You can find out how much a keyword costs using Google Keyword Planner or a keyword cost estimator like Semrush's Keyword Magic Tool. Google Keyword PlannerLog in to your Google Ads account. Google Keyword Planner will provide you with insights for each keyword. Keyword OverviewYou can also use Semrush's Keyword Overview tool to find out how much it costs to buy keywords on Google. To evaluate whether a high-cost keyword is worth it, you can run a small trial campaign using that keyword in Google Ads.