Numbers

Big numbers

This is a cheat-sheet to help convert between western divisions by thousands and Japanese divisions by myriads.

Number scientific English
10,000 一万 1E+4 ten thousand
100,000 十万 1E+5 one hundred thousand
1,000,000 百万 1E+6 one million
10,000,000 千万 1E+7 ten million
100,000,000 一億 1E+8 one hundred million
1,000,000,000 十億 1E+9 one billion
10,000,000,000 百億 1E+10 ten billion
100,000,000,000 千億 1E+11 one hundred billion
1,000,000,000,000 一兆 1E+12 one trillion
10,000,000,000,000 十兆 1E+13 ten trillion
100,000,000,000,000 百兆 1E+14 one hundred trillion
1,000,000,000,000,000 千兆 1E+15 one quadrillion
10,000,000,000,000,000 一京(ケイ) 1E+16 ten quadrillion

Formal numbers
The formal numbers that you will often see in koseki and on checks and
the like are as follows. These are known as 大字 DaiJi.

Formal Standard
廿 二十

Thanks to Jim Lockhart for posting this