How many millions make a billion?

One thousand millions make one billion. In the commonly used international number system, 1 billion is equal to 1,000 million or 1,000,000,000 (10⁹).

A million represents 1,000,000 (10⁶), while a billion represents 1,000 times a million. Therefore:

1 billion = 1,000 × 1 million = 1,000 million

For example, if a population is described as 1 billion people, it means there are one thousand groups of one million people. Understanding the relationship between millions and billions helps students compare large numbers, read population data, understand financial figures, and work with place values in mathematics.