Search volume

Search volume tells you roughly how many people search a term each month. It is the most common way to size demand for a topic, and the most commonly misread.

How it works

The primary source is Google's own Keyword Planner, part of Google Ads. Google describes it as showing estimates of how many searches a keyword gets each month. Third-party tools combine Keyword Planner data with clickstream panels and their own models, which is why two tools often disagree.

A few things are true for every source:

• It is an estimate. Treat 880 and 1,000 as "about the same".
• It is an average. Seasonal terms can spike several times above the yearly average in one month.
• It is per keyword, not per topic. Ten close variants of a phrase can add up to far more traffic than the head term suggests.
• Some keywords are not shown at all. Keyword Planner says very low volume or sensitive keywords are not discoverable or forecastable.

Why it matters for marketers

Volume sets the ceiling on traffic. It does not set the value. A query with 50 searches a month from people ready to buy can beat one with 50,000 from people looking for a definition. Pair volume with search intent and keyword difficulty before deciding.

Volume also overstates available clicks. When an AI Overview or featured snippet answers the query on the results page, many searchers never click anything. See zero-click search.

The long tail does not show up

Google said in 2019 that 15 percent of the queries it sees every day are ones it has never seen before. No volume tool can show those. Much real demand lives in specific, phrased-like-a-question queries that tools list as zero or ten. See long-tail keyword.

How it plays out on Reddit

Reddit is a good way to see demand that volume tools miss. A tool may show 10 searches a month for "invoice app that handles VAT for EU freelancers". Reddit may show a dozen threads asking exactly that, each with comments from people who had the same problem.

Two practical uses:

1. Validate low-volume keywords. If the question keeps appearing on Reddit, the demand is real even if the tool shows little.
2. Find the wording. Reddit posts show how buyers phrase the problem, which is often not how vendors phrase the solution.

And a thread that ranks for a modest-volume query keeps collecting readers for years. The Reddit SEO guide covers finding those threads.

Common mistakes

• Treating the number as exact. It is a modeled estimate.
• Skipping low-volume keywords. Many convert better precisely because they are specific.
• Ignoring seasonality. Look at the monthly trend, not just the average.

Frequently asked questions

Where does search volume data come from?

Google Keyword Planner is the primary source. Third-party SEO tools add their own data and models, so their numbers differ.

Is search volume accurate?

It is an estimate, often rounded or grouped. Use it to compare keywords, not to forecast exact traffic.

Should I target keywords with zero search volume?

Often, yes, if they match buying intent. Tools miss many real queries; Google says 15 percent of daily searches are brand new.

Sources

1. Google Ads Help: Use Keyword Planner
2. Google: Understanding searches better than ever before (BERT, October 2019)