What is the marketing efficiency ratio?
The marketing efficiency ratio, or MER, is total revenue divided by total marketing spend. It is a top-down read on whether all of your marketing, taken together, is paying off.
It sidesteps the weakness of channel ROAS. Where ROAS depends on attribution and can double-count overlapping channels, MER ignores attribution entirely and looks at the whole picture.
The formula.
MER = total revenue ÷ total marketing spend. Use every marketing dollar and all revenue over the same period, not a single channel.
The result is a multiple. A MER of 4x means the business earned four dollars of revenue for every dollar spent on marketing across the board.
A worked example.
The business earns 400,000 in revenue and spends 100,000 on marketing in the quarter. MER is 400,000 ÷ 100,000, which is 4x.
What is a good MER?
Many businesses aim for 3 to 4x or higher, but the right level depends on margin and model. Because MER is blended, it is harder to game than ROAS, though it cannot tell you which channel is working. A low MER means either marketing is inefficient or a large share of revenue is not marketing-driven, and only channel data can say which.
MER is the blended ceiling; channel ROAS is the detail underneath. The pair shows where efficiency comes from, and where turning awareness into action is breaking down.
How to improve it.
Cut the spend that is not moving total revenue, and reallocate toward what is. Since MER counts organic revenue too, anything that grows revenue without growing spend lifts the ratio directly.
Organic search is exactly that kind of lever, since it grows revenue while lowering your blended acquisition cost.