400 watt Fortron...UPS size needed for this?

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I am wanting to place an order for a UPS for my computer. I want one that Belkin has (located HERE (http://catalog.belkin.com/IWCatSectionView.process?IWAction=Load&Merchant_Id=&Section_Id=76)). When I look at them they have a specification that says "Battery load capacity" followed by a wattage #. Now, what size UPS capacity should I get for my computer powered by my 400 watt fortron? Will one w/ 400 watts be enough, or do I need more...or could I get by with less?? Thanks peeps!

Edit: a bit more research and i found some answers...so...nevermind!