What do you need to calculate the ROI of your marketing efforts? It’s not rocket science, but it requires similar diligence to track all of your spending by campaign.
Marketing activities can bring measurable ROI. At least for all external costs you should measure if it was worthwhile.
What can you measure when trying to grow demand? Of the many KPIs to measure, one with a big impact on the success of efforts to increase demand and eventually revenue is often overlooked: Lead Cycle Time.