Return on Ad Spend (ROAS) is the single most important metric for Google Ads performance — it tells you how much revenue you generate for every dollar (or pound, or rupee) you spend. A low ROAS isn’t always a sign you need a bigger budget. More often, it signals a structural problem with your campaigns.
This guide walks through the most impactful steps to improve ROAS across Search, Shopping, and Performance Max campaigns.
Step 1: Verify Your Conversion Tracking Is Accurate
Before optimizing anything else, confirm you’re measuring the right actions correctly. Bad conversion data is the root cause of more wasted ad spend than any other single factor.
Common conversion tracking problems:
- Counting page views as conversions instead of actual purchases or lead form submissions
- Double-counting conversions (the same sale fires the conversion tag twice)
- Including cross-device conversions that inflate numbers without reflecting real revenue
- Tracking micro-conversions (video views, scroll depth) as primary conversion actions
How to audit:
- Go to Tools → Conversions in Google Ads
- Check the “Category” column — only “Purchase” and “Lead” should be primary conversions
- Compare conversion data with your CRM or checkout system for the same date range
- Use Google Tag Manager’s Preview mode to confirm tags fire exactly once per purchase
A client we worked with was showing a 4.2x ROAS in Google Ads — but their actual revenue from ads was far lower. The issue: the “thank you” page was loading twice on some devices, double-firing the purchase conversion tag.
Step 2: Audit Your Keyword Match Types
Broad match keywords in Google Ads now trigger for a remarkably wide range of queries — including many that are irrelevant to your business. This inflates impressions and clicks without proportional revenue.
ROAS by match type (typical patterns):
| Match Type | Control | Typical ROAS |
|---|---|---|
| Exact | High | High |
| Phrase | Medium | Medium–High |
| Broad (without Smart Bidding) | Low | Low–Medium |
| Broad + Smart Bidding + strong conversion data | Low | Can be High |
Fix: Pull your Search Terms report (Keywords → Search Terms). Add irrelevant terms as negative keywords. For lower-performing broad match keywords, test switching to phrase or exact match and compare ROAS over a 30-day period.
Step 3: Separate Brand and Non-Brand Campaigns
Brand keywords (searches that include your company name) convert at dramatically higher rates than non-brand keywords. If you run them together, non-brand keywords drag down the blended ROAS, making your account look worse than it is — and causing Smart Bidding to under-invest in high-performing non-brand terms.
The fix:
- Create a dedicated “Brand” campaign with exact match keywords for your brand name and variants
- Add your brand keywords as negatives in all non-brand campaigns
- Report on brand and non-brand ROAS separately
- Set separate ROAS targets for each
Step 4: Improve Your Landing Page Conversion Rate
Ad spend doesn’t convert — landing pages do. A 1% landing page conversion rate requires 3x more ad spend to achieve the same result as a 3% conversion rate.
Highest-impact landing page improvements:
- Match headline to ad copy — if your ad says “Google Ads Management for E-commerce,” your landing page headline should reflect that exact promise
- Single, clear CTA — one button, one goal per page
- Remove navigation — dedicated landing pages with no header navigation reduce distraction and improve conversion
- Add social proof above the fold — a client logo strip, a review rating, or a specific result (“Our clients average 3.8x ROAS”) placed near the top increases trust before the user decides to bounce
- Mobile loading speed — over 60% of paid clicks are on mobile; a 3-second load time costs conversions
Step 5: Use Audience Layering
Audience layering lets you bid more aggressively on users who have stronger purchase signals. This improves ROAS without reducing reach.
Audiences to layer with bid adjustments:
- Customer match list (existing customers) — +30–50% bid adjustment
- Remarketing lists (past site visitors) — +20–40%
- Similar audiences to converters — +10–20%
- In-market audiences matching your product category — +10–15%
Set audiences to “Observation” mode first to gather data without restricting reach, then adjust bids based on the ROAS data you collect.
Step 6: Review Your Bidding Strategy Against Your Data Volume
Smart Bidding strategies (Target ROAS, Target CPA, Maximize Conversion Value) require sufficient conversion data to work properly. The general threshold is 30–50 conversions per campaign per month before Smart Bidding can reliably optimize.
Common mistake: Setting a Target ROAS of 5x on a campaign that only generates 8 conversions per month. Google can’t learn from that data, and the algorithm will either under-deliver or overspend on bad clicks.
Fix: If you’re below 30 conversions/month:
- Use Maximize Conversions (no ROAS target) to gather data first
- Consolidate campaigns to pool conversion signals
- Lower your ROAS target temporarily (even 1.5x) to let Smart Bidding learn, then increase it gradually
Step 7: Run a Search Impression Share Analysis
If your ROAS is acceptable but volume is low, you may be losing to competitors on impression share. Pull the Impression Share column in your campaigns view.
- Search Impression Share lost (budget): increase budget or improve Quality Score
- Search Impression Share lost (rank): improve ad relevance, landing page experience, or increase bid
- Search top IS: what percentage of the time your ad shows at the top — correlates with CTR and conversion rate
What a Strong ROAS Improvement Process Looks Like
ROAS doesn’t improve from one single change. It improves from making five to seven small, measurable optimizations in sequence, over 60–90 days, with proper A/B testing and patience during Smart Bidding learning periods.
If your Google Ads account isn’t hitting its ROAS targets, Microdigm’s paid media team offers full account audits and ongoing management. Get in touch to discuss your campaigns.