How does a 305 cc snow blower compare to a 10 hp snow blower?

I've researched the same thing, last year actually when buying a 305 cc snow blower with a Briggs engine... I've heard it's comparable to 10 horse but there's no scientific way to convert CC's to horsepower. I can tell you that living in a snow belt in Ontario, the 305 CC's holds up just fine.