AD SPEND & ROAS

MER Calculator

Calculate marketing efficiency ratio from net revenue and total marketing spend, then compare it with the break-even MER implied by contribution margin.

Currency: USD only. Net revenue excludes tax and includes shipping after discounts and refunds; spend covers all marketing categories.

Revenue and marketing spend

Net revenueProducts + shipping − discounts − refunds, excluding tax.Paid media spendMeta, Google, TikTok and other paid media.Brand spendBrand campaigns and brand media.Content & affiliate spendCreators, affiliates, content and PR.Tools & agency spendMarketing software and agency retainers.Contribution margin (%)Before marketing, after COGS, fees and fulfillment.

Planning model. Revenue and spend use the same period and currency. Revenue excludes tax and includes shipping after discounts and refunds. Marketing spend includes paid, brand, content/affiliate and tools/agency. MER is not causal and does not replace channel ROAS.

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Marketing efficiency ratio

MER

5.00xProfitable. Net revenue ÷ total marketing spend.

Total marketing spend$20,000.00All four marketing categories.

Marketing cost ratio20.0%Spend ÷ net revenue.

Break-even MER2.50xMER that leaves zero profit after marketing.

Profit after marketing$20,000.00Contribution before marketing − spend.

Contribution before marketing$40,000.00Net revenue × contribution margin.

StatusProfitableWhether marketing spend is covered.

Marketing spend scenarios

How MER and profit change if total marketing spend moves by ±20%, with revenue and margin unchanged.

Marketing spend	MER	Profit after marketing
$16,000.00	6.25x	$24,000.00
$20,000.00	5.00x	$20,000.00
$24,000.00	4.17x	$16,000.00

How MER is calculated

MER = net revenue ÷ total marketing spend. Marketing cost ratio = spend ÷ net revenue. Contribution before marketing = net revenue × contribution margin. Profit after marketing = contribution − spend. Break-even MER = 1 ÷ contribution margin; headroom = MER ÷ break-even MER − 1.

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MER: the one ratio that includes all marketing

ROAS usually measures one platform. MER compares all net revenue with all marketing spend. That makes it a business-level efficiency check, and a useful counterweight to channel dashboards.

MER versus ROAS

MER = net revenue ÷ total marketing spend. It uses all revenue, including organic and returning demand, and all marketing spend, including brand, content, affiliates and tools.

ROAS usually uses attributed revenue ÷ ad spend for one channel. A channel ROAS of 4x can coexist with a MER of 2x if organic demand is soft or brand and tool costs are large. Both are useful; they answer different questions.

Define revenue and spend before comparing

This calculator defines net revenue as products plus shipping minus discounts and refunds, excluding tax. If you include tax, MER rises without any improvement in marketing efficiency. If you exclude shipping, it falls.

Spend includes paid media, brand, content/affiliate and tools/agency. Leaving out brand or agency spend flatters MER. Pick one definition and keep it consistent across months.

Break-even MER comes from contribution margin

Break-even MER = 1 ÷ contribution margin. At a 40% contribution margin, break-even MER is 2.5x. Above that, marketing spend leaves profit; below it, the business is subsidizing growth.

Headroom = MER ÷ break-even MER − 1. A 5.0x MER against a 2.5x break-even has 100% headroom. The ratio makes different margin structures comparable.

Worked example

Net revenue $100,000. Paid media $14,000, brand $3,000, content/affiliate $2,000, tools/agency $1,000 = $20,000. MER is 5.0x and the marketing cost ratio is 20%.

At a 40% contribution margin, contribution before marketing is $40,000 and profit after marketing is $20,000. Break-even MER is 2.5x, so headroom is 100%.

Spend scenarios

At $16,000 spend, MER is 6.25x and profit after marketing is $24,000. At $20,000, MER is 5.0x and profit is $20,000. At $24,000, MER is 4.17x and profit is $16,000.

The scenario holds revenue constant, which is rarely true in practice. It is a sensitivity check, not a forecast of what extra spend will produce.

Where MER stops

MER does not prove incrementality, attribute revenue to a channel or separate acquisition from retention. It can hide a losing channel inside a strong blended number.

Use MER to check whether the total marketing engine is profitable, then use channel ROAS, CAC and LTV to decide where the next dollar goes. Do not use MER to set a platform bid.

MER references checked October 2026: Triple Whale MER · Shopify marketing metrics · TrueProfit tools

What is a good MER?+

There is no universal number. It depends on contribution margin: break-even MER is 1 ÷ contribution margin. A 40% margin needs at least 2.5x; a 25% margin needs 4x.

Is MER the same as blended ROAS?+

They are related but not identical. MER typically uses all revenue and all marketing spend. Blended ROAS often uses attributed revenue and paid media spend. Define both before comparing them.

Should brand spend be included in MER?+

Yes, if the goal is total marketing efficiency. Excluding brand spend produces a flattering ratio that ignores part of the budget. Show both only if you label them clearly.

Does MER include organic revenue?+

Yes, this calculator uses total net revenue, including organic and returning demand. That is why MER can look better than channel ROAS when organic demand is strong.

Can MER replace channel ROAS?+

No. MER is a business-level check. Channel ROAS, CAC and LTV are needed to allocate budget and diagnose specific campaigns.

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