UK keyword research: why Keyword Planner and Ahrefs disagree

What to take away

How each tool reports UK search volume

Google Keyword Planner asks you to set a location and a language before it returns anything. Choose United Kingdom and English, and the figures you see are UK-only. The catch is the band. Broad match returns a range rather than a single figure, and that range widens as demand falls. A term with modest demand can land in the same band as one with several times the searches.

Place names create a second problem. The ONS publishes the standard UK geography hierarchy of nations, regions and local authority districts, and that is usually the level at which local intent sits. If your list ignores it, "Kent" and "Kensington" blur together.

Ahrefs works differently. It returns a single estimated figure for the country you select, plus its own keyword difficulty score and a clicks-per-search estimate. The numbers come from its own crawl and clickstream panel rather than Google's first-party data, so they can differ sharply from Keyword Planner on the same term.

Using the tools for UK searches

Their differences matter when you are planning content for a UK audience.

When the two disagree on a term, read the disagreement in three steps. First, check whether the Ahrefs figure falls inside the Keyword Planner band: if it does, the tools agree and only the format differs. Second, if it falls outside, confirm both tools are set to the United Kingdom and that Keyword Planner's location is not a single region or city. Third, look at whether the term is seasonal: a single monthly estimate can sit outside a band that reflects a different month. Only a gap that survives all three checks is a real difference between the data sources.

Where Google Keyword Planner earns its place

Keyword Planner sits inside Google Ads, so it speaks the same language as your paid campaigns. If you are setting a monthly UK budget, the bid estimates it returns relate directly to the account you will run.

Its documentation on using Keyword Planner explains the match types and the location settings, and it is worth reading once before you export anything. For organic planning, the tool's strength is seasonality. You can view twelve months of UK demand for a head term and see which months carry the weight before you commit a calendar.

Where Ahrefs earns its place

Ahrefs is built for lists. One figure per keyword per country means you can drop a thousand terms into a spreadsheet and sort without cleaning bands first. It also publishes a free keyword difficulty checker that explains how the score is calculated, which helps when you decide whether a term is worth chasing.

Do not treat that score as settled, though. Our guide to UK keyword difficulty scores sets out how the main providers differ, and why two tools can disagree sharply on the same term.

Pair all of this with your own data. If you already rank for a term, Search Console tells you the position and the queries you actually receive, and that beats any third-party estimate. Ahrefs also groups near-duplicates under a parent topic, so you can see how many pages a subject really needs.

Free and paid tools in one workflow

Keyword Planner costs nothing beyond a Google Ads account, which you can open without spending. Ahrefs is subscription only and priced in US dollars, so a UK buyer carries the exchange rate on top.

Semrush sits in the same bracket as Ahrefs, and the same test applies to it: check the country setting before you trust any figure. A rank taken from a global dataset tells you little about a UK page.

Most small teams do not need both paid tools. Start with Keyword Planner for demand, then move to a paid suite only when you are building clusters at scale. Our round-up of free keyword research tools for UK small business owners covers the middle ground.

Common questions

Is Google Keyword Planner accurate for UK search volume?

It gives a band rather than a figure, so it is directional rather than exact. Use it to compare terms against each other within the UK market, not to predict sessions.

Which tool is better for long-tail UK keywords?

Ahrefs, usually. It returns a single figure per term and keeps low-volume keywords in one list, where Keyword Planner hides them behind wide bands.

Can I use both together?

Yes, and most UK teams do. Pull volumes from Keyword Planner, then move your shortlist into Ahrefs for difficulty and grouping before you write.

Does Ahrefs replace Semrush for UK research?

Not necessarily. Both cover the UK and differ mainly on interface and price. Pick one, then spend the difference on content.