Performing calculations using VBA

[gwpatton]

Hi I am relatively new to using VBA, I have been playing around with simple commands and have reached the limit of what I can do. I am looking to perform a calculation of data using VBA that will do the same thing as this formula in excel 0.5*(G31+G30)*(H31-H30)+I30 returning only the a value in column P starting in row 31. This operation will need to be applied to the entire range of data in columns G and H starting in row 31
I don’t even know where to start on this, any help would be appreciated.
Thanks

[mdmackillop]

Welcome to VBAX
Simplest way is to do the calculations on the sheet, then get rid of the formulae
[vba]
Option Explicit
Sub DoCalc()
Dim Rng As Range
Set Rng = Range(Cells(31, 7), Cells(Rows.Count, 7).End(xlUp)).Offset(, 9)
Rng.FormulaR1C1 = "=0.5*(RC[-9]+R[-1]C[-9])*(RC[-8]-R[-1]C[-8])+R[-1]C[-7]"
Rng.Value = Rng.Value
End Sub

[/vba]

[gwpatton]

Thanks that works perfectly