How Many Billions Does It Take To Make A Trillion

Large numbers are numbers above one million that are usually represented either with the use of an exponent such as 10⁹ or by terms such as billion or thousand millions that frequently differ from system to system. The American system of numeration for denominations above one million was modeled on a French system, but in 1948 the French system was changed to correspond to the German and British systems. In the American system each of the denominations above 1,000 millions (the American billion) is 1,000 times the preceding one (one trillion = 1,000 billions; one quadrillion = 1,000 trillions). In the British system each of the denominations is 1,000,000 times the preceding one (one trillion = 1,000,000 billions) with the sole exception of milliard, which is sometimes used for 1,000 millions. In recent years British usage has reflected widespread and increasing use of the American system.

The table provides American and British names for various large numbers.

Large numbers
value in powers of ten	number of zeros	American name	British name
10⁹	9	billion	thousand million or milliard
10¹²	12	trillion	billion
10¹⁵	15	quadrillion	thousand billion
10¹⁸	18	quintillion	trillion
10²¹	21	sextillion	thousand trillion
10²⁴	24	septillion	quadrillion
10²⁷	27	octillion	thousand quadrillion
10³⁰	30	nonillion	quintillion
10³³	33	decillion	thousand quintillion
10³⁶	36	undecillion	sextillion
10³⁹	39	duodecillion	thousand sextillion
10⁴²	42	tredecillion	septillion
10⁴⁵	45	quattuordecillion	thousand septillion
10⁸⁴	84		quattuordecillion
10¹⁰⁰	100	googol	googol
10³⁰³	303	centillion
10⁶⁰⁰	600		centillion
10^googol	googol	googolplex	googolplex

This article was most recently revised and updated by Erik Gregersen.

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