Marketing Efficiency Ratio (MER)
Marketing efficiency ratio (MER) measures how much revenue a business generates for every unit of marketing spend across all channels. It provides a blended view of marketing performance without attributing revenue to any specific channel.
Why it matters
Unlike channel-specific metrics such as ROAS, MER looks at marketing performance as a whole. It is calculated by dividing total revenue by total marketing spend over a specific period. This makes it useful when revenue attribution across channels is fragmented or difficult to measure consistently.
MER works well as a high-level health check for marketing performance. It can help leadership understand whether overall marketing efficiency is improving or declining. However, it does not show which channels are driving the results, so it is less useful for deciding where to increase or reduce spend. Teams typically use MER alongside channel-level metrics rather than as a replacement for them.
Calculating MER consistently requires bringing total marketing spend and revenue into one view for each reporting period. Consolidated reporting tools can bring data from connected advertising accounts and other revenue sources together, reducing the need to compile figures from separate reports each month.
Example
Imagine a company spends $10,000 on marketing in a month and generates $50,000 in revenue during the same period. To calculate the Marketing Efficiency Ratio, divide the total revenue by the marketing costs:
- MER = Total Revenue / Marketing Costs
- MER = $50,000 / $10,000
- MER = 5
This means that for every dollar spent on marketing, the company earns $5, indicating efficient marketing efforts.