Use the ROAS formula and worked example to set a break-even target, assess campaign efficiency, and make better budget decisions.
ROAS stands for return on ad spend. It measures the revenue attributed to advertising relative to the amount spent on that advertising. A ROAS of 4.0 means you generated four euros in revenue for every euro of ad spend. It measures campaign efficiency, not final profit.
Divide the revenue attributed to an ad, campaign, or channel by its advertising cost. The formula is ROAS = advertising revenue ÷ ad spend. Multiply the result by 100 if you want a percentage. A ratio of 4.0 is the same as 400%.
You need two figures for the same period and campaign scope: attributed advertising revenue and total ad spend. Include the full media cost and use a consistent attribution method. Mixing channel revenue, time periods, or campaign costs produces a misleading result.
Suppose a campaign costs €2,000 and generates €8,000 in attributed revenue. Divide €8,000 by €2,000 to get a ROAS of 4.0, or 400%. Each euro of advertising produced four euros in revenue, but that does not mean four euros in profit.
There is no reliable universal benchmark. A good ROAS must exceed your break-even point and support your profit target. The required level depends on product margin, shipping, payment fees, discounts, returns, and other variable costs. Compare campaigns against your own economics rather than a generic industry number.
Divide 1 by your contribution margin before advertising, expressed as a decimal. If that margin is 25%, the break-even ROAS is 1 ÷ 0.25 = 4.0. At that level, advertising uses the available contribution margin. A lower result loses money, while a higher result leaves room for profit and fixed costs.
Improve targeting and creatives, move budget toward campaigns that exceed break-even, raise landing-page conversion rates, and increase order value where appropriate. Check attribution, UTM parameters, conversion tracking, and return data before changing spend. Smart Funnels can show where visitors drop out, while Heatmaps and Session Replays help identify landing-page friction.