A ratio for 'freemium' as a whole isn't really all that informative and you shouldn't make any decision based on it. I think you can expect completely different

A ratio for 'freemium' as a whole isn't really all that informative and you shouldn't make any decision based on it. I think you can expect completely different results depending on your specific case. 30% & 0.03% are both possible in different circumstances. Also, since the definition of 'user' is pretty loose, you can't really use these numbers to make any assumptions about the cost of serving them. If a free user stops using a service, he doesn't cancel his subscription. A paid user does. Freemium users are also hard to distinguish from trial users since the two are often amalgamated.