In the short scale used in English today, a trillion is a thousand billion (10¹²). Government budgets and company valuations often move between the two.
How to use the Billion to Trillion Converter
- Type the number of billion into the Billion field. Decimals such as 500 are fine.
- Read the answer in Trillion – it updates as you type, with no button to press.
- To convert the other way, type into Trillion and the billion are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only billion ⇄ trillion. Need a different unit? Use the general number converter, where you can choose any “from” and “to” unit.
How it works
Both units measure number, so they are always in the same ratio: one billion equals 0.001 trillion. The calculator multiplies the number of billion you type by 0.001 to give trillion, and when you type into the trillion field it divides by the same factor to give billion. Because the ratio never changes, doubling the billion always doubles the trillion. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
How to convert billion to trillion
- Write down the value in billion, for example 1,000 billion.
- Multiply by the conversion factor 0.001 (because 1 billion = 0.001 trillion).
- 1,000 × 0.001 = 1 trillion.
- To go back from trillion to billion, divide by 0.001 – or multiply by 1,000.
billion to trillion conversion table
| Billion | Trillion | Trillion | Billion |
|---|---|---|---|
| 1 billion | 0.001 trillion | 1 trillion | 1,000 billion |
| 10 billion | 0.01 trillion | 2 trillion | 2,000 billion |
| 100 billion | 0.1 trillion | 5 trillion | 5,000 billion |
| 500 billion | 0.5 trillion | 10 trillion | 10,000 billion |
| 1,000 billion | 1 trillion | 20 trillion | 20,000 billion |
| 2,500 billion | 2.5 trillion | 50 trillion | 50,000 billion |
| 10,000 billion | 10 trillion | 100 trillion | 100,000 billion |
| 1,000 trillion | 1,000,000 billion |
What is a billion?
A billion is 10⁹ (1,000,000,000) in the short scale used in English today, equal to 100 crore.
What is a trillion?
A trillion is 10¹² in the short scale, a thousand billion.
Common mistakes to avoid
Misreading south asian digit grouping (1,00,00,000) as international grouping, and the old british “long scale” billion (10¹²), no longer in use.
Formula
1 billion = 0.001 trillion1 trillion = 1,000 billiontrillion = billion × 0.001Worked example
Inputs — Billion: 1,000 billion.
Results — Trillion = 1 trillion.
Frequently asked questions
How many billions in a trillion?
1,000.
What is 2,500 billion?
2.5 trillion.
How many trillion are in one billion?
1 billion = 0.001 trillion.
How many billion are in one trillion?
1 trillion = 1,000 billion.
How do I convert billion to trillion?
Multiply the number of billion by 0.001. For example, 1,000 billion × 0.001 = 1 trillion.
How do I convert trillion back to billion?
Divide by 0.001 (or multiply by 1,000), or simply type the value into the trillion field above.
What is 10 billion in trillion?
10 billion = 0.01 trillion.
What is 100 billion in trillion?
100 billion = 0.1 trillion.
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between billion and trillion. To pick any number unit, use the general number converter linked under Related calculators.
What formula does the Billion to Trillion Converter use?
1 billion = 0.001 trillion.