A little help for a newbie?

I am trying to start injecting some pinyin into my emails where it's relevant and applicable.  It would be very handy to be able to sanity check myself before sending it but I can't seem to find anything that does a pinyin -> english translation.  Does anyone know of one?

Here's the sentence I have come up with:

wǒ shì jiāng zài Shànghǎi qī tiān.

Thanks for any help!