You’re spending £2,000, £5,000, or even £10,000 a month on Google Ads. Your agency or consultant sends you monthly reports full of numbers, percentages, and fancy charts.
But do you actually understand what you’re looking at?
Most business owners don’t. They nod along in meetings, trusting that “CTR is up 2.3%” is good news, without really knowing what CTR means or why it matters.
Here’s the uncomfortable truth: if you don’t understand your Google Ads metrics, you can’t know if you’re getting value for money. You’re flying blind, hoping your agency knows what they’re doing.
We’ve managed many Google Ads accounts for UK businesses. Seen business owners waste thousands because they didn’t understand the numbers. We’ve also seen savvy owners who ask the right questions and get dramatically better results.
This is your plain-English guide to the 10 Google Ads metrics that actually matter – what they mean, why they’re important, and what good looks like.
Why Understanding Google Ads Metrics Matters
You’re the One Writing the Cheques
Even if you hire an agency, you’re responsible for the budget. Understanding metrics helps you:
- Know if you’re getting value for money
- Ask intelligent questions in review meetings
- Spot problems before they waste thousands
- Make informed decisions about budget allocation
- Hold agencies accountable for results
Not All Metrics Are Created Equal
Google Ads reports can show 50+ different metrics. Most are vanity metrics that look impressive but don’t impact your bottom line.
These 10 metrics are different. They directly affect your profitability and business growth.
Knowledge Prevents Exploitation
Dishonest agencies hide behind jargon and cherry-picked metrics. When you understand the numbers, you can’t be fooled by smoke and mirrors.
The 10 Essential Google Ads Metrics
1. Impressions: How Many People See Your Ad
What It Means: An impression is counted every time your ad is shown, regardless of whether someone clicks it.
If your ad appears in search results 10,000 times in a month, you’ve got 10,000 impressions.
Why It Matters: Impressions show whether your ads are actually being shown. Low impressions might mean:
- Your budget is too small
- Your bids are too low
- Your keywords have low search volume
- Your targeting is too narrow
What Good Looks Like: There’s no universal “good” number – it depends on your market size and budget. But impressions should be:
- Consistent month-to-month (not wildly fluctuating)
- Growing if you’re increasing budget
- High enough to generate meaningful clicks
Red Flags:
- Impressions dropping significantly month-over-month
- Very low impressions (under 1,000/month for most campaigns)
- Impressions high but clicks very low (see CTR below)
Example: A local plumber targeting “emergency plumber Leeds” gets 2,500 impressions monthly. That’s healthy for a local service business. A national e-commerce store targeting “running shoes” with 2,500 impressions would be concerningly low.
2. Clicks: How Many People Click Your Ad
What It Means: A click is counted when someone actually clicks on your ad to visit your website.
Why It Matters: Clicks are your first conversion point. Without clicks, you can’t get leads or sales. But clicks alone don’t equal success – you need the RIGHT clicks from qualified prospects.
What Good Looks Like: You want enough clicks to generate meaningful data and conversions, but not so many irrelevant clicks that you waste budget.
Typical monthly click volumes:
- Small local business: 50-200 clicks
- Medium business: 200-1,000 clicks
- Large business: 1,000+ clicks
Red Flags:
- High clicks but no conversions (targeting problem)
- Clicks declining while impressions stay steady (CTR issue)
- Suspiciously high click numbers with no business results (click fraud or bot traffic)
Important: Never judge success by clicks alone. A campaign with 100 clicks and 10 sales beats a campaign with 1,000 clicks and 5 sales.
3. Click-Through Rate (CTR): The Percentage Who Click
What It Means: CTR shows what percentage of people who see your ad actually click on it.
Formula: (Clicks ÷ Impressions) × 100
If your ad gets 100 clicks from 5,000 impressions: (100 ÷ 5,000) × 100 = 2% CTR
Why It Matters: CTR indicates how relevant and compelling your ads are. High CTR means your ads resonate with searchers. Low CTR means your ads aren’t attractive or are showing to the wrong audience.
Google also uses CTR as a quality signal. Higher CTR can improve your Quality Score, lowering your costs.
What Good Looks Like:
Search Network:
- Below 2%: Poor (needs improvement)
- 2-5%: Average
- 5-8%: Good
- 8%+: Excellent
Display Network:
- Below 0.3%: Poor
- 0.3-0.5%: Average
- 0.5-1%: Good
- 1%+: Excellent
Red Flags:
- CTR consistently under 2% on search campaigns
- CTR dropping month-over-month
- Some keywords with 10%+ CTR while others have under 1% (needs restructuring)
How to Improve Low CTR:
- Improve ad copy relevance
- Add compelling calls-to-action
- Use ad extensions
- Refine keyword targeting
- Test different headlines
4. Cost Per Click (CPC): What You Pay Per Click
What It Means: CPC is the average amount you pay each time someone clicks your ad.
Formula: Total Cost ÷ Total Clicks
If you spend £1,000 and get 200 clicks: £1,000 ÷ 200 = £5 CPC
Why It Matters: CPC directly impacts your profitability. Lower CPC means you can get more clicks from the same budget.
What Good Looks Like: CPC varies enormously by industry:
Low CPC Industries (£0.50-£2):
- Retail and e-commerce
- Food and restaurants
- Arts and entertainment
Medium CPC Industries (£2-£5):
- Professional services
- Home services
- Travel
High CPC Industries (£5-£20+):
- Legal services
- Finance and insurance
- B2B services
Red Flags:
- CPC increasing month-over-month without explanation
- CPC significantly higher than industry benchmarks
- Huge CPC variation between similar keywords (targeting or quality issues)
How to Lower CPC:
- Improve Quality Score
- Use more specific, long-tail keywords
- Optimize landing pages
- Improve ad relevance
- Use negative keywords to filter irrelevant searches
Important: Don’t obsess over lowering CPC if it reduces conversion quality. A £10 CPC that converts at 10% beats a £2 CPC that converts at 1%.
5. Quality Score: Google’s Grade for Your Ads
What It Means: Quality Score is Google’s 1-10 rating of your ad’s relevance and quality. It’s based on:
- Expected CTR
- Ad relevance
- Landing page experience
Why It Matters: Quality Score directly affects:
- Your CPC (higher scores = lower costs)
- Your ad position
- Whether your ads show at all
Two advertisers bidding the same amount can pay vastly different CPCs based on Quality Score.
What Good Looks Like:
- 1-3: Poor (major issues to fix)
- 4-6: Average (room for improvement)
- 7-8: Good (competitive)
- 9-10: Excellent (optimal)
Aim for 7+ on your main keywords.
Red Flags:
- Quality Scores consistently below 5
- Scores dropping over time
- Low scores on high-volume keywords
How to Improve Quality Score:
- Align ad copy closely with keywords
- Improve landing page relevance and speed
- Organize campaigns tightly (small, focused ad groups)
- Use keyword insertion in headlines
- Add sitelink and callout extensions
Example: Two solicitors bid £5 for “family lawyer Manchester”:
- Solicitor A: Quality Score 8, pays £3.50 CPC
- Solicitor B: Quality Score 4, pays £6.20 CPC
Quality Score saved Solicitor A 44% on every click.
6. Conversion Rate: Percentage Who Take Action
What It Means: Conversion rate shows what percentage of clicks result in a desired action (purchase, form submission, phone call, etc.).
Formula: (Conversions ÷ Clicks) × 100
If you get 100 clicks and 5 conversions: (5 ÷ 100) × 100 = 5% conversion rate
Why It Matters: This is where the rubber meets the road. High conversion rate means your traffic is qualified and your website is effective. Low conversion rate means you’re wasting money on unqualified clicks or your website isn’t converting visitors.
What Good Looks Like:
By Industry:
- E-commerce: 2-4%
- Lead generation: 3-8%
- Professional services: 5-10%
- High-ticket B2B: 2-5%
By Conversion Type:
- Email signups: 5-15%
- Phone calls: 3-8%
- Purchases: 1-4%
- Quote requests: 3-10%
Red Flags:
- Conversion rate under 1% (major targeting or website issue)
- Rate declining over time
- High clicks but zero conversions
How to Improve Conversion Rate:
- Improve landing page design and copy
- Match landing page to ad message
- Simplify conversion process
- Add trust signals (reviews, guarantees)
- Optimize for mobile
- Use clear, compelling CTAs
Critical Point: Always define what counts as a conversion and track it properly. Without conversion tracking, you’re advertising blind.
7. Cost Per Conversion (Cost Per Acquisition): What You Pay for a Customer
What It Means: Cost per conversion shows the average cost to acquire one conversion (lead, sale, signup, etc.).
Formula: Total Cost ÷ Total Conversions
If you spend £2,000 and get 40 conversions: £2,000 ÷ 40 = £50 per conversion
Why It Matters: This is THE most important metric for profitability. If your cost per conversion is higher than your profit per customer, you’re losing money.
What Good Looks Like: Your cost per conversion must be significantly lower than your customer lifetime value.
Ideal Ratio:
- Customer LTV: £1,000
- Target Cost Per Conversion: £200-£300 (3-5x return)
By Business Type:
- E-commerce (low margins): £10-£50 per sale
- Professional services: £50-£300 per lead
- High-ticket B2B: £200-£1,000+ per qualified lead
Red Flags:
- Cost per conversion higher than your profit margin
- Costs increasing month-over-month
- Some campaigns with £20 cost per conversion while others are £200+ (optimization needed)
How to Calculate Your Maximum Acceptable Cost:
Example:
- Average sale value: £500
- Profit margin: 40% = £200 profit
- Close rate: 30% of leads become customers
- Maximum cost per lead: £200 × 0.30 = £60
Any cost per conversion above £60 loses you money.
How to Lower Cost Per Conversion:
- Improve conversion rate (same clicks, more conversions)
- Lower CPC (same conversions, lower cost)
- Better targeting (higher quality clicks)
- Optimize landing pages
- Exclude non-converting keywords
8. Return on Ad Spend (ROAS): Revenue vs. Spend
What It Means: ROAS shows how much revenue you generate for every pound spent on ads.
Formula: Revenue from Ads ÷ Ad Spend
If you spend £1,000 and generate £4,000 in revenue: £4,000 ÷ £1,000 = 4:1 ROAS (or 400%)
Why It Matters: ROAS directly shows profitability. It’s particularly important for e-commerce where you can track revenue per transaction.
What Good Looks Like:
Minimum Viable ROAS:
- E-commerce (low margins): 4:1 minimum
- E-commerce (high margins): 2-3:1 minimum
- Services (high margins): 3:1 minimum
Good ROAS:
- 5:1 or higher: Excellent
- 3-5:1: Good
- 2-3:1: Acceptable (depending on margins)
- Under 2:1: Usually unprofitable
Red Flags:
- ROAS under 2:1
- ROAS declining month-over-month
- Can’t calculate ROAS (conversion value tracking not set up)
Important Consideration: ROAS doesn’t account for:
- Product costs
- Fulfillment costs
- Overhead
- Customer lifetime value
A 3:1 ROAS might be unprofitable if you have 40% product costs and 20% fulfillment costs.
Example:
- Ad spend: £2,000
- Revenue generated: £10,000
- ROAS: 5:1
- Product costs (50%): £5,000
- Fulfillment (10%): £1,000
- Actual profit: £10,000 – £5,000 – £1,000 – £2,000 = £2,000
Real ROI: 100% (doubled your money after costs)
9. Impression Share: How Often Your Ads Could Show
What It Means: Impression share shows what percentage of possible impressions your ads actually received.
If there were 10,000 possible searches for your keywords and your ads showed 7,000 times, you have 70% impression share.
Why It Matters: Low impression share means you’re missing opportunities. Understanding WHY you’re missing impressions (budget or rank) determines how to fix it.
Types of Impression Share:
Search Impression Share:
- Total percentage of impressions you received
- Target: 80%+ for important campaigns
Lost Impression Share (Budget):
- Impressions lost because your budget ran out
- Indicates you need to increase budget
Lost Impression Share (Rank):
- Impressions lost because your ad rank was too low
- Indicates you need to increase bids or improve Quality Score
What Good Looks Like:
- 80%+ impression share: Excellent (dominating your keywords)
- 50-80%: Good (capturing majority of opportunities)
- 30-50%: Average (room to grow)
- Under 30%: Poor (missing most opportunities)
How to Improve Impression Share:
- Increase daily budget (if losing to budget)
- Increase bids (if losing to rank)
- Improve Quality Score (reduces required bid for rank)
- Add more relevant keywords
- Use bid adjustments for best-performing times/devices
Strategic Note: You don’t always need 100% impression share. If you’re profitable at 60% and increasing budget doesn’t improve profitability, stay where you are.
10. Search Terms Report: What People Actually Searched
What It Means: The Search Terms Report shows the actual search queries that triggered your ads, not just the keywords you bid on.
Why It Matters: This is where you discover:
- Unexpected keywords that convert well
- Irrelevant searches wasting budget
- Negative keywords to add
- New keyword opportunities
How to Use It:
Weekly Review:
- Look at all search terms that got clicks
- Identify irrelevant terms → add as negative keywords
- Identify high-converting terms → add as exact match keywords
- Identify new opportunities → create new ad groups
What to Look For:
Good Signs:
- Search terms closely match your keywords
- High-converting search terms
- Long-tail specific searches
Red Flags:
- Completely irrelevant searches getting clicks
- Branded competitor terms (unless intended)
- Question searches when you sell products (low intent)
- Generic single-word searches with no conversions
Example: You bid on “running shoes” (broad match).
Your Search Terms Report shows:
- “best running shoes for marathon” ✅ Relevant, add as keyword
- “cheap running shoes” ✅ Relevant but low margin, consider
- “running shoes repair” ❌ Irrelevant, add negative
- “running shoe laces” ❌ Irrelevant, add negative
Action Items from Search Terms:
- Add “running shoes repair” as negative keyword
- Add “running shoe laces” as negative keyword
- Create new ad group for “marathon running shoes”
- Add “cheap” as negative if you’re premium brand
Pro Tip: Check your search terms report weekly. Most wasted spend comes from irrelevant search terms that sneak through broad or phrase match keywords.
How These Metrics Work Together
Understanding individual metrics is important, but seeing how they interact is powerful.
The Profitability Chain:
Impressions → Clicks → Conversions → Revenue
Each stage has metrics that affect the next:
1: Visibility
- Metric: Impressions & Impression Share
- Goal: Get seen by enough qualified people
2: Interest
- Metric: CTR & CPC
- Goal: Get qualified clicks at reasonable cost
3: Action
- Metric: Conversion Rate & Cost Per Conversion
- Goal: Turn clicks into customers efficiently
4: Profitability
- Metric: ROAS & ROI
- Goal: Generate more revenue than you spend
Example of Optimization:
Scenario: Your campaign isn’t profitable.
1: ROAS
- If ROAS is under 2:1, investigate why
2: Cost Per Conversion
- If it’s too high, look at conversion rate and CPC
3: Conversion Rate
- If under 2%, your landing page or targeting needs work
4: CTR and CPC
- If CTR is low, improve ad copy
- If CPC is high, improve Quality Score
5: Search Terms
- Add negative keywords to filter irrelevant clicks
6: Quality Score
- Improve ad relevance and landing pages
What to Ask Your Agency in Every Meeting
Now that you understand the metrics, here are the questions to ask:
Monthly Questions:
- “What’s our ROAS this month and how does it compare to last month?”
- Gets to profitability immediately
- “Which campaigns have the best and worst cost per conversion?”
- Identifies where to invest more and where to cut
- “What did you learn from the search terms report this month?”
- Shows they’re actively optimizing, not just monitoring
- “How is our impression share and are we losing impressions to budget or rank?”
- Reveals growth opportunities
- “What’s our conversion rate and what are you doing to improve it?”
- Shows focus on efficiency, not just traffic
- “What experiments did you run this month and what were the results?”
- Good agencies test constantly
Red Flag Responses:
❌ “Clicks are up 20%!” (without mentioning conversions or cost) ❌ “We increased your Quality Score” (without showing impact on CPC or conversions) ❌ “Everything looks good” (without specific numbers) ❌ “That’s too technical to explain” (means they don’t want you to understand) ❌ Can’t easily pull up or explain any of these metrics
Common Metric Misunderstandings
Myth 1: “More Clicks = Better Performance”
Reality: 100 clicks from qualified buyers beats 1,000 clicks from random browsers. Quality over quantity always.
Myth 2: “Lower CPC = Success”
Reality: A £10 CPC that converts at 10% is far better than a £1 CPC that converts at 0.5%. Focus on cost per conversion, not CPC.
Myth 3: “High CTR Means It’s Working”
Reality: High CTR with low conversion rate means you’re attracting the wrong people. Relevance matters more than volume.
Myth 4: “Quality Score Doesn’t Really Matter”
Reality: Quality Score dramatically affects your CPC. The difference between a 5 and an 8 Quality Score can be 30-40% lower costs.
Myth 5: “ROAS Is All That Matters”
Reality: ROAS doesn’t account for profit margins, customer lifetime value, or business goals beyond immediate revenue.
Setting Up Proper Tracking
You can’t manage what you don’t measure. Here’s what you need:
Essential Tracking Setup:
1. Google Ads Conversion Tracking
- Track purchases, form submissions, phone calls, sign-ups
- Set conversion values where applicable
2. Google Analytics 4 Integration
- Link Google Ads and GA4
- Import conversions
- Track user behavior post-click
3. Call Tracking (If Applicable)
- Use call tracking numbers
- Attribute phone conversions to specific campaigns
4. CRM Integration (Advanced)
- Track which leads became customers
- Calculate actual customer value
- Measure true ROI
What to Track:
Minimum:
- Leads/sales (main conversions)
- Phone calls
- Form submissions
Ideal:
- All of the above plus:
- Micro-conversions (email signups, downloads)
- Customer lifetime value
- Lead-to-customer conversion rate
- Time to conversion
Industry Benchmarks: How Do You Compare?
Use these benchmarks to gauge your performance:
Average CTR by Industry:
- Arts & Entertainment: 10.67%
- Advocacy: 4.41%
- Auto: 4.00%
- B2B: 2.41%
- Consumer Services: 2.41%
- Dating: 6.05%
- E-commerce: 2.69%
- Education: 3.78%
- Employment Services: 2.42%
- Finance & Insurance: 2.91%
- Health & Medical: 3.27%
- Home Goods: 2.44%
- Legal: 2.93%
- Real Estate: 3.71%
- Technology: 2.09%
- Travel & Hospitality: 4.68%
Average CPC by Industry:
- Legal: £6.75
- Finance & Insurance: £3.44
- Technology: £3.80
- Employment Services: £2.04
- B2B: £3.33
- Consumer Services: £6.40
- E-commerce: £1.16
- Education: £2.40
- Real Estate: £2.37
(These are UK averages – your specific niche may vary)
The Bottom Line: From Data to Decisions
Understanding these 10 Google Ads metrics transforms you from a passive budget-holder to an active decision-maker.
You’ll know when to:
- Increase budget (high impression share loss due to budget + profitable ROAS)
- Pause campaigns (high cost per conversion + low ROAS)
- Optimize landing pages (good CTR + low conversion rate)
- Improve ad copy (low CTR + good impression share)
- Add negative keywords (search terms report shows irrelevant clicks)
Most importantly, you’ll spot problems before they waste thousands and identify opportunities to scale what works.
Your agency should be your partner, not your mystery box. These metrics are the shared language that makes that partnership work.
