Facebook Ads Break-Even Calculator

The arithmetic

Break-even on paid social is the same as anywhere: break-even ROAS is 1 ÷ contribution margin, and break-even cost per acquisition is the contribution per order.

The complication specific to this channel is that reported ROAS overstates real ROAS, so a campaign hitting break-even in the platform is losing money in the bank.

The honest break-even therefore has to be set above the arithmetic one by whatever the attribution gap is.

The same thing with real figures

At a 55% contribution margin the arithmetic break-even ROAS is 1.82.

If the platform typically reports 30% higher than blended reality, the reported figure needed to reach real break-even is 1.82 × 1.3 = 2.37.

So a campaign reporting 2.1, comfortably above the arithmetic break-even; is actually below it.

Measuring the attribution gap once and adjusting the target accordingly is the difference between an account that appears profitable and one that is.

The catch

The attribution gap is not constant. It varies by campaign type, by how much brand demand exists, and by how much of the audience was going to buy anyway. Retargeting typically has a much larger gap than cold prospecting.

Applying one adjustment across all campaign types therefore over-corrects the ones doing genuine acquisition and under-corrects the ones harvesting existing demand.

Applying it

Measure blended ROAS monthly and compare it against the weighted platform figure. The ratio between them is the adjustment factor, and it is worth recalculating quarterly.

Then set campaign targets in adjusted terms so the numbers being managed against correspond to money rather than to attribution.

The three break-evens worth knowing

There is a campaign break-even, at which the advertising covers its own cost of goods. A business break-even, which also covers fixed costs. And a growth break-even, which also funds the working capital that the next month's inventory requires.

They can be far apart. A campaign at 2.0 ROAS clears the first, may not clear the second, and almost certainly does not clear the third for a business growing quickly.

Accounts managed to the first number look profitable and run out of cash; accounts managed to the third grow more slowly and survive. Knowing which one the target represents is a more consequential decision than any bid or budget change, and it is one most advertisers have never explicitly made.

Break-even should be checked against the contribution after returns rather than before, since paid social drives impulse purchases with elevated return rates in several categories.

A campaign break-even calculated on pre-return contribution can be several points too generous, which is enough to make a marginal campaign look viable when it is not.

Tracking return rate by campaign rather than in aggregate identifies which creative is attracting buyers who keep the product and which is attracting buyers who do not.

Return rates on paid social also tend to be worst on the creative that performs best on click-through, which is a pattern worth checking before scaling a winner.

Attribution windows change this number more than most people expect. A seven day click and one day view window credits Meta with conversions that a one day click window would not, and the reported cost per acquisition moves accordingly without any change in what actually happened. Comparing a break-even figure calculated under one window against results reported under another is comparing two different measurements.