ROAS (Return on Ad Spend)

What is ROAS?

ROAS (Return on Ad Spend) is a paid-media efficiency metric. It shows how much revenue a campaign generates relative to what it cost. Unlike ROI, which considers margin and operating costs, ROAS looks at gross revenue.

It is the preferred metric in e-commerce because it allows quick decisions: a campaign with ROAS below target burns budget; one above scales.

How to calculate

ROAS = Revenue generated by ads / Ad spend

It can be expressed as a number (4) or multiplier (4x). Some platforms show it as a percentage (400%).

What ROAS is good?

It depends on margin. Compute the break-even ROAS:

Minimum ROAS = 1 / gross profit margin

• 25% margin → minimum ROAS of 4
• 40% margin → minimum ROAS of 2.5
• 60% margin (digital product) → minimum ROAS of 1.67

Anything below that is direct loss.

Practical example

Cosmetics e-commerce with 35% gross margin (break-even ROAS ≈ 2.86):

• Reels campaign — cold audience: R$ 8,000 spent, R$ 22,400 in sales → ROAS 2.8 (at the limit)
• Remarketing campaign: R$ 4,000 spent, R$ 38,000 in sales → ROAS 9.5 (excellent)
• Carousel campaign — broad audience: R$ 6,000 spent, R$ 15,600 in sales → ROAS 2.6 (loss)

Decision: turn off the carousel, scale remarketing by 50% and optimize Reels campaign creatives.

How to increase ROAS

• Improve landing-page conversion (speed, copy, social proof)
• Raise average order value (upsell, kits, free shipping above X)
• Work the full funnel: cheap top (CPM/Reels), expensive retargeting (because it converts)
• Use lookalike audiences based on recent buyers
• Invest in a well-configured Pixel and Conversions API

Common mistakes

• Looking at ROAS in isolation, ignoring margin. ROAS 3 at 20% margin is a loss.
• Chasing ultra-high ROAS by killing top of funnel. Without the top, retargeting dies in 2 weeks.
• Comparing ROAS across funnel stages (cold and warm play different games).
• Trusting platform ROAS 100%. Compare with real revenue from checkout via UTMs or GA4.