Google Shopping Ads ROAS Calculator

Measure ROAS, CPA, CPC, and POAS for your Google Shopping and Performance Max campaigns. See which campaigns actually make money.

Campaign data

Performance

ROAS

4.91×

Strong

POAS (after COGS)

2.40×

CPC (avg cost per click)$0.83
CPA (cost per order)$19.44
Conversion rate4.29%
Gross profit$8401.20

How to measure Google Shopping ROAS

Pull campaign metrics from Google Ads

Google Ads > Campaigns > last 30 days. Export: cost, conversion value, clicks, conversions. Filter to just Shopping or Performance Max campaigns if you want channel-specific ROAS.

Factor in COGS

Google Ads reports revenue. It doesn't know your product cost. Calculate total COGS for the orders that came from Shopping ads. ROAS of 5× sounds great until you find out it's on a 70% COGS product.

Check Shopping vs Performance Max separately

Performance Max often outperforms standard Shopping on ROAS but cannibalizes brand search. Breaking them out reveals whether PMax is driving incremental revenue or stealing from other channels.

Google Shopping performance realities

Shopping and PMax differ from Meta and TikTok in two important ways: intent and attribution.

Shopping traffic has higher intent

Meta ads interrupt browsing; Shopping ads appear when someone is actively searching. Conversion rates are typically 2-3× higher on Shopping vs social ads. That's why Shopping ROAS benchmarks are typically higher (3-6×) than social (2-4×).

Product feed quality drives everything

Shopping performance depends on your Merchant Center feed: titles, images, descriptions, Google Product Category, GTIN. A well-optimized feed can 2-3× ROAS on the same ad spend just through better matching.

Review stars in Shopping listings

Products with 4+ stars and 50+ reviews get review extensions in Shopping ads (the gold stars below price). Shopping ads with visible stars get 5-15% higher CTR and 10-20% higher conversion than plain listings.

Performance Max: all-in but opaque

PMax combines Shopping, Display, YouTube, Gmail into one campaign with shared budget. Typical ROAS lift is 15-25% over standard Shopping. Downside: Google decides the channel mix and you can't see which channels contribute.

Branded vs non-branded matters

Branded search (people typing your store name) converts at 5-10× non-branded. A good Shopping ROAS report should exclude branded traffic to see your real acquisition performance. Otherwise, brand volume masks weak acquisition campaigns.

Add stars to your Shopping ads
lift ROAS by 10-20%

Google Shopping ads with visible star ratings outperform plain listings. WiserReview pushes verified review data to Google Merchant Center automatically, unlocking stars in your Shopping ads.

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FAQs

Common questions about Google Shopping and PMax ROAS.

Healthy Shopping ROAS for ecommerce: apparel 4-6×, beauty 3-5×, electronics 4-7×, home 3-5×. Performance Max usually runs 15-25% higher ROAS than standard Shopping. Aim for at least 3× ROAS blended.
For stores new to Google Ads, start with standard Shopping. Learn what works, then layer in PMax. PMax is more automated but needs good historical data and a solid feed to perform. Test for 30 days minimum before judging.
Connect a review source to Google Merchant Center (WiserReview, Google Customer Reviews, Trustpilot, Yotpo all support this). Minimum 50 reviews at 3.5+ stars per product. Once approved, stars appear below your listings automatically.
Common causes: feed quality degraded (images, titles, availability), auction pressure increased (seasonal), competitors lowered prices, or bids were raised past the profit point. Check feed health first (Merchant Center Diagnostics), then review bidding strategy.
For new campaigns: Manual CPC for 30-60 days to build conversion data. Then switch to Target ROAS bidding once you have 100+ conversions. Google's algorithm needs data to optimize; starting with automated bidding on a new account usually underperforms.