitted equally, but given -5 and 5 percent (per100) deviation