How Many Zeros in a Million, Billion, and Trillion? (2024)

This entry was posted on February 15, 2020 by Anne Helmenstine (updated on January 14, 2023)

Have ever wondered how many zeros are in a million, billion, or trillion? Do you know how many zeros are in a vigintillion or a googol? Knowing how to write ordinary large numbers is useful for science ormath class (or your bank account, if you are rich). Use your knowledge of the gigantic numbers to impress your friends.

Numbers Based on Groups of Three Zeros

While ten and a hundred get their own name, larger numbers are based on groups of three zeros. This table gives the name for the groups of zeros in a number.

NameNumber of ZerosGroups of (3) Zeros
Thousand31 (1,000)
Ten thousand4(10,000)
Hundred thousand5(100,000)
Million62 (1,000,000)
Billion93 (1,000,000,000)
Trillion124 (1,000,000,000,000)

What the Numbers Look Like Written Out

A table can be useful to look up how many zeros large numbers have. But, if you need to know how to write them, it helps to see them written out in all their glory.

Ten: 10 (1 zero)
Hundred: 100 (2 zeros)
Thousand: 1000 (3 zeros)
Ten thousand 10,000 (4 zeros)
Hundred thousand 100,000 (5 zeros)
Million 1,000,000 (6 zeros)
Billion 1,000,000,000 (9 zeros)
Trillion 1,000,000,000,000 (12 zeros)
Quadrillion 1,000,000,000,000,000 (15 zeros)
Quintillion 1,000,000,000,000,000,000 (18 zeros)
Sextillion 1,000,000,000,000,000,000,000 (21 zeros)
Septillion 1,000,000,000,000,000,000,000,000 (24 zeros)
Octillion 1,000,000,000,000,000,000,000,000,000 (27 zeros)
Nonillion 1,000,000,000,000,000,000,000,000,000,000 (30 zeros)
Decillion 1,000,000,000,000,000,000,000,000,000,000,000 (33 zeros)

Zeros Grouped in Sets of 3

The larger a numeral gets, the harder it becomes to count the digits. So, digits in large numbers are grouped in sets of three. Write numbers with commas separating sets of three zeros so that it’s easier to read and understand the value. For example, write one million as 1,000,000 rather than 1000000. The set of three starts as you move to the left of a decimal point (the last zero). So, you write 10,000 rather than 100,00. Commas aren’t commonly used after the decimal point, unless you’re dealing with a value containing a large number of digits, like pi. Sometimes a space is used instead of a comma to separate digits.

As another example, it’s much easier to remember that a trillion is written with four sets of three zeros than it is to count out 12 separate zeroes. While you might think that that one is pretty simple, just wait until you have to count 27 zeros for an octillion or 303 zeros for a centillion. It is simpler to remember nine and 101 sets of zeros, respectively.

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How Many Zeros in a Million, Billion, and Trillion? (2)

Power of 10 Prefixes

Review the power of 10 prefixes and make naming large numbers easier.

Numbers With Very Large Numbers of Zeros

The numbergoogol(termed byMilton Sirotta) has 100 zeros after it. Here’s what a googol looks like, written out with all of its zeros:


You may notice the number googol bears a resemblance to the company name Google. This isn’t by accident. Google is a mis-spelling of googol and fits the company’s goal of being an extremely large search engine.

Do you think the googol is big? How about thegoogolplex, which is a one followed by a googol of zeros. The googolplex is so large its value exceeds the number of atoms in the known universe.

Yet, a googolplex isn’t the largest number described to date. Graham’s number is so enormous it can’t even be described using everyday mathematics. When Graham’s number was described in 1977, it was the largest positive integer used in a mathematical proof. Since then, even larger numbers have been described, such as TREE(3).

Short Scale and Long Scale

The names given to large numbers based on powers of ten vary between different countries. The two main naming systems are the short scale and the long scale. The United States uses the short scale, in which a billion is 1,000 million and is written as a one followed by nine zeros.

The long scale is used in France and was previously used in the United Kingdom. In the long scale, a billion means one million million. According to this definition of a billion, the number is written with a one followed by 12 zeros. Both the short scale and long scale were described by French mathematician Genevieve Guitel in 1975.


Related Posts

How Many Zeros in a Million, Billion, and Trillion? (2024)


How Many Zeros in a Million, Billion, and Trillion? ›

A million has six zeros (1,000,000), a billion has nine zeros (1,000,000,000), and a trillion has twelve zeros (1,000,000,000,000). These numbers are incredibly large and difficult for our brains to fully grasp.

How many zeros are in million, billion, and trillion? ›

How Many Zeros in a Million? How Many Zeros in a Billion? Reference Chart
NameNumber of ZerosWritten Out
One Million61,000,000
8 more rows

How many millions is a billion and a trillion? ›

1 million is equal to 1,000 thousands (106). 1 billion is equal to 1,000 millions (109) or 0.001 trillion. 1 trillion is equal to 1,000 billions (1012) or 1,000,000 millions.

How many zeros are in 1 trillion? ›

A trillion is a 1 with 12 zeros after it, represented as 1,000,000,000,000 or 10¹².

What is this number 1000000000000000? ›

As discussed in our blog, a quadrillion can be defined as 1 with 15 zeros. It can written as 1,000,000,000,000,000.

What number has 1000 zeros? ›

And a googol is 1 followed by 100 zeros. So 1 followed by 1000 zeros is many many many googols (a googol times a googol … times a googol—a googol to the power ten), but that is simply miniscule compared to a googolplex.

Is gazillion a real number? ›

Answer and Explanation:

'Gazillion' is not a real number. Actually, it's not a number at all! 'Gazillion' is a word that is used to describe a large amount of something, such as 'There were a gazillion ants on the ice-cream cone I dropped.

Are there any trillionaires? ›

Oxfam also found that the five richest men globally have more than doubled their vast wealth since 2020. If current trends continue, the world will have its first trillionaire within a decade, but poverty won't be eradicated for another 229 years.

Is zillion a real number? ›

'Zillion' is not a real number. It's not actually the name of a number at all. People may say they have a 'zillion' things, but they are using this as a made-up adjective that means 'a huge amount. ' In mathematics, there is no number called a 'zillion.

Is Google a number yes or no? ›

Google is the word that is more common to us now, and so it is sometimes mistakenly used as a noun to refer to the number 10100. That number is a googol, so named by Milton Sirotta, the nephew of the American mathematician Edward Kasner, who was working with large numbers like 10100.

Is 1 googol a number? ›

A googol is 10 to the 100th power, which is 1 followed by 100 zeros. While this is an unimaginably large number, there's still an infinite quantity of larger numbers. One such number is googolplex, which is 10 to the power of a googol, or 1 followed by a googol of zeros.

What is 100000000000000000000000000 in words? ›

What is 100000000000000000000000000 in words? 100,000,000,000,000,000,000,000,000 equals 100 septillion.

How many zeros are in a gazillion? ›

A guy named greg actually provides a definition for a gazillion. He claims that "gaz" is actually latin for earthly edge. Assuming this to mean the earths circumference in greek miles, which he claims to be 28,810, he defines a gazillion as 1 followed by 28,810 sets of zeroes.

Is 1 trillion a 13 digit number? ›

There are 13 digits in 1 trillion (1 followed by a total of 12 zeros). The Indian system uses 10 Kharab as the numerical representation of 1 trillion. 1000 Arabs equals 10 Kharab in the Indian numbering system, and 10 Kharab equals one trillion.

What comes after centillion? ›

Scientific Notation: Table of Large Numbers
10 more rows

What is million billion and trillion called? ›

Names for large numbers
Scientific notationAmerican name (Short Form)Old European name (Long Form)
100,000Hundred thousandHundred thousand
47 more rows

What is bigger 1 trillion or 1 billion? ›

One trillion (1,000,000,000,000) is the equivalent of 1000 billion or 1 million millions.


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