Google Keyword Planner
Google's own keyword research and volume tool, sitting inside the Ads interface and drawing on the same demand data that advertisers bid against.
Analogy Mental model
The rate card Google's advertising division publishes for anyone considering the neighbourhood.
In practice What you actually do
Use the start-with-a-website option: paste a competitor's high-converting page and see which terms Google itself considers the best match. Then pull the top-of-page bid range as a rough proxy for commercial value, because advertisers only pay those prices where the traffic converts.
Where people get burned Pitfalls
Accounts that have never spent see only broad buckets such as one thousand to ten thousand. Borrow access from someone actively running campaigns and the same query returns monthly volumes precise to the nearest ten, plus twelve months of seasonality.
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