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In most English speaking countries today, one billion equals 1,000,000,000, or 109[?], or one thousand millions. This is also the convention adopted by Wikipedia.

In most other countries, one billion equals 1,000,000,000,000, or 1012[?], or one million millions. The above mentioned billion is called one milliard in these countries.

Origin late 17th century: From French, prefix bi- (twice) and -illion (from million). In imitation of one million million. Trillion: one million million million and so on.

Britain and Australia traditionally employed the international usage of 1012, but have recently largely switched to the U.S. version of 109.


1484 the french mathematician Nicolas Chuquet[?] wrote in his article "Triparty en la science de nombres":
Au lieu de dire mille milliers, on dira million, au lieu de dire mille millions, on dira byllion, etc..., et tryllion, quadrilion...octylion, nonyllion, et ainsi des autres si plus oultre on voulait procéder (translation: Instead of saying thousand thousands, one will say million, instead of saying thousand million, one will say billion, etc..., and trillion, quadrillion, ..., octillion[?], nonillion[?], and similar as far as you want to proceed)

Around 1550 it seems that a Mr Pelletier introduced a second system, the term "milliard". This new system was used in England and Germany and part of the rest of Europe, but USA and France itself did not change to the new word.

Then it became really complicated:

  • 1948 the "Conférence des Poids et des Mesures" proposes to use the Pelletier system in France.
  • 1961 the "Journal Officiel" (the French official gazette) decided in favor of this proposal.
  • Some dictionaries recommend: "The terms billion, trillion, quintillion, quatrillion, quintillion and sextillion are to be avoided because of the ambiguity"
  • In 1974 British prime minister Harold Wilson abandoned the use of billion for 10^12, by explaining before the House of Commons the fact that "billion" from now on in British government statistics has the American use i.e. means 10^9.

But there seems still to be uncertainity about this:

On one side, Graham Dane, a native english speaker, writes in the forum of the Online-vocabolary LEO.org:

The term milliard is very rare in British English. Billion has meant thousand million in financial writings for many years now, and is almost universal in other fields. Anyone using billion to mean million million is likely to be misunderstood.

On the other side, in the FAQs of alt.usage.english (the part by Ken Moore) states:

Despite this, the U.S. meaning is still rare outside journalism and finance, its introduction having served merely to create confusion. Throughout the U.K., a common response to the question "What do you understand by 'a billion'?" would be: "Well, I mean a million million, but I often don't know what other people mean." Few schoolchildren are confident of the meaning, though, again, 10^12 seems to be preferred.

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