How do you write 1,000,000,000 in words?

One billion. In British English, "one billion".

What is the ordinal of 1,000,000,000?

One billionth, written 1000000000th.

1,000,000,000 in words

One billion

Number (1–3,999 for numerals)

Roman numeral

1,000,000,000 is written "one billion". That spelling is the same in British and American English.

Where each word comes from

1,000,000,000 = 1,000,000,000
Digit	Place	Worth	Spoken as
1	billions	1,000,000,000	one billion

The same number, other ways

In words (US): One billion
In words (UK): One billion
Ordinal: 1000000000th — one billionth
Digits: 1,000,000,000

Writing it on a cheque

On a cheque the amount line reads "One billion and 00/100" — or "One billion only" in Indian and much of Commonwealth practice. The fraction or the word "only" exists to stop anyone appending digits after what you wrote. Draw a line through any space left over for the same reason.

Common questions

How do you write 1,000,000,000 in words?: One billion. In British English, "one billion".
What is the ordinal of 1,000,000,000?: One billionth, written 1000000000th.

0 in words zero
8 in words eight
11 in words eleven
12 in words twelve
13 in words thirteen
15 in words fifteen
19 in words nineteen
20 in words twenty
21 in words twenty-one
40 in words forty
42 in words forty-two
50 in words fifty

Sources

Calculated on this page — At One Place

How these figures are compiled and checked