Million, Billion and Trillion Converter

Two meanings of “billion”

There are two systems for naming large numbers, and they agree up to a million and then diverge permanently.

The short scale multiplies by a thousand at each new name: a million is 10⁶, a billion 10⁹, a trillion 10¹². This is what “billion” means in the United States, in modern British and Irish usage, and in English-language finance and journalism everywhere.

The long scale multiplies by a million at each new name, and fills the gaps with “-ard” words: a million is 10⁶, a milliard 10⁹, a billion 10¹², a billiard 10¹⁵. This is what “billion” means in French, German, Spanish, Italian, Dutch, Polish and Portuguese.

So a German Billion is a US trillion. The two words are spelled the same, need no translation, and differ by a factor of a thousand — which is precisely why the mistake survives translation software and copy-editing. The tool above warns whenever you select a name that means something else in the other convention, and stays quiet for the names both scales agree on, because a warning on every unit is a warning on none.

Which countries use which

Short scale: the United States, the United Kingdom and Ireland (since the 1970s), Canada in English, Australia, New Zealand, Brazil, Russia, Turkey, and English-language international finance and media generally.

Long scale: France, Germany, Spain, Italy, the Netherlands, Belgium, Portugal, Poland, most of Scandinavia, and most of Spanish-speaking Latin America. In these languages a milliard, Milliarde or millardo is the word for 10⁹ — the thing an English speaker calls a billion.

Two wrinkles are worth knowing. First, Britain switched: the long-scale billion of 10¹²was standard British usage until the Treasury adopted the American meaning in 1974, so a British source from the 1960s saying “billion” probably means a million million. Second, Canada is split along language lines — English Canadian usage is short scale, French Canadian usage historically long — so a bilingual document can carry both conventions in its two halves.

How to write it so nobody has to guess

The reason technical and scientific writing rarely uses these words at all is that there are unambiguous alternatives, and they cost nothing to adopt.

SI prefixes are defined without reference to either scale: giga is 10⁹ and tera is 10¹², in every country and every language. A figure written as 4.2 GW or 1.3 TB cannot be misread. Scientific notation is equally safe: 4.2 × 10⁹ says exactly what it says.

Where the words are unavoidable — most journalism, most annual reports — the fix is to state the convention once. Financial statements conventionally do this in the header: “in thousands” or “in millions” above a column removes the ambiguity for everything below it, which is why that line exists and why deleting it to save space is a false economy.

Counting the zeros

The quickest sanity check on any large figure is the zero count, because it does not depend on knowing which convention was meant. A short-scale billion has nine zeros; a long-scale billion has twelve. A short-scale trillion has twelve; a long-scale trillion has eighteen.

Grouping helps more than counting. Written with thousands separators, a short-scale billion is 1,000,000,000 — three groups of three after the leading digit — and each additional short-scale name adds exactly one group. That is a shape the eye can read at a glance, which is why the tool shows every result grouped as well as plain.

Above 10¹⁵ a further problem appears that has nothing to do with naming: ordinary computer arithmetic stops being able to hold these numbers exactly. The limit is 9,007,199,254,740,991 — just over nine quadrillion — and past it a spreadsheet or a calculator built on standard floating point silently substitutes the nearest value it can represent. This page works in exact integers instead, so a nineteen-digit figure keeps its last digit.

Doing it in a spreadsheet

Scale conversion is one multiplication: millions to billions is =A1/1000 on the short scale, and a short-scale billion to a long-scale billion is =A1/1000 as well, because the gap is the same factor. Going from a long-scale billion to short-scale billions is =A1*1000.

For display rather than arithmetic, a custom number format keeps the underlying value intact while showing a shorter one: #,##0,,"M" displays a figure in millions with an M suffix — each comma before the closing quote divides the display by a thousand — and #,##0,,,"B" does the same in billions. The cell still holds the full number, which is what you want for any later calculation.

Watch the precision ceiling described above: a spreadsheet holds numbers as doubles, so a figure past about 9 × 10¹⁵ loses its trailing digits there too, and no amount of formatting brings them back. Keep such values as text and convert a copy.

Related calculators

Where a large figure usually goes next:

More in Conversion, or browse all calculators.

Sources and methodology

Nothing here is fetched and there is no data feed: every figure is computed from what you type. The arithmetic is a power of ten and needs no authority; the conventions do, and that is what the sources settle — when British usage changed, why technical writing prefers SI prefixes to scale names, and the exact point at which floating-point arithmetic stops being able to hold these numbers.

• Hansard, HC Deb 20 December 1974 — the Treasury adopts the American billionUK Parliament Hansard · verified 2026-09-06 · That British official usage moved from the long-scale billion (10¹²) to the short-scale billion (10⁹) in 1974, which is why older British sources cannot be read with modern assumptions
• The International System of Units (SI), 9th edition — SI prefixes as the unambiguous alternativeBureau International des Poids et Mesures · verified 2026-09-06 · That giga (10⁹) and tera (10¹²) are defined without reference to scale names, which is why technical writing prefers them
• Style guide — numbers and figures in official EU publicationsPublications Office of the European Union · verified 2026-09-06 · That EU English-language publications use the short-scale billion while several member-state languages use the long scale domestically
• Number.MAX_SAFE_INTEGER — the 2^53 − 1 ceiling on exact integersMDN Web Docs, Mozilla · verified 2026-09-06 · The 9,007,199,254,740,991 limit past which ordinary floating point silently loses integer digits — reached well below a quintillion