What is a conversion rate?

The rate for which something is converted. For example. If you were to give me 1 pie for 8 apples, then the conversion rate would be 8:1. Then, if I had 24 apples, I would know how many pies I could get with those apples.

Or, in the case of websites, it's the rate by which a desired action is performed. For commercial websites, a conversion is usually a sale, so the conversion rate is the % of visits which result in a sale. For a noncommercial website, it can be something like how many times a free whitepaper or infographic is downloaded, or how often people sign up for a newsletter or subscribe to a blog or even comment or share.

Either way, the formula is really simple. It's just the number of times the desired outcome happens, divided by the total number of unique visits.

For conversion rates of various currencies, here's a website here that shows them: www.xe.com

Also the rate of Sane people converted to Church of Jesus Christ Scientists.

Conversion rate or ROI determines the success of your marketing campaign. Create goals and funnels, most analytics tools like gostats and GA alllows that. measure the traffic and conversion rate and try to increase it.