You have a keyword list. Now you open a keyword tool and every phrase comes with numbers: volume 1,300, difficulty 42, CPC $3.80, a little trend line. What do these numbers mean? Which ones matter? And why does one tool say 1,300 searches while another says 2,400?
Let me explain each metric in plain words. By the end of this lesson, you will understand search volume, keyword difficulty, cost per click, traffic potential and seasonality. More importantly, you will know how to use them together to pick the keywords worth your time, and when to ignore them.
Keyword metrics are numbers that estimate how valuable or how hard a keyword might be. They help you prioritize the list you built in the lesson on keyword research for beginners.
The key word is estimate. Google doesn't publish exact search counts for every keyword. Some numbers come from Google's own tools, such as Keyword Planner and Google Trends. Others, like keyword difficulty, are calculated by third-party SEO tools, each with its own method. That's why two tools can show different numbers for the same keyword.
Here is a quick overview of the metrics in this lesson:
| Metric | What it estimates | Where you find it | How to use it |
|---|---|---|---|
| Search volume | Average searches per month | Keyword Planner, SEO tools | Gauge demand; compare keywords |
| Keyword difficulty | How hard it may be to reach page one | Third-party SEO tools | Pick battles you can win |
| Cost per click (CPC) | What advertisers pay for a click | Keyword Planner (bid ranges), SEO tools | Signal of commercial value |
| Traffic potential | Total visits the top page for a topic gets | SEO tools; your own judgment | See the whole topic, not one phrase |
| Seasonality / trend | How interest changes over time | Google Trends, Keyword Planner monthly data | Time your content; spot rising topics |
| Clicks | Real visits your site gets from a query | Google Search Console | Measure what actually happens |
What does search volume really tell you?
Search volume is the estimated number of times people search for a keyword per month. In Keyword Planner, Google calls it "average monthly searches": the average number of times people searched for a keyword and its close variants, based on the date range, location and search network settings you choose. By default, it averages over 12 months.
Three things are worth knowing:
- The numbers are rounded. Google says Keyword Planner's search volume statistics are rounded, so treat them as ballpark figures.
- Close variants are grouped. "apple pie recipe" and "apple pie recipes" may share one number.
- It's an average. A keyword showing 1,000 searches a month might get 3,000 in December and 200 in June.
Use volume to compare keywords and to spot demand, not to forecast exact traffic. And don't throw away low-volume keywords too fast. A phrase with 30 searches a month from ready-to-buy customers can be worth more than one with 3,000 searches from people who are just curious. Our blog covers this in how to find and interpret search volume and why zero-volume keywords can still win.
What is keyword difficulty, and should you trust it?
Keyword difficulty (often shown as KD, on a 0–100 scale) is a score that estimates how hard it would be to rank on page one for a keyword. It is not a Google metric. Each SEO tool calculates it in its own way, often looking mostly at how many and how strong the links are to the pages already ranking.
Because of that, I suggest you use difficulty as a first filter, then check the results page yourself. Here is how I would judge difficulty by eye:
- Search the keyword and look at the top 10 results.
- Are they huge brands, government sites and famous publishers, or smaller sites like yours?
- Do the top pages match the search intent well? If some don't, there is an opening.
- Are the top pages thorough and up to date, or thin and old?
- Do forums or Q&A sites appear? That often means Google can't find a great dedicated page yet.
A score of 20 in one tool might be 35 in another, so compare scores only within the same tool. For more detail, read our guide on keyword difficulty and how to use it. The lesson on competitor keyword research shows you how to find battles a smaller site can win.
What does cost per click (CPC) tell an SEO?
Cost per click (CPC) is what advertisers pay when someone clicks their ad for a keyword. You don't pay this for SEO. But it is a useful signal: if advertisers pay a lot for a click, that keyword probably brings in customers who spend money.
Keyword Planner shows two related numbers. The "top of page bid (low range)" approximates the 20th percentile of what advertisers have historically paid for a top-of-page bid, and the "high range" approximates the 80th percentile. Google says these bid ranges use data from the last 30 days, and some keywords with little data won't show them.
Keyword Planner also has a "Competition" column, labeled low, medium or high. Be careful here. Google defines it as the number of advertisers that showed on the keyword relative to all keywords. It is about ad competition, not how hard it is to rank organically. Many beginners mix these up.
Our blog explains CPC in more depth in what cost per click is and how to lower it.
Why traffic potential and clicks matter more than volume
Here is something that surprises many beginners: ranking first for a keyword does not mean you get all its searches as visits. Two ideas help.
Traffic potential: think in topics, not single phrases
A page that ranks well rarely ranks for just one phrase. A good guide to "how to store apples" may also rank for "keeping apples fresh", "do apples go in the fridge" and dozens of other variations. So the volume of one keyword can underestimate what a page could bring in. Some SEO tools estimate this "traffic potential" by looking at how much traffic the current top page for a topic gets across all the keywords it ranks for. You can make a rough version yourself by adding up the volumes of the close variants in your keyword group.
Clicks: not every search ends in a visit
Not every search leads to a click on a website. Sometimes the answer appears right on the results page, for example in an AI Overview or a quick fact. Sometimes ads and other features take the clicks. So two keywords with the same volume can send very different numbers of visitors. You can learn more about these features in the lessons on the search results page and AI Overviews and AI Mode.
For your own site, the most honest number is in Google Search Console. It shows impressions (how often you appeared), clicks (how often people came to your site) and click-through rate, which is clicks divided by impressions. Those are real numbers from your own pages, not estimates.
How do you spot seasonality with Google Trends?
Many keywords rise and fall with the seasons. "Apple picking" peaks in autumn. "Sunscreen" peaks in summer. "Tax return help" peaks near the filing deadline. If you only look at an average monthly volume, you miss this.
Google Trends shows how interest changes over time. It is based on a largely unfiltered sample of real Google searches. Each data point is divided by the total searches in that place and time, then scaled from 0 to 100. So 100 means peak relative interest, not 100 searches. A 0 means there wasn't enough data to show, which often happens with low-volume terms.
Use Trends to:
- See which months a topic peaks, so you can publish or update content a few weeks before.
- Compare two phrases to see which wording people prefer.
- Check whether a topic is growing, steady or fading over several years.
- Compare interest across regions if you serve more than one area.
Keyword Planner's monthly breakdown is a good second check, because Google notes that search traffic is influenced by seasonality, current events and other factors. Our guide on how to use Google Trends for SEO has step-by-step examples.
Try it: score and prioritize your keyword list
Open the keyword list you made in the last lesson and add these columns: Volume, Difficulty (or your eye-check rating), CPC, Season, Priority. Then follow these steps:
- Paste your keywords into Keyword Planner and copy average monthly searches and the top-of-page bid ranges.
- If you use an SEO tool, add its difficulty score. If not, rate each keyword "easy", "medium" or "hard" by looking at the top 10 results.
- Check your 10 most important keywords in Google Trends and note any peak months.
- Give each keyword a priority from 1 to 3. A "1" is closely tied to what you sell, has some demand and looks winnable.
- Pick your top 5 priority-1 keywords. These are your first pages to create or improve.
Here is an invented example of how two keywords might compare after scoring:
- "apple box delivery [city]": low volume, low difficulty, high business value, steady all year. Priority 1.
- "apple nutrition facts": higher volume, high difficulty (health and big publishers dominate), little business value. Priority 3.
Questions beginners ask about keyword metrics
Why do SEO tools show different search volumes?
Each tool uses its own data sources and methods to estimate volume, and Keyword Planner's numbers are rounded and grouped. Pick one tool for consistency, and treat all volumes as estimates.
Is a high-volume keyword always better?
No. Business value, intent and difficulty matter more. A small, specific keyword from buyers often beats a big, vague one.
Does Keyword Planner's "Competition" column show SEO difficulty?
No. Google defines it by how many advertisers showed on the keyword. It describes ad competition, not organic ranking difficulty.
What does 100 mean in Google Trends?
It marks the point of highest relative interest for that search in the time and place you chose. It is not a count of searches.
Use metrics to choose, then check the results page
In brief: search volume shows rough demand, keyword difficulty estimates competition (differently in every tool), CPC hints at commercial value, traffic potential reminds you to think in topics, and Google Trends shows seasonality. None of them are exact. Use them to shortlist, then look at the real results page and your own Search Console data before you decide.
Next, you will learn why smaller sites often win with specific, lower-volume searches in the lesson on long-tail keywords. If you would like our team to help you prioritize keywords for your business, feel free to request a free quote.