SEMrush Keyword Research Tutorial: The Complete 2026 Guide

SEMrush ships four keyword research surfaces. Keyword Magic Tool holds 27.3 billion keywords across 142 countries, per SEMrush's Knowledge Base documentation (https://www.semrush.com/kb/262-keyword-magic-tool). Keyword Overview returns metrics on a single query. Keyword Gap compares your domain against four competitors. Keyword Strategy Builder clusters saved lists into topics.

The four tools chain into a single workflow. Keyword Magic Tool surfaces raw ideas at scale, while Keyword Overview scores individual terms for difficulty and intent. Keyword Gap then filters out terms you already rank for, leaving only new territory.

The 2026 release added Prompt Research inside the AI Visibility Toolkit. Per Brenna Kelly's April 2026 walkthrough on SEMrush Blog, the new module surfaces prompts people send to ChatGPT and Gemini, not just keywords typed into Google (https://www.semrush.com/blog/how-to-use-semrush-keyword-research/). Prompts behave differently than queries. They run longer and carry more intent.

The stack costs $139.95 per month for the Pro tier in 2026, per SEMrush's pricing page. The Guru tier runs $249.95. The Business tier runs $499.95. Track the spend before you scale exports.

Open Keyword Magic Tool. Type a seed term, for instance "project management software." Set the country database to your target market. The tool returns thousands of grouped variants in under three seconds.

The default sort favors search volume. Volume-first is the wrong default in 2026. Per Chris Hanna's May 2026 SEMrush Blog post, the volume-first heuristic breaks when AI Overviews absorb the head terms (https://www.semrush.com/blog/keyword-research/). Sort by Keyword Difficulty, filter to 0-49%, and review the long-tail residue.

Apply four filters in order. First, Broad Match contains. Second, Questions toggle for who/what/how phrasing. Third, KD% under 49. Fourth, search volume over 100. The intersection usually shrinks 20,000 raw terms down to 80-200 viable targets.

Pull Personal Keyword Difficulty next. PKD% scores difficulty against your specific domain authority. Per Kelly's 2026 guide, PKD% values below or equal to KD% signal realistic competition (https://www.semrush.com/blog/how-to-use-semrush-keyword-research/). Values above KD% signal a domain that needs authority work first.

Save the surviving terms to a Keyword Strategy Builder list. Click "+ Add to keyword list" on each row. The list becomes the working set for the next step.

Keyword Overview opens when you click any term from Magic Tool. The report shows search volume, KD%, intent classification, SERP features, and trend data over 12 months. The trend line tells you whether demand is rising, flat, or decaying.

Use the SERP feature column to flag AI Overviews. Per Hanna's 2026 framework, AI Overview presence drops organic CTR to roughly 0.6%, down 61% from pre-overview baselines. Flag these for content depth work, not for new targeting.

Keyword Gap compares your domain against competitors. Per SE Ranking's 2025 comparison of Ahrefs vs SEMrush, the SEMrush Keyword Gap tool handles four competitors per run while Ahrefs limits to three (https://seranking.com/blog/ahrefs-vs-semrush/). The Missing tab shows keywords competitors rank for that you do not.

Filter the Missing tab by volume over 100, KD% under 49, and exclude branded terms. The intersection produces 30-150 keyword candidates. Cross-reference these against your existing Keyword Magic Tool list to remove duplicates.

The output is a clean candidate set: 80-200 terms from Magic Tool, 30-150 gaps from Keyword Gap, deduplicated to roughly 100-250 final candidates. The set fits in one strategy session.

You open Keyword Strategy Builder, load your saved list, and click Cluster. The tool groups the list into topic clusters using shared SERP intent, shared parent topic, and shared URL ranking patterns. Each cluster shows total volume, page count to publish, and currently ranking URLs.

You audit each cluster against your existing content. Clusters without any ranking URLs get scheduled as net-new content work. Clusters where you rank but CTR is low get scheduled for a refresh cycle. Clusters where your own domain already fields competing URLs go to consolidation work to merge them.

You export the cluster plan as a CSV and import it into your editorial tracker. Per Kelly's 2026 walkthrough, this is the step where your keyword list becomes a publishing plan (https://www.semrush.com/blog/how-to-use-semrush-keyword-research/). Audit results drive the next 90 days of work.

You set up Position Tracking on the cluster's primary keywords. The tracker reports daily visibility against Google, ChatGPT, and Gemini starting from launch day. You correlate cluster performance against publishing dates and AI Overview rollouts.

Note the gap. This post synthesizes 2025 and 2026 data from four sources: SEMrush Blog's April 2026 walkthrough, SEMrush Blog's May 2026 framework, SEMrush's Knowledge Base documentation, and SE Ranking's Ahrefs vs SEMrush comparison. Two non-public PKD% scoring details remain undisclosed. Audit quarterly.