To get ROI, you need to also know the value of a customer. If each customer pays 2 x Customer Acquisition cost in the first month, then the ROI is 2 in the firs

To get ROI, you need to also know the value of a customer. If each customer pays 2 x Customer Acquisition cost in the first month, then the ROI is 2 in the first month. If it's a subscription, and 100% stay for a year, then it's 24 (or 2400%) in the first year. Pro-ROI calculations take into account the time-value of money and taxes.