Converts between billions and trillions under the short-scale numbering system used in the US and modern international usage.
How it works
Dividing billion by 1,000 gives trillion; multiplying trillion by 1,000 gives billion back.
What this does not include
This does not include the million-to-billion conversion — for that magnitude pair, use this site’s dedicated million to billion calculator instead.
How to use this calculator
- Enter a value in either billion or trillion — the other field fills in automatically.
Frequently asked questions
Why is a trillion 1,000 billion?
Under the short scale (used in the US and most modern contexts), each step up is a factor of 1,000: a thousand million is a billion, and a thousand billion is a trillion.
Where is this conversion commonly needed?
Comparing national GDP figures, government budgets, or large corporate valuations, which are often reported in different magnitude units.
Is the long-scale definition different?
Yes — some countries historically used a long scale where a billion meant a million million, but the short scale is now standard in nearly all modern usage.
