Key Takeaways
- Seven metrics define keyword health: CTR, Quality Score, Conversion Rate, CPA, Impression Share, Search Lost IS, and ROAS
- No metric tells the full story in isolation: a high CTR with a low CVR signals a landing page problem, not a keyword problem
- Quality Score is the most commercially impactful metric because it directly determines your cost per click through a multiplier mechanism
- Statistical significance matters: do not pause or scale a keyword until it has accumulated at least 100 to 200 clicks of data
- A weekly 30-minute review routine focused on the right metrics in the right order compounds into dramatic campaign improvement over time
The Google Ads interface displays over 40 reportable metrics. Most advertisers focus on the wrong four or five, misread the relationships between metrics, and make optimisation decisions that feel logical but move performance in the wrong direction. Understanding which metrics define keyword performance and how to read them together is the foundational skill that separates campaigns that improve over time from those that plateau or degrade.
This guide covers the seven metrics that actually govern keyword performance, how to diagnose problems from metric patterns rather than individual numbers, how to set thresholds appropriate for your business, and how to structure a weekly review process that compounds improvement. For the broader keyword strategy that this measurement process feeds, read our guide on optimising keywords for Google Ads success.
The 7 Metrics That Define Keyword Performance
These seven metrics collectively describe what is happening at every stage of the keyword's commercial journey, from how often the ad appears, to how often it is clicked, to whether those clicks convert into commercial outcomes.
Click-Through Rate (CTR)
What it measures: The percentage of users who see your ad and click it. Why it matters: CTR is the most accessible lever for improving Quality Score, because Expected CTR is one of the three sub-components Google uses to calculate QS. A low CTR signals that your ad is not relevant enough to the query to earn the click. Benchmark: For Australian Search campaigns, a CTR of 3.5 to 5.5% is average. Above 6% is strong. Below 2% warrants ad copy investigation.
The most common cause of low CTR is failing to include the exact keyword in Headline 1. A user who types 'web designer Melbourne' and sees an ad titled 'Digital Marketing Solutions' is not receiving a relevant match signal. Rewriting Headline 1 to mirror the keyword phrase, then adding a specific benefit in Headline 2, typically improves CTR by 1.5 to 2 percentage points within 2 weeks.
Quality Score
What it measures: Google's 1 to 10 composite rating of your keyword's relevance, built from Expected CTR (35%), Ad Relevance (35%), and Landing Page Experience (30%). Why it matters: Quality Score is not just a diagnostic metric. It is a commercial one. A keyword with QS 8 pays approximately 32% less per click than one with QS 5, in the same auction against the same competitors. QS 3 pays a 150% premium. Improving Quality Score is the highest-return single action available in any Google Ads account.
To see your Quality Score sub-components, go to Keywords, add the Quality Score columns via the columns selector, then also add Expected CTR, Ad Relevance, and Landing Page Experience as separate columns. Any component rated 'Below Average' is a specific, addressable gap. See the official Google Ads Quality Score guide for the technical detail on how sub-scores are evaluated.
Conversion Rate and Cost Per Acquisition
Conversion Rate measures how many clicks become conversions (leads, calls, purchases). CPA measures the cost of each conversion. These two metrics together reveal the commercial efficiency of the keyword, not just its traffic efficiency. A keyword with excellent CTR and QS but poor CVR is generating clicks without commercial value. This is usually a landing page problem rather than a keyword problem.
The diagnostic test: If CTR is strong (above 4%) but CVR is poor (below 1.5%), the keyword itself is attracting the right user but the post-click experience is failing to convert them. Check the landing page: does its headline match the ad? Does it load in under 3 seconds on mobile? Is there a single clear CTA above the fold? These landing page factors typically explain 80% of CVR underperformance.
Keyword Performance Health Checker
Enter your keyword's current metrics to get an instant health score and a prioritised action list.
Want someone to interpret your keyword data and tell you exactly what to fix?
Book a free 30-minute account review with Nel. We will open your Google Ads account live, diagnose the performance gaps across your keyword list, and give you a prioritised action plan. No obligation.
Book your free consultationReading Metrics Together: The 5 Diagnostic Patterns
Google Ads performance problems are rarely caused by a single metric in isolation. Experienced account managers read metric combinations to diagnose root causes accurately. Acting on a single metric without understanding its relationship to others often leads to the wrong fix.
| Pattern | Symptom | Root Cause | Right Fix | Wrong Fix |
|---|---|---|---|---|
| Pattern 1 | High CTR + Low CVR | Landing page fails to convert relevant traffic | Fix LP: remove nav, shorten form, match H1 to ad | Pause keyword (it IS working) |
| Pattern 2 | Low CTR + Low QS | Ad copy is irrelevant to keyword intent | Rewrite Headline 1 to include exact keyword | Increase bid (won't fix relevance) |
| Pattern 3 | High spend + Zero conversions | Keyword has wrong intent (informational, not commercial) | Pause keyword, check search terms, add negatives | Lower bid (still wastes budget) |
| Pattern 4 | Low IS + Good QS + Good CVR | Budget is limiting reach of a profitable keyword | Increase daily budget on this campaign | Increase bid (budget, not rank, is the issue) |
| Pattern 5 | Good CTR + Good QS + High CPA | Too many irrelevant queries triggering the keyword | Mine search terms, add negatives, tighten match type | Reduce all bids (good keywords also get cut) |
Read these patterns from left to right. Identify the symptom first, then trace to the root cause before taking any action.
Setting Performance Thresholds for Your Business
Industry benchmarks give you a starting point but your actual thresholds should be calculated from your business economics. The correct threshold for any performance metric is the value at which the keyword stops being commercially viable, not the value at which it underperforms a generic industry average.
For CPA specifically: your maximum allowable CPA equals your average customer lifetime value multiplied by your target payback period. A trades business with an average job value of $850 and a repeat rate that makes lifetime value $2,200 can afford a much higher CPA than a business with a $150 average transaction and no repeat business. Set your CPA threshold based on your economics, then review all keywords against that threshold.
The Weekly Keyword Review Process
Keyword performance does not stay constant. CPCs shift with competitor activity, Quality Scores erode as ad copy ages, and search term drift introduces irrelevant queries over time. A structured weekly review is not optional for accounts spending $1,000 or more per month. It is the mechanism that prevents gradual performance degradation.
| Day | Task | Time | What to Look For |
|---|---|---|---|
| Monday | Search Term Report review | 20 min | All queries from last 7 days. Tag irrelevant terms for negatives. Flag converting new terms. |
| Tuesday | Negative keyword update | 10 min | Add all tagged terms. Apply at campaign level where possible. Check for brand conflicts. |
| Wednesday | Quality Score check | 15 min | Filter keywords by QS. Flag any QS below 5. Plan ad copy or LP fix for flagged terms. |
| Thursday | Bid and CPA review | 10 min | Sort by CPA descending. Raise bids on keywords converting under 0.7× target CPA. Review zero-conv spend. |
| Friday | Record weekly KPIs | 5 min | Log CTR, CPC, conversions, CPA, ROAS. Compare to last week. Note top action for next week. |
Total: 60 minutes per week. Maintained for 6 months, this routine outperforms any single optimisation technique.
When to Pause, Scale, or Optimise a Keyword
The decision to pause, scale, or continue optimising a keyword should be made from data, not intuition. The following framework applies once a keyword has accumulated the minimum data threshold of 100 to 200 clicks.
At DigiFix, every keyword decision in every managed account follows this framework. Our weekly review log documents every change and its measured outcome, creating a traceable history that makes subsequent decisions progressively more precise. See our full Google Ads management service for how this process is applied across client accounts.
Want your keyword data interpreted by an expert every week?
Book a free 30-minute consultation with Nel. We will review your current keyword performance, identify the metrics that are out of range, and give you a specific 30-day action plan for improving results. No obligation, no hard sell.
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