A trillion is a thousand billion
Each step up the ladder — million, billion, trillion — multiplies by 1,000 and adds three zeros. A billion is 109 (9 zeros); a trillion is 1012 (12 zeros). So to turn billions into trillions you just divide by a thousand: 850 billion is 0.85 trillion.
Quick reference
| Billions | Trillions | Scientific |
|---|---|---|
| 1 billion | 0.001 | 1 × 109 |
| 100 billion | 0.1 | 1 × 1011 |
| 500 billion | 0.5 | 5 × 1011 |
| 1,000 billion | 1 | 1 × 1012 |
| 5,000 billion | 5 | 5 × 1012 |
| 33,800 billion | 33.8 | 3.38 × 1013 |
For scale: US GDP runs around 27–28 trillion dollars, and a single big tech company can be worth 3 trillion — that is 3,000 billion.
The one thing to watch
- Short scale vs long scale. Modern usage (US, UK, international) is short scale: billion = 109, trillion = 1012. A few old European sources used long scale, where "billion" meant 1012. Check the source date if the numbers look 1,000× off.
- Milliard. In some European languages "milliard" is the word for 109 (our billion), and their "billion" is our trillion. This calculator uses the short-scale English meaning.
- The jump is huge. Going from billion to trillion multiplies by 1,000, not by a little. One billion seconds is about 32 years; one trillion seconds is about 32,000 years.
Common questions
How many billions are in a trillion?
Exactly 1,000. A trillion is a thousand billion, the same way a billion is a thousand million. So 500 billion is 0.5 trillion, and 2,300 billion is 2.3 trillion.
How do I convert billions to trillions?
Divide by 1,000. To go the other way, from trillions to billions, multiply by 1,000. It is just moving the decimal point three places.
Is a billion the same everywhere?
In modern usage, yes: a billion is a thousand million (10 to the 9th). Some older European texts used the "long scale" where a billion meant a million million, but finance, science and the news all use the short scale now.
