What is MER?
MER — Marketing Efficiency Ratio — is total revenue divided by total marketing spend. An MER of 3.0 means every dollar of marketing produced three dollars of revenue. Unlike ROAS, which measures one channel's media spend, MER counts everything — which is why it is the number that decides whether an influencer deal actually paid for itself.
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The formula — and the influencer-deal version
MER = total revenue ÷ total marketing spend
For a single creator collaboration, measured before you sign:
Deal MER = net forecast revenue ÷ (creator fee + product cost + shipping)
Every cost the deal creates is counted, on the side where it belongs. The denominator is the full cost of the deal — creator fee, cost of goods and shipping for the forecast orders — not just the fee. And the revenue is net: if the creator shares a discount code, order value is counted after that discount comes off. A $500 fee with $300 of gifted product and fulfilment is an $800 deal, selling at 15% off. Miss either side and a “profitable” collab quietly stops being profitable.
What counts as a good MER?
It depends which MER you are looking at. A blended, store-wide MER (all revenue ÷ all ad spend) is usually judged against 3–5 for a healthy DTC store, because the denominator excludes the cost of goods. A per-deal MER on full cost — the definition above — has a much sharper scale:
The useful discipline is not chasing a magic number — it is knowing the deal's break-even fee before negotiating: the fee at which MER hits exactly 1.0. Every dollar below it is profit; every dollar above is a loss you signed up for knowingly. Our ROI forecasting guide walks through the four inputs that produce it.
MER vs ROAS vs POAS — when to use which
They answer different questions. ROAS (revenue ÷ media spend) is the right lens before a fee exists — comparing creators on what their audience is worth. MER is the right lens once a real fee is on the table — the full-cost verdict on the deal as negotiated. And if you want profit per dollar rather than revenue per dollar, that metric exists too: POAS (profit on ad spend = gross profit ÷ spend). MER is deliberately revenue-based — the profit view is POAS's job, and a good forecast reports both. In practice: shortlist on forecast ROAS, sign on forecast MER, and compare forecast to actual after the post goes live. The forecast itself starts from real reach — median views, not follower count — because reach is the input every downstream number inherits.
Common questions
What is MER in marketing?
MER — Marketing Efficiency Ratio — is total revenue divided by total marketing spend. Where ROAS usually measures revenue against the spend on one channel or ad, MER measures efficiency against everything you spent. An MER of 3.0 means every $1 of total marketing spend produced $3 of revenue.
What is a good MER for an influencer collaboration?
For a single creator deal measured on full cost — net revenue (after any creator discount code) divided by creator fee plus product and shipping for forecast orders — 1.0 is break-even and anything below loses money. A practical target for DTC stores is around 1.2, and demanding much above 2.0 usually means leaving good deals unsigned. Blended store-wide MER benchmarks are higher (often 3–5) because they divide by ad spend only, not the full cost of goods.
What is the difference between MER, ROAS and POAS?
ROAS = revenue ÷ media spend for one campaign or channel. MER = revenue ÷ total marketing spend — the blended, everything-counted version. POAS = gross profit ÷ spend — the profit-based cousin, for when revenue alone would flatter a low-margin campaign. All three are ratios on spend; they differ in whether the numerator is revenue or profit and how much of the spend the denominator counts.
Is MER based on revenue or profit?
Revenue. MER is total revenue divided by total marketing spend — that is the standard definition across the industry. If you want profit per dollar of spend, use POAS (profit on ad spend = gross profit ÷ spend). They are complementary: MER tells you how hard your marketing dollars work at the top line; POAS tells you what is left after product costs.
How do I calculate MER for a creator deal before signing it?
Forecast the revenue first: estimate the creator’s real reach (median views of recent posts), apply your store’s conversion rate and average order value net of any creator discount code, then divide that forecast revenue by the total deal cost — creator fee, product cost of forecast orders, and shipping. If the ratio is below 1.0, the deal loses money even if the creator performs exactly as expected.
Get a creator's MER before you negotiate
The free ROI calculator forecasts revenue, break-even fee and ROAS for any creator from their real reach and your store's numbers — the same engine that powers Acurrate's product forecasts.