NEW YORK (Bloomberg) ? Hurricanes Katrina, Rita and Wilma may cost insurers including State Farm Mutual Automobile Insurance Co. $57.6 billion, more than double the annual record for US natural disasters, a consulting firm said.

Katrina may cost $40.4 billion, before taxes; Rita, $6.4 billion; and Wilma, $10.8 billion, according to New York-based Advisen Ltd. The figure includes Advisen?s projection that State Farm and other privately owned insurers have yet to report roughly $5 billion in claims.

The estimate falls between the $52 billion to $79 billion forecast by storm damage modeller Risk Management Services Inc. and the $45.2 billion estimated by Property Claim Services Inc. Risk Management uses computer models to gauge losses and Property Claim surveys insurers as claims come in.

Advisen?s forecast includes losses reported by 120 insurers and may increase by billions of dollars if lawsuits are successful in forcing insurers to cover flood damage from Katrina, the firm said.

Estimated losses for State Farm, the largest US home and auto insurer, exceed $1 billion, said David Bradford, an executive vice president at Advisen.

He declined to be more specific, and State Farm, which hasn?t released any loss estimates, had no immediate comment, said spokesman Dick Luedke.

The 2005 Atlantic Ocean hurricane season, with 26 named storms, was the worst since record-keeping began more than 150 years ago. Katrina, which struck the US Gulf Coast on August 29, brought the most destruction, wiping out towns along coastline from Louisiana to Alabama and triggering floods that submerged as much as 80 percent of New Orleans.