How much is a billion? And why a Spanish billón is a trillion
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A billion is a thousand million (9 zeros); the Spanish billón is a million million (12 zeros), our trillion. The two scales in one table, where the mess comes from (Chuquet, 1484) and how to translate without slipping a factor of a thousand.
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A billion is a thousand million: 1,000,000,000, a 1 followed by nine zeros. That is what the word means in English everywhere today. But cross into Spanish, French, German or Portuguese and the same-looking word (billón, billion, Billion, bilião) means a million million, 1,000,000,000,000: a thousand times more. Their "billion" is our trillion. The two words look so alike that translations, headlines and official reports get it wrong every day, and every mistake is off by a factor of a thousand. The tool above shows one billion dollars in working time; switch it to a trillion to see the gap.
The two scales, in one table
English uses the short scale: every new name is a thousand times the previous one (a billion is a thousand million, a trillion a thousand billion). Spanish and most of continental Europe use the long scale: every new name is a million times the previous one (a billón is a million million, a trillón a million billones). From nine zeros up, the same words mean different numbers.
| Number | In English (short scale) | In Spanish (long scale) |
|---|---|---|
| 1,000,000 (10⁶) | one million | un millón |
| 1,000,000,000 (10⁹) | one billion | mil millones (or un millardo) |
| 1,000,000,000,000 (10¹²) | one trillion | un billón |
| 10¹⁵ | one quadrillion | mil billones |
| 10¹⁸ | one quintillion | un trillón |
The practical rule: Spanish billón = English trillion, English billion = mil millones, and a Spanish trillón is a quintillion. If a Spanish or French source says "un billón de dólares", it almost certainly means a trillion.
How big a billion and a trillion really are
The words do not help, so count instead. In seconds: a million seconds is 11.6 days; a billion seconds is 31.7 years, nearly a whole working life; a trillion seconds is 31,700 years, roughly the time since humans painted the caves of Lascaux and Altamira. The gap between an English billion and a Spanish billón is the gap between a career and the whole history of art.
In money, with the figures of the money tool: one billion dollars is 358 whole working lives on the US average wage ($69,770 a year for 40 years); one trillion dollars is 358,000 working lives, or 32 days of wages for every worker in the United States. A billion is what a country earns in a few hours; a trillion takes it a month.
The big numbers in the news are mostly trillions: US GDP was $30.76 trillion in 2025 (BEA) and the federal debt passed $40 trillion in August 2026, reaching $40.3 trillion in October (Treasury). A Spanish newspaper writes those as 30,76 billones and 40,3 billones de dólares. The other way round: Spain's GDP in 2025 was €1,690,012 million, which Spanish sources call 1,69 billones de euros and English ones €1.69 trillion; its public debt, 1,76 billones in June 2026, is €1.76 trillion. Not 1.76 billion: a thousand times that.
Where the mess comes from: a mathematician in Lyon, 1484
The words were coined by Nicolas Chuquet, a French physician and mathematician who wrote the Triparty en la science des nombres in 1484 and needed names for huge numbers. He grouped digits in sixes and invented the series byllion, tryllion, quadrillion, quyllion…: a byllion was a million million, a tryllion a million byllion. His manuscript went unpublished in his lifetime; the names first appeared in print in 1520 in a book by Estienne de la Roche, and in 1549 Jacques Peletier du Mans popularised milliard for a thousand million. That is the long scale, the one Spanish still uses.
The short scale was born in France too, in the seventeenth century, when some arithmeticians began grouping digits in threes and giving each group a new name: billion became a thousand million. The United States inherited that habit from the French in the nineteenth century, and France then turned around completely: the General Conference on Weights and Measures recommended the long scale in 1948 and the French government made it official by decree on 3 May 1961. Britain held on to the long scale (a British billion was a million million for two centuries) until 20 December 1974, when Prime Minister Harold Wilson answered in writing in the House of Commons that the government would use billion only to mean a thousand million, because "it is now used internationally to mean 1,000 million and it would be confusing if British Ministers were to use it in any other sense". Since then English is short scale everywhere.
Who uses which scale
- Short scale (billion = 10⁹): the United States, the United Kingdom since 1974, Ireland, English-speaking Canada, Australia, New Zealand, and Brazil, where Portuguese uses bilhão for a thousand million even though Portugal's bilião is a million million.
- Long scale (billón = 10¹²): Spain and most of Latin America, France, Germany, Italy, Portugal, the Netherlands, the Nordic countries and continental Europe in general.
- Grey zone: Spanish as spoken in the United States and Puerto Rico. Through contact with English, billón is often used there to mean a thousand million; the Spanish academies' usage dictionary accepts it only in that context and advises against it everywhere else.
Millardo: the word Spanish invented to fix this
In 1995 the Royal Spanish Academy admitted millardo, adapted from the French milliard, precisely so that nobody would translate billion as billón: a millardo is a thousand million, unambiguously. The word exists, it is correct, and almost nobody uses it; in practice mil millones ("a thousand million") remains the natural phrase, as the academies themselves acknowledge. Their language watchdog, FundéuRAE, repeats the warning every few months: the English billion is not the Spanish billón.
Three tips for reading or writing across the two languages: if the source is Spanish, French or German, every billón is a trillion; be wary of the abbreviations "B" and "bn", which mean 10⁹ in English and nothing fixed in Spanish; and when the figure matters, write it out in full or in millions. "1,690,000 million" has one reading; "1.69 billion" depends on who is talking.
Frequently asked questions
- How much is a billion?
- In English, a billion is a thousand million: 1,000,000,000, a 1 followed by nine zeros (10⁹). In Spanish and most of continental Europe the look-alike word billón means a million million (10¹²): our trillion.
- How many zeros are in a billion?
- Nine in English (1,000,000,000). A Spanish billón has twelve, the same as an English trillion.
- What is a billion in Spanish?
- Mil millones ("a thousand million"), or un millardo. Never billón, which is a thousand times bigger. And trillion translates as billón.
- Did Britain ever use the long scale?
- Yes. A British billion was a million million until 1974, when Harold Wilson's government adopted the thousand-million meaning already used in the United States and internationally.
- How much is a trillion?
- A thousand billion: 10¹², a 1 with twelve zeros. In Spanish that number is called un billón; the Spanish trillón is 10¹⁸, our quintillion.
Want a feel for other amounts? See one million dollars, 100 million, one billion or one trillion dollars in working time with the money tool. And for areas, water and weights there is the Hectareometer, the liters tool and the kilos tool.