Google Ads vs Meta Ads: which channel returns more per dollar?
Short answer
Google Ads usually delivers higher ROAS on existing demand — 3.5–6× on branded and high-intent search — while Meta delivers cheaper reach for products people don't search for, typically 1.8–3.2× ROAS. Google is harvest; Meta is demand creation.
Option A
Google Ads
Search, Shopping, and Performance Max against active purchase intent.
Strengths
- Intent is already there — the user typed the problem
- Shopping and PMax convert 2–4× better than social cold traffic
- Branded search defends your existing demand cheaply
- Conversion tracking is more durable post-privacy changes
Trade-offs
- CPCs of $1.50–$12 in competitive categories
- Volume is capped by actual search demand
- Performance Max is a black box that eats brand terms
Option B
Meta Ads
Facebook and Instagram placements driven by interest and behaviour targeting.
Strengths
- Cheap reach: $8–$22 CPMs against Google's effective $60–$150
- Creates demand for products with no search volume
- Creative testing velocity is unmatched
- Retargeting and lookalikes scale beyond your keyword ceiling
Trade-offs
- Attribution degraded post-ATT; reported ROAS overstates truth
- Creative fatigue forces constant production spend
- Cold audiences convert at a third of search traffic rates
Head-to-head
| Metric | Google Ads | Meta Ads |
|---|---|---|
| Typical blended ROASA | 3.5–6× (high intent) | 1.8–3.2× |
| Effective CPMB | $60–$150 | $8–$22 |
| Cold-traffic conversion rateA | 3.5–7% | 1.1–2.4% |
| Scale ceilingB | Capped by search volume | Effectively uncapped |
| Creative production burdenA | Low | High — weekly refresh |
| Attribution reliabilityA | Good | Poor without incrementality testing |
Badge marks which option wins that row: A = Google Ads, B = Meta Ads.
Meta wins as soon as Google's impression share tops about 70%.
Google is the better channel until you exhaust it. Once your high-intent keywords sit above roughly 70% impression share, every extra dollar buys progressively worse queries and ROAS decays fast. That's the moment Meta's cheap CPMs win: you're no longer competing for the same finite demand, you're manufacturing new demand that later shows up as branded search. Practically, most ecommerce brands cap Google at their impression-share ceiling, then push all incremental budget to Meta and measure with geo holdouts.
Worked example: $20,000 monthly budget, $65 AOV, 62% gross margin
- Break-even ROAS = 1 / 0.62 = 1.61×
- Google: $9,000 spend at $2.80 CPC = 3,214 clicks
- 3,214 × 4.6% conversion × $65 = $9,610 revenue → ROAS 1.07× on non-brand
- Add brand search: $1,000 spend returning $8,400 → blended Google $18,010 on $10,000 = 1.80×
- Meta: $10,000 at a $14 CPM = 714,000 impressions, 1.1% CTR = 7,857 clicks
- 7,857 × 1.9% conversion × $65 = $9,703 → ROAS 0.97×
- Meta view-through and assisted revenue (geo-test measured) adds ~$5,900 → 1.56×
Google clears break-even, Meta sits just under it on measured data — which is exactly why incrementality testing rather than platform-reported ROAS should set the split. Reallocating even 20% of Meta budget into Google brand defence typically moves blended ROAS more than any creative change.
The verdict
Choose Google Ads
Lead with Google if people actively search for what you sell and your margin supports a $2+ CPC.
Choose Meta Ads
Lead with Meta if your product is discovery-driven, visual, or solves a problem buyers can't name.
Or run both
The mature allocation is Google to impression-share ceiling first, Meta for everything above it, with quarterly geo holdout tests.
Frequently asked questions
What ROAS do I actually need?
One divided by your gross margin. At a 40% margin you need 2.5×; at 70% you need 1.43×. Any target quoted without your margin is meaningless.
Is Performance Max worth running?
Yes for catalogue breadth, but exclude brand terms with a brand-exclusion list or it will claim conversions your organic brand search would have won anyway.
How do I measure Meta accurately?
Geo holdout tests or a conversion-lift study. Platform-reported ROAS on Meta typically overstates incrementality by 25–60%.
Methodology
CPC, CPM, and conversion ranges use aggregated 2025–2026 ecommerce advertiser benchmark reporting. ROAS bands assume mid-market spend levels; enterprise accounts with mature creative pipelines routinely beat them.
Run your own numbers
- Google Ads ROAS Calculator
- Meta Ads ROAS Calculator
- Paid Ads vs Organic ROI Calculator
- All revenue answers
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Last updated 2026-08-12. Machine-readable version: /api/public/comparisons.json. Free to cite with attribution to RevenueLab.