1 Billion is written as 1,000,000,000. One billion is also referred to as one thousand million or milliard, yard, long scale. The cardinal number equal to 109. People use different notations to refer to a number or currency commercially. To represent a very large number the common practice that everyone follows is using millions, billions and trillions. This page gives you with two online number or currency converters that helps you with the conversions of billion to million and billion to trillion. Click on the respective links to convert between billion to million to trillion.