Search volume is an estimate of how many times a keyword is searched in a chosen place over a month, usually shown as an average across the previous twelve months. It is a guide to demand, not a count of the visitors you will get.
How search volume works
The figures come from two kinds of source. Google’s own Keyword Planner, inside Google Ads, draws on Google’s search data, but it groups closely related terms together and, for accounts without active ad spend, shows broad ranges rather than single numbers. Third-party tools such as Semrush and Ahrefs build their own estimates from a mix of inputs, including clickstream panels and Google data, then model the rest. Their methods differ, so the same keyword seldom shows the same figure in two tools. All of them are estimates, not exact counts.
Location is the setting people most often get wrong. A tool set to global or to the United States shows numbers that have little to do with UK demand. For a UK business, set the location or database to the United Kingdom, which reflects people searching from here on google.co.uk, and narrow to a region or city where the tool allows. Spelling matters as well: UK forms such as “colour”, “tyres” and “aluminium” can show quite different volumes from their US equivalents.
Because the figure is a monthly average, it hides the shape of the year. A term with a steady-looking average may be searched mostly in one or two months. Google Trends shows that pattern over time, though as relative interest rather than absolute numbers.
Why it matters
Volume helps you decide where to spend effort. Between two terms with the same intent, the one searched more often is usually the better target for a main page, while low-volume variations are often better answered within that page or in its FAQs. It also sets realistic expectations: if hardly anyone searches for what you offer by name, SEO alone will not create demand, and paid or social channels may need to build it.
But volume is only one input. A term with a modest figure and clear buying intent, such as “commercial electrician Reading”, can be worth more to a small firm than a large informational term that brings readers who will never enquire. Many specialist B2B terms show little or no volume in tools yet still produce valuable searches.
Common mistakes
- Reading global or US volumes for a UK business.
- Treating the figures as precise. They are rounded estimates, so a gap between two similar numbers means very little.
- Chasing the biggest number regardless of intent or keyword difficulty.
- Dismissing terms marked zero or “no data”; tools often miss niche and newly emerging searches.
- Forgetting seasonality, so a page is planned or judged in the wrong month.
- Expecting traffic equal to volume. Even the top result takes only a share of the clicks, and a smaller share when ads, a map pack or an AI answer sit above it.
How to act on it
Check that every tool you use is set to the United Kingdom. Compare figures across two sources and use them to rank terms against each other rather than to forecast traffic. Then add your own evidence: impressions in Google Search Console for queries you already appear for are measured, not modelled, and are often a better guide for your site than any tool.
Weigh volume alongside intent, difficulty and what a customer from that search is worth to you. Doing that weighing, and turning it into a page-by-page plan, is what my keyword research service delivers.