You can convert some prefixes (nano, micro, milli, and none) to other prefixes by using this App.
You can also convert per second, pre minute, pre hour, pre day, and pre year.

Usage examples :
・Sievert(Sv) or Gray(Gy) for radiation.
・Metre(m) for length.
・Gram(g) for mass.
,etc.

This App is useful for the nuclear crisis in Japan (Fukushima, Tohoku, and Tokyo, etc.).

*Reference :
・Environmental radiation levels in Tokyo / day
・Sievert - Wikipedia
・SI prefix - Wikipedia
・E notation - Wikipedia

* for iOS :
"nano,micro,milli convert for iPhone, iPod touch, and iPad"
( search "yorodzu.com" on AppStore )