Keyword Difficulty and Search Volume: How to Use Them

Short answer: Search volume estimates how often a phrase is searched, and keyword difficulty estimates how hard it is to rank for it, but both are modelled numbers that differ between tools. Use them to compare options inside one tool, not as exact measurements. Choose keywords by relevance and intent first, then by realistic difficulty for your site, then by volume. A phrase with modest volume and a clear match to your page often beats a high-volume phrase that you cannot satisfy or rank for.

Almost every keyword tool shows two headline numbers next to each phrase: a monthly search volume and a difficulty score. They look precise, so it is tempting to sort a list by volume, filter by difficulty and publish content for the top of the list. That approach often fails. The numbers are useful, but only when you understand where they come from, what they leave out and how to combine them with judgement. This guide explains both metrics, their limits and a simple method for choosing keywords. If you are new to the topic, start with the beginner keyword research guide.

What search volume really measures

Search volume is an estimate of how many times a phrase is searched in a month, usually averaged over a year and often for one country and language. Tools build it from several sources, such as search advertising data, clickstream panels and modelling, so two tools can show very different numbers for the same phrase. Search advertising tools may also group close variants together, which inflates a single phrase. Volume does not tell you how many people click a result, because many searches end on the results page, a point explained in zero-click search, and it does not tell you how many different people searched.

Several things affect how much to trust a number:

Seasonality: an annual average hides peaks, so check the trend over the year.
Location and language: a global figure is a poor guide for one market.
Variants: singular, plural and reworded phrases may be merged or split.
New topics: new phrases often show zero volume while people already search for them.
Rounding: low numbers are often bucketed, so ten and thirty may look identical.

Treat volume as a rough scale: tiny, small, medium or large. The difference between 900 and 1,100 is noise, while the difference between 90 and 9,000 is meaningful.

What keyword difficulty really measures

Keyword difficulty is a score, often from 0 to 100, that tries to express how hard it would be to reach the first page. Each tool calculates it differently. Many rely mainly on the number and quality of links pointing to the pages that currently rank, and some add other signals. A score of 40 in one tool is not equal to a score of 40 in another. Search engines do not publish a difficulty score and do not use one, so the number is a third-party model of the competition.

Difficulty also ignores things that matter in practice. It rarely accounts for how well a page matches the intent, how strong the brand is, how fresh the content is, whether the results page is dominated by video, forums or shopping listings, or whether your site already has authority on the topic. Two keywords with the same score can be very different tasks. Use the number to rank candidates against each other, then read the actual results page to judge them properly.

Start with intent, then check the numbers

Before looking at either metric, ask what the searcher wants and whether your page can deliver it. Search the phrase, study the top results and note their format, depth and angle. If the results are product pages and you plan a blog post, the intent does not match. If they are comparison lists and you plan a definition, you are aiming at the wrong need. The framework is explained in the search intent guide. A keyword that fits your page and your audience is worth more than a larger one that does not, because visitors who find what they expect stay, read and act.

Where difficulty and volume mislead

Common traps include these:

Chasing volume. High-volume terms are usually broad and competitive, and the traffic they bring converts poorly.
Avoiding every high score. A strong site with relevant content can rank for terms that a weak site cannot, so judge difficulty against your own site.
Trusting zero volume. Specific, new or niche phrases may be searched often enough to matter, even when a tool shows nothing.
Ignoring clusters. One page often ranks for dozens of related phrases, so the total opportunity is bigger than the single keyword suggests.
Copying a competitor’s list. Their authority and goals may differ from yours.
Treating the score as permanent. Results change, so recheck before large investments.

A practical selection method

Use a simple scoring routine for each candidate keyword and keep it consistent across your list.

Relevance: does it match something you offer or can credibly explain? Discard it if not.
Intent match: can your page type satisfy the searcher better than the current results?
Competition on the page: who ranks, and how do they compare with your site in authority and depth?
Volume tier: is it tiny, small, medium or large in your market?
Business value: would a visitor from this search be useful to you?

Pick a primary keyword and a few supporting phrases for each page, and map them so that pages do not compete with each other, as described in the keyword mapping guide. Where two pages target the same phrase, merge or differentiate them, using the keyword cannibalisation fix.

Why long-tail phrases are often the best start

New and smaller sites usually succeed first with specific phrases, because competition is lower and intent is clearer. A long phrase such as how to fix duplicate title tags in WordPress has far less volume than title tags, but the searcher is closer to an answer and the competing pages are fewer. A set of such pages builds topical coverage and links, which later helps broader terms. The method is covered in the long-tail keywords guide. Combine several small opportunities into a cluster instead of betting on one big term.

Volume and difficulty in different markets

Numbers change with language and country. A phrase that is crowded in English may be almost unoccupied in another language, and a term that looks small globally may be large in one country. When you work on several markets, pull volume and difficulty separately for each one, using the local language and the local spelling, and do not translate a keyword list word for word, because people search with different phrases in different places. Check the local results page too, since the competitors, the result formats and the dominant sites differ. This is why local keyword research matters, as explained in multilingual keyword research. Use the same selection method in each market and expect different winners.

Use your own data as the real source

Once a site has impressions, Search Console is a better source than any estimate. It shows the queries that already bring impressions, your average position and your click-through rate for each page. Look for queries where you rank on the second page, since small improvements there can produce results faster than new content, and for queries with many impressions but few clicks, which may need a better title or snippet. Pair the queries with the pages that receive them, as described in the performance report guide. Your own data reflects your market, your brand and your seasonality, which tools can only approximate.

Check with a sample before committing

Before producing a series of articles, test a few candidates. Publish a small set, wait long enough for indexing and observe impressions, positions and engagement. If impressions appear and rankings climb, extend the cluster. If nothing happens, review intent, content quality, internal links and technical access before blaming the keyword. Measuring the effect of changes is covered in how to test SEO changes. Keep a simple sheet with the keyword, the tool’s volume and difficulty, the date, the page and the result, so that over time you learn how reliable the numbers are for your niche.

Site SEO AI Audit crawls your site and ranks fixes by the points they add, so you can make sure the pages you target are crawlable, have unique titles, headings and structured data, and are linked from other pages before you judge a keyword. The first audit of up to 200 pages is free; larger sites can see the pricing page. Site SEO AI Audit does not read your analytics.

The bottom line

Keyword difficulty and search volume are rough, tool-specific estimates. Use them to compare candidates, not to predict results. Decide on relevance and intent first, read the real results page, judge competition against your own site and start with specific phrases you can win. Then let your own Search Console data guide the next round.

FAQ

Why do two tools show different search volumes?

They use different data sources and models, and may group variants differently. Compare phrases within one tool and treat the numbers as approximate scales.

What is a good keyword difficulty score?

There is no universal answer, because each tool scores differently and sites differ in authority. Newer sites usually start with lower scores and more specific phrases.

Should I ignore keywords with zero search volume?

Not always. New, niche or very specific phrases often show zero but still have searchers, so check related queries and the results page before discarding them.

Do search engines use keyword difficulty?

No. Difficulty is a third-party estimate of competition. Search engines rank pages using their own systems and do not publish such a score.

Is search volume the same as traffic I will get?

No. Traffic depends on your ranking position, the features on the results page and how appealing your title and snippet are, so it is usually only a fraction of the volume.