If you're talking about public conversions, very few, I would guess. Most preachers I have heard speak on the subject like to say that if you witness to people

If you're talking about public conversions, very few, I would guess. Most preachers I have heard speak on the subject like to say that if you witness to people and the number of conversions you see in your lifetime is > 0, then you can call it a success, and if the number of conversions = 0, then you can at least be confident that it had some impact according to a verse in Isaiah 55:11 that says "So shall my word be that goeth forth out of my mouth: it shall not return unto me void, but it shall accomplish that which I please, and it shall prosper in the thing whereto I sent it." Given that, from the street preacher's perspective, his success-rate is 100%. As far as actual conversions, also called a Profession of Faith, I would guess that the quality of the pitch has a lot to do with the final results. Here's an example of a good pitch (American street preaching in Peru, with subtitles): http://www.youtube.com/watch?v=OjYLUpHQaiE http://www.youtube.com/watch?v=OjYLUpHQaiE