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How to use Excel Sum Function in VBA

Sum Function using VBA Excel

What would be the first thing that you will do if you want to check how to code Sum function in VBA?

Record a Macro, of course and boom,  code in VBA is ready and done.

Recording a Sum macro in Excel, will have a code like this one below:

                   ActiveCell.FormulaR1C1 = “=SUM(RC[-9]:RC[-2])”

Now the question is how to interpret this formula?

What if the range change or the requirements need a different cells location?

Record again a new VBA? I don’t think it’s a good idea.

The formula that Excel uses when you record isn't that hard to interpret.

You just need to get the hang of it.

Let's interpret the above excel formula.

                   ActiveCell.FormulaR1C1 = “=SUM(RC[-9]:RC[-2])”

If you will just do a basic formula function, you can just type:

                   =SUM(Start_Range:End_Range)

The R1C1 formula follows same idea.

So, =SUM(RC[-9] is the start range and the RC[-2] is the end range.

RC[-9] means 9 columns before the active cell.

RC[-2] means 2 columns before the active cell and is also last cell in the range.

The formula uses "active cell", which basically function what it name says.

If the active cell is "J7", so above formula will add the values on A7, B7, C7, D7, E7 and H7 as the last cell.

What happened to I7? I7 will not be calculated.

Why it will not be calculated because of the "RC[-2]"? Which means the last cell is 2 columns before the active cell.

So if you want I7 to be included you can change to "RC[-1]".

You can change the VBA formula to: Cells(7, 10).Value = "=SUM(RC[-9]:RC[-2])"

Cells(7,10) - means row 7 and column 10 which is basically equals to J7 also.


Or you can just specify the VBA formula as: Range("J7").Value = "=SUM(RC[-9]:RC[-2])"

                          ActiveCell.FormulaR1C1 = “=SUM(RC[-9]:RC[-2])”

The above formula is good if you require repetitive tasks.

Like if you have a template that requires every 7 columns to be added and leave one space blank.

And place the result right after the blank cell.

Like if you have a template that requires A7 to H7 to be summed up, A14 to H14 to be summed up also and later on the template also requires A21 to H21 to be summed up as well.

You can tweak or change the formula depends on your requirements.

Above formula sum up values that are in columns.

What if you need to summed up values in rows?

Recording Macro in Excel to sum up rows will have this formula.

                            ActiveCell.FormulaR1C1 = "=SUM(R[-5]C:R[-1]C)"

Still same idea applies that is used in summing up columns or to this basic sum formula:

                            =SUM(Start_Range:End_Range)

So, R[-5]C means 5 rows above the active cell is the start range.

And R[-1]C  means 1 row above the active cell is the last cell.

If the active cell, is M6 it will add the values of M1, M2, M3, M4 and M5.

So if you want to add row from M1 to M3, you can change the last range to R[-3]C.

Which basically will sum up rows M1 to M3 only and M4 and M5 will not be included. 
Because R[-3]C, which means the last range or last cell is 3 rows above from the active cell.

Changing  formula to  ActiveCell.FormulaR1C1 = "=SUM(R[-5]C:R[-3]C)" and the active cell is M6.

Above formula can also be interpreted as =SUM(M1:M3), and the equivalent of  this in VBA code formula can be written as: Range("M6").Value = "=SUM(M1:M3)".



Happy Coding!! Cheers!!


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