What this calculator does
A trillion is 1,000 billion. That is the whole relationship: under the short scale used in Australia, the UK, the US and international finance today, each named unit above a million is 1,000 times the last, so a trillion sits exactly three orders of magnitude above a billion, the same fixed step that separates a million from a billion.
This calculator converts billion to trillion in either direction: enter a number of billions to see how many trillions that is, or enter a number of trillions to see how many billions make it up. National debts, GDP figures and the largest company valuations are routinely reported in one unit by one source and the other by another, and it is easy to be off by a factor of a thousand when converting between them in your head.
The formula
Converting billions to trillions divides by 1,000, since it takes 1,000 billion to reach one trillion. Converting trillions to billions multiplies by 1,000. Both directions use the same fixed factor.
| Term | Meaning |
|---|---|
| Billion | One thousand million: 1,000,000,000, or 10⁹, under the short-scale definition used here. |
| Trillion | One thousand billion: 1,000,000,000,000, or 10¹², under the short scale, also equal to a million million. |
| Short scale | The counting system where each new named unit is 1,000 times the last (million, billion, trillion). It is the standard in modern English-language usage. |
The inputs explained
| Field | What to enter |
|---|---|
| Value | The number of billions or trillions you are converting, depending on the direction chosen below. |
| Convert | Choose whether you are converting billions into trillions, or trillions into billions. |
When to use it
Reading a national debt or GDP figure
Government debt and GDP are often reported in trillions by one source and billions by another; converting between the two avoids misreading the scale of a figure by a factor of a thousand.
Comparing company valuations
Market capitalisations that pass the trillion-dollar mark are still often discussed alongside smaller companies quoted in billions; restating both in the same unit makes the comparison direct.
Sanity-checking a very large number
If a report states a figure in billions and it seems implausibly large or small compared with a related trillion-scale figure, converting between the two is a quick way to check whether a unit got dropped.
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How many trillions is a given number of billions?
Common billion figures and the equivalent number of trillions.
How many billions is a given number of trillions?
Common trillion figures and the equivalent number of billions.
Questions
How many billions are in a trillion?
Exactly 1,000, under the short-scale definition used in Australia, the UK, the US and international finance today. This is a fixed relationship, not an approximation.
How many billions make a trillion?
The same 1,000 billion, regardless of how the question is phrased: a trillion is defined as 1,000 times a billion under the short scale.
Is a trillion always 1,000 billion?
Under the short scale, yes, and that is now the near-universal standard in English-language usage. The older long scale, where the naming convention differs, is largely historical outside a few contexts.
What is the relationship between million, billion and trillion?
Each step is a fixed multiplication by 1,000: 1,000 million makes a billion, and 1,000 billion makes a trillion. See the million to billion converter for the step below this one.
For the equivalent step one order of magnitude down, see the million to billion converter.