Someone mentioned Math::BigFloat. I recently discovered a new-ish (as of 5.8.0) pragma use bignum which transparently overloads all things numeric with the Math::BigFoo equivalent. It's worth looking into but if you're going to be doing heavy lifting I recommend setting a precision level or using one of the alternative support libraries since the native Calc can cause problems ("precision" grows, memory consumption skyrockets, and execution time slows to a crawl).