How Many Zeros in a Jillion?
How many zeros in a jillion? A jillion has no fixed number of zeros — it is an informal, undefined term used in casual speech to mean "an extremely large, uncounted quantity." Like zillion, gazillion, and bazillion, jillion follows the pattern of real "-illion" numbers to suggest enormous scale without committing to any actual value. The word originated around 1940 in American English. Learn more about zeros in a bazillion.
A jillion has
—
zeros
- Written Form
- No specific value
- Scientific
- N/A
Is a Jillion a Real Number?
No — a jillion is not a real number. Real named large numbers have precise, mathematically agreed definitions: a million is exactly 106, a trillion exactly 1012, a googol exactly 10100. Jillion has none of these properties.
| Term | Real? | Zeros |
|---|---|---|
| Million | Yes | 6 |
| Decillion | Yes | 33 |
| Googol | Yes | 100 |
| Jillion | No | Undefined |
How Does Jillion Compare to Zillion, Gazillion, and Bazillion?
All four are informal non-numbers with undefined values. In everyday use, speakers sometimes arrange them in an informal size order based purely on how large they feel, but there is no mathematical basis for this ranking. Learn more about zeros in a googol.
A vigintillion is exactly 1063; a jillion is whatever the speaker means when they can't be bothered to name a specific amount.
Where Did the Word "Jillion" Come From?
- Emerged in American English in the 1940s
- The "j-" prefix was chosen for its playful sound, like "z-" in zillion or "g-" in gazillion
- Owes its feel of largeness entirely to the borrowed "-illion" suffix
Zeros in a Jillion: FAQ
Is a jillion a real number?
Quick answer
No — it has no exponent, no scientific notation, and no place in any mathematical standard. Learn more about how many zeros does a googolplex have.
When did "jillion" first appear?
Quick answer
Around 1940, in American English.
Is a jillion bigger than a zillion?
There's no formal answer — both are undefined; any ranking is purely a matter of how emphatic the word feels.
What real number should I use instead of "jillion"?
If you need precision, use a formally defined number — million through centillion, or googol for something truly enormous.
Does "jillion" appear in any dictionary?
Yes, as an informal noun meaning "an extremely large but unspecified number" — without a numerical definition.