How to measure effectiveness of marketing campaign?

ROI (Return on investment) and CPA (Cost per acquisition) can ideally measure a marketing campaign's effectiveness. However, there are other merits as well that are equally perfect for the task, such as:

1. Cost per Lead (CPL):

This metric is beneficial in B2B organization business sale cycles. It measures the effectiveness using the amount you spent on each gained lead.

2. Click-through rate (CTR):

This metric collects data about the people who clicked your marketing email or advert. Therefore, it gives you an idea about the interest of your target audience in the offer.