sumifs formula required - i need a formula to calculates the sum of column F if the word

=SUMIF(D:D,"OWN",F:F) will do that.

Hi from County Down... except that I'm in Asia right now!!

unless, if you mean that the word own is present IN COMBINATION with other words, in which case use this array formula:

=SUM(IF(ISNUMBER(SEARCH("own",D1:D10)),F1:F10))

adjust ranges as needed.

Array Formulae are a little different from ordinary formulae in that they MUST be confirmed by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER.

You will know the array is active when you see curly brackets { } - or "curly braces" for those of you in the USA, or "flower brackets" for those of you in India - appear around the outside of your formula. If you do not use CTRL+SHIFT+ENTER you will (almost always) get an error message or an incorrect answer. Press F2 on that cell and try again.

Don't type the curly brackets yourself - it won't work...