If you’ve searched “how many keywords should I use for Google Ads,” you’ve probably landed on a dozen articles that give you a confident shrug wrapped in 1,500 words.
The frustrating reality is that most advice on this topic either vague out with “it depends” or throws out a number with no real explanation behind it. Neither is useful when you’re trying to build a campaign that actually generates leads.
So here’s the deal: this post gives you a direct answer, explains the reasoning behind it, and walks you through the structure decisions that matter just as much as the number itself.
The Short Answer – How Many Keywords Should You Use?
5 to 20 keywords per ad group.
That’s the practical sweet spot for most Google Ads campaigns, and it lines up with Google’s own guidance on ad group structure.
This isn’t a rigid rule. Some ad groups perform well with 8 keywords. Others need 15. What matters is that every keyword in a group is closely related to each other, to your ad copy, and to the landing page people land on after clicking.
The goal isn’t maximum keyword volume. The goal is tight relevance. Everything else follows from that.
Why Too Many Keywords Hurt Your Campaign
Is adding too many keywords bad for Google Ads?
The instinct makes sense: more keywords means more reach, more reach means more clicks, more clicks means more business.
In practice, keyword bloat is one of the most common reasons Google Ads campaigns underperform. Here’s why:
Lower Ad Relevance and Higher Costs
Google assigns every keyword in your campaign a Quality Score. This is a rating from 1 to 10 that reflects how relevant your keyword, ad, and landing page are to each other.
When an ad group is stuffed with dozens of loosely connected keywords, writing ad copy that speaks to all of them becomes impossible. Relevance drops. Quality Score drops. And when Quality Score drops, your cost-per-click goes up. You’re essentially paying a penalty for being unfocused.
Tight keyword groups make it easier to write highly relevant ads, which rewards you with better scores and lower costs.
Wasted Budget on Irrelevant Clicks
More keywords, especially when using broad match types, means more opportunities for your ad to show up for searches that have nothing to do with what you offer.
A roofing company with a bloated keyword list might find its ads showing up for “roof scene in a movie” or “roofing video games.” That sounds absurd, but it happens constantly on poorly structured campaigns. Every one of those clicks costs money and converts at zero.
Harder to Optimize Over Time
Large keyword lists are noisy. When you have 200 keywords across a campaign, spotting what’s working requires sorting through a mountain of data.
Lean, focused lists give you cleaner signals. You see faster what’s performing, make smarter adjustments, and improve results without guessing.
Why Too Few Keywords Also Causes Problems
Going too narrow has its own risks.
If you’re only bidding on one or two keywords, you’re assuming every potential customer uses the exact same search language you chose. They don’t.
Real people search in different ways – “emergency plumber near me,” “plumber available today,” “burst pipe help Sacramento” – all with the same intent, all using different words.
A healthy keyword list covers the realistic range of ways your audience searches for what you offer. The aim is relevance across natural variations, not just one phrase.
The Right Way to Think About Keyword Volume – Ad Group Structure
Here’s where most advice misses the point: the total number of keywords in your campaign matters far less than how those keywords are organized.
The unit that actually drives performance is the ad group or a cluster of closely related keywords that share the same ad copy and send traffic to the same landing page. Each ad group should cover one specific topic or service, nothing broader.
Here’s what that looks like in practice:
Example: A Roofing Company
| Ad Group | Sample Keywords |
| Roof Repair | roof repair near me, fix roof leak, roof damage repair |
| Roof Replacement | roof replacement cost, new roof installation, replace old roof |
| Emergency Roofing | emergency roof repair, roof leak tonight, urgent roof help |
Three ad groups. Each is tightly focused, with its own ad copy and landing page built around that specific service. That specificity is what drives clicks, conversions, and ROI. A well-structured campaign typically runs 3-6 ad groups, each with 5-15 keywords.
Understanding Keyword Match Types
The number of keywords is only part of the equation. How broadly or narrowly those keywords trigger your ads is the match type conversation, and it’s just as important.
| Match Type | How It Works | Best Used For |
| Broad Match | Ads can show for loosely related searches | Exploration (use with caution) |
| Phrase Match | Ads show when your phrase appears within a search | Balanced reach and relevance |
| Exact Match | Ads show only for very close matches to your keyword | High-intent, high-value terms |
Broad Match
The widest net. Google can show your ad for searches it considers related, which can mean relevant results or completely off-target ones.
It’s gotten smarter, but it still needs a strong negative keyword list to keep wasted spend in check. Don’t make it your primary match type.
Phrase Match
Your ad shows when someone’s search includes your keyword phrase, with possible words around it. Broader coverage than Exact, more control than Broad. For most SMBs, it’s the reliable workhorse.
Exact Match
Your ad only shows for searches that closely match your keyword, meaning the same with minimal variation. Highest relevance, lowest volume. Use it for your most valuable, high-intent terms, the searches where someone is clearly ready to buy or call.
READ: How Long Does It Take For Google Ads To Work
Don’t Forget Negative Keywords
Negative keywords tell Google which searches you don’t want your ad to appear for. Without them, your ads can show up for searches that are completely irrelevant to your business, burning budget on clicks that will never convert.
A few practical examples:
- A plumber might add “DIY,” “free,” and “how to” as negatives to avoid showing ads to people looking to fix it themselves
- A premium landscaping company might add “cheap” and “affordable” to filter out price-sensitive searches that don’t match their service level
- A B2B software company might add “jobs” to avoid showing up in hiring-related searches
Build your negative keyword list before you launch, then expand it regularly by reviewing your search term reports. The actual searches that triggered your ads.
A Simple Framework for Most Small Businesses
Bring it all together and here’s a starting structure that works for the vast majority of SMB campaigns:
- 2–5 tightly themed ad groups per campaign, one per service or product category
- 5–15 keywords per ad group, closely related, not loosely associated
- Phrase and Exact Match as your primary types, with Broad used sparingly
- A negative keyword list built before launch and updated regularly
- Search term report reviews every 1–2 weeks to catch wasted spend and find new opportunities
Start here, let your campaign gather data, and refine from there. The structure you build at the beginning determines how much useful signal you get and how easy it is to improve over time.
Build a Smarter Keyword Strategy
More keywords won’t save a poorly structured campaign. Fewer, more focused keywords will almost always outperform a bloated campaign built for volume over relevance.
If your current Google Ads campaign isn’t generating the leads you expected, the issue is usually structural, not just the keywords themselves. That’s exactly the kind of problem our team digs into.
Sierra Exclusive builds Google Ads management campaigns from the ground up around performance: proper structure, the right match types, and ongoing optimization that doesn’t just set it and forget it.
If you’d like a second set of eyes on your campaign or want to start fresh with a strategy built for your market, let’s talk.
Frequently Asked Questions
Can I use the same keyword in multiple ad groups?
Technically, yes, but avoid it. When the same keyword appears in multiple ad groups, Google decides which ad to show, and it may not pick the most relevant one. Use specific variations in each group instead.
How often should I update my keyword list?
Every 1–2 weeks when a campaign is new, and monthly once it’s stable. Review your search term reports, add negatives for irrelevant searches, and fold in any high-intent queries you’re missing.
Does more keywords mean my ads show more often?
Not necessarily. Google determines ad frequency based on Quality Score, auction dynamics, and budget. A smaller, high-relevance list will often outperform a bloated one.
What’s a good starting keyword count for a brand-new campaign?
Start with one or two ad groups and 8–12 keywords each. That’s enough to gather clean data without overcomplicating your setup.
Should I pause keywords that aren’t getting clicks?
Not right away. New keywords need time and data before drawing conclusions. If a keyword has been running for 30+ days with zero clicks and a reasonable budget behind it, then yes, pause it and reallocate spend to what’s working.
