From: ferne on 5 Jun 2010 00:04 I have a spreadsheet which across the top has the months Jan to Dec and Total. Under each month is 4 categories Days/oil/gas and would like to simplify a formula for a weighted avg. eg. A B C D E F G H I JANUARY FEBRUARY MARCH etc. to December days Oil gas days Oil Gas days Oil Gas 6 22 13 4 5 18 7 12 15 formula: =(a1*b1+d1*e1+g1*h1)/(a1+e1+g1) Is there any way to simplity this. Thanks for any help anyone can give. ferne

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