How to Improve Your ROAS on Google Shopping in 2026

Google Shopping is one of the most effective customer acquisition channels for ecommerce — when it’s working. When it’s not, it burns budget on irrelevant traffic and margins shrink with every click. Improving your ROAS (Return on Ad Spend) on Google Shopping is about systematic optimisation across feed, structure, bidding, and audience strategy.

What’s a Good ROAS on Google Shopping?

Target ROAS depends on your margins. First, calculate your break-even ROAS:

Break-Even ROAS = 1 ÷ Gross Margin %

If your gross margin is 50%, your break-even ROAS is 2 (200%). If you want a 20% profit on ad spend, you need a ROAS of 2.5 (250%). Benchmark ROAS by category:

• Fashion/apparel: 3–6x
• Home décor and furniture: 3–8x
• Electronics: 2–4x (lower margins)
• Beauty and health: 4–8x
• Food and beverage: 3–6x

Fix 1: Improve Your Product Feed Quality

The product feed is the foundation of Google Shopping. Poor feed quality results in disapproved products, ineligible auctions, and poor ad serving. The most impactful feed improvements:

• Optimise product titles: Google uses your product title as a key matching signal. Include brand, key attributes (colour, material, size), and the most important keyword. “Premium Stainless Steel Insulated Water Bottle 1L — Black” beats “Water Bottle — Black”.
• Add GTINs (barcodes): Products with valid GTIN codes get preferential placement in Google Shopping auctions. If your products have barcodes, add them. If you manufacture your own, use a GS1 prefix.
• Use accurate, specific product types: “Apparel & Accessories > Clothing > Tops & Tees > T-Shirts” tells Google’s algorithm exactly what you’re selling — more specific = better auction matching.
• Populate all optional fields: Material, colour, size, pattern, gender — these enable product filter matching and improve targeting precision.
• Fix all Merchant Centre warnings: Disapproved products don’t serve. Check the Diagnostics tab in Merchant Centre weekly and fix issues proactively.

Fix 2: Use Negative Keywords Aggressively

Negative keywords prevent your Shopping ads from showing for irrelevant searches. In Shopping campaigns, you can’t see the keywords you’re bidding on — but you can see the actual search terms in the Search Terms report.

Review your Search Terms report weekly for the first 60 days, then monthly. Common negatives to add immediately:

• “free”, “DIY”, “how to make”, “instructions”, “template”
• “used”, “second hand”, “refurbished” (unless you sell these)
• “wholesale”, “bulk”, “trade” (unless you’re B2B)
• Competitor brand names (unless running a competitor campaign)
• Irrelevant product attributes (“plastic” if you only sell metal, for example)

Fix 3: Segment Products by Performance

Not all products perform equally. Running all products in one campaign with one budget means your weak performers drain budget from your strong performers.

After 30 days of data, segment by performance:

• Campaign 1: Best sellers — your top 10–20 products by revenue. Higher budget, higher Target ROAS.
• Campaign 2: Mid performers — products with some conversions but not top tier. Standard budget.
• Campaign 3: Everything else / discovery — lower bid, low budget. Occasionally a low-performer becomes a winner — this campaign surfaces them.

Fix 4: Choose the Right Bidding Strategy

• Target ROAS: Best when you have 50+ monthly conversions. Google’s machine learning optimises bids to hit your ROAS target. Start at a conservative target (200–300%) and increase gradually as performance stabilises.
• Maximise Conversion Value: Use this before you have enough data for Target ROAS — it focuses on getting the highest-value conversions regardless of ROAS. Transition to Target ROAS once you hit 50+ monthly purchases.
• Manual CPC: Full control, but requires daily monitoring. Rarely outperforms smart bidding once you have sufficient data.

Fix 5: Layer Audience Signals

In Performance Max and standard Shopping campaigns, adding audience signals tells Google’s algorithm which users are most valuable. Add these as observation audiences (not targeting — this keeps full reach while biasing toward high-value users):

• Customer match: upload your email list — Google finds similar users
• Website visitors (all): people who have visited your store in last 30 days
• Cart abandoners: your highest-intent audience
• Competitor website visitors: available in some markets via affinity audience categories

Fix 6: Improve Your Landing Pages

Google’s Quality Score for Shopping includes landing page experience. A fast, relevant product page improves your Quality Score, lowers your effective CPC, and improves your position — even at the same bid as competitors with worse pages.

• Product page must load in under 3 seconds on mobile
• Price shown on the ad must match the price on the landing page
• Product must be in stock — out-of-stock products in Shopping ads get a poor Quality Score and eventual disapproval
• Product images in the ad should match images on the landing page

OneOnic manages Google Shopping campaigns for Shopify brands — from feed optimisation and campaign structure through to ongoing ROAS improvement. If you want expert hands on your Google Shopping, get in touch.