Free tool
The ROAS that only gets you back to zero.
Break-even ROAS is contribution-aware. Using revenue ÷ ad spend against gross sales will tell you that unprofitable ads are working.
Break-even ROAS3.42×
Contribution per $1 sales29.16 of each dollar
Formula
break_even_roas = ad_spend / contribution_per_dollar_of_sales, equivalently sale / contribution
Example
If $120 of sales leaves $35 contribution, break-even ROAS is 120 / 35 = 3.43. Anything below that loses money.