Extension to Ruby's Numeric for easy conversion between hash rate units (adapted from https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/numeric/bytes.rb).

hash_ext.rb

##
# Example:
#
#     123.kilohashes + 1.hash * 1.megahash
#     => 1123000
#
class Numeric
  KILOHASH = 1000
  MEGAHASH = KILOHASH * 1000
  GIGAHASH = MEGAHASH * 1000
  TERAHASH = GIGAHASH * 1000
  PETAHASH = TERAHASH * 1000
  EXAHASH  = PETAHASH * 1000

  def hashes
    self
  end
  alias hash hashes

  def kilohashes
    self * KILOHASH
  end
  alias kilohash kilohashes

  def megahashes
    self * MEGAHASH
  end
  alias megahash megahashes

  def gigahashes
    self * GIGAHASH
  end
  alias gigahash gigahashes

  def terahashes
    self * TERAHASH
  end
  alias terahash terahashes

  def petahashes
    self * PETAHASH
  end
  alias petahash petahashes

  def exahashes
    self * EXAHASH
  end
  alias exahash exahashes
end

Scratch that. Overriding Object#hash is a really bad idea.