Return on Investment (ROI)
Return on Investment (ROI) measures the profitability of an investment by comparing the net profit to the cost. The formula is: ROI = (Revenue - Cost) / Cost x 100, expressed as a percentage.
Understanding Return on Investment (ROI)
ROI is the universal metric for evaluating whether a business investment is worth the money. A 200% ROI means you earned $2 for every $1 invested. Simple in concept, ROI becomes complex in practice when attributing revenue to specific investments.
In e-commerce, ROI is calculated differently for different channels. For paid advertising: (Ad Revenue - Ad Spend) / Ad Spend. For a review app subscription: (Incremental Revenue from Reviews - App Cost) / App Cost.
The biggest mistake in e-commerce ROI calculation is ignoring time horizons. A Facebook ad that costs $100 and generates $50 in same-day sales looks like a -50% ROI. But if those customers have a $300 CLV over 12 months, the true ROI is 200%.
Another common mistake is measuring ROI in isolation. A review app impact is distributed across every product page and visitor. This is why Revenue Per Visitor tracking is more useful than direct ROI for conversion optimization tools.
Why It Matters for E-Commerce
ROI is the fundamental metric for deciding where to invest your limited marketing budget. Understanding true ROI — including long-term and indirect effects — prevents over-investing in channels with flashy short-term returns.
Related Terms
Return on Ad Spend (ROAS) is a marketing efficiency metric that measures the revenue generated for every dollar spent on advertising. It is calculated by dividing total revenue attributed to ads by total ad spend.
Customer lifetime value (CLV) is the total net revenue a business can expect from a single customer account throughout their entire relationship. It accounts for repeat purchases, average order value, and the duration of the customer relationship.
Customer Acquisition Cost (CAC) is the total cost of acquiring a new customer, calculated by dividing all sales and marketing expenses by the number of new customers gained during a specific period.
Revenue Per Visitor (RPV) is the average amount of revenue generated per website visitor. It is calculated by dividing total revenue by total number of visitors over a given period.
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GlossaryReturn on Ad Spend (ROAS)
Return on Ad Spend (ROAS) is a marketing efficiency metric that measures the revenue generated for every dollar spent on advertising. It is calculated by dividing total revenue attributed to ads by total ad spend.
GlossaryChurn Rate
Churn rate is the percentage of customers who stop purchasing from your store over a given period. For subscription businesses, it measures cancellations; for traditional e-commerce, it tracks customers who do not return within an expected repurchase window.
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