How this calculator works
On the short scale, a billion is one thousand million. Dividing a million value by 1,000 gives billions, and multiplying a billion value by 1,000 gives millions. The full number readout shows the digit string behind the names.
Formula
billions = millions / 1,000. millions = billions x 1,000. 1 million = 10^6. 1 billion = 10^9.
Worked example
2,500 million = 2.5 billion = 2,500,000,000. 7 billion = 7,000 million. 0.25 billion = 250 million.
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Frequently asked questions
How many millions are in a billion?
One thousand on the short scale used in Canada and the United States. A billion is 1,000,000,000, which is 1,000 x 1,000,000.
Is a billion always a thousand million?
In modern English, usually yes. Some other languages and older British usage use the long scale, where a billion is a million million. Check the convention when a document could be using the long scale.
How many zeros are in a billion?
A billion has nine zeros: 1,000,000,000. A million has six and a trillion has twelve.