What is 1 billion x 1 billion equal?

1 billion x 1 billion is equal to 1 trillion. To calculate this, you multiply the two numbers together, which results in 1,000,000,000,000. This is because when you multiply a number with 9 zeros (1 billion) by another number with 9 zeros (1 billion), you end up with a total of 12 zeros in the product, which is 1 trillion.