An unoptimized conversion rate of content marketing for SAAS is about 0.5%. That is, just by getting in front of people, some portion of them will take action.
At the other end, a highly targeted piece of content, could convert as high as 10-20%. That is content that is very tailored.
For most content marketing, the conversion rate is going to fall between 1.5% <> 3%, balancing some scale and reasonable drop off rates. If you are performing in these bands, you are doing ok.
This is part of our Guide to Content Marketing for SAAS.