Return on ad spend (ROAS)

Before you rely on it

What to check

Compare it against your contribution margin, not against 1.0.

The common error

Where people go wrong with return on ad spend (ROAS)

Scaling spend on a 2.0 ROAS with a 30% margin. Every additional pound of advertising is losing money, and the revenue chart looks excellent while it happens.

Worked through

Return on ad spend (ROAS) in plain numbers

A business spends $5,000 on ads and attributes $20,000 of revenue to them. ROAS is $20,000 ÷ $5,000, or 4.0, sometimes written 400%. That sounds good, but revenue is not profit. If the products earn a 30% gross margin, gross profit is $6,000, and after the $5,000 in ad spend the campaign nets $1,000; the break-even ROAS is 1 ÷ 0.30, or 3.33. Below that, each ad dollar loses money even though revenue arrives; a ROAS of 4 could be excellent for a business with a 50% margin and mediocre for one with a 25% margin. The right target comes from margin.

Easily confused

Return on ad spend (ROAS) and its neighbours

ROAS is not ROI and not CPA. ROI compares profit to cost, so it accounts for the cost of the goods. ROAS compares revenue to ad spend and ignores everything else. Cost per acquisition states what it costs to win one customer. Return on ad spend can be measured on a campaign, channel or business level. Lifetime value changes the story for products with repeat purchases: a ROAS below break-even on the first order may pay off later. Attribution rules decide which revenue counts.

In real decisions

Where return on ad spend (ROAS) turns up

Marketers watch ROAS to compare campaigns and decide where to shift budget. Agencies report it to clients. E-commerce teams set target ROAS for bidding tools; comparing it with margin and lifetime value avoids optimizing for revenue that loses money; it helps spot underperforming ads quickly. Reviewing by product line shows where advertising is efficient.

Know the edges

Where return on ad spend (ROAS) stops being reliable

ROAS depends on attribution, and platforms tend to claim credit generously. Ads may influence sales that happen later or through other channels. Sales that would have occurred anyway inflate it; it ignores fixed costs and the cost of managing campaigns, and use incrementality tests where possible, and treat platform-reported numbers with caution.

Quick answers

What people ask about return on ad spend (ROAS)

What is a good ROAS? It depends on your margins. Divide one by your gross margin to find break-even ROAS. Any figure above break-even earns a profit before other costs.

Should I use platform-reported ROAS? Treat it with care. Platforms may credit sales that would have happened anyway. Compare with your own revenue data and use tests where possible.

How is ROAS different from ROI? ROAS divides revenue by ad spend. ROI divides profit by cost, so it accounts for what the goods cost.

Can ROAS be below 1? Yes. It means you earned less revenue than you spent on ads. Low ROAS can still be worthwhile if the customers come back and spend more later.