GEO Metrics: Essential KPIs for Measuring Success in AI Search
GEO metrics explained: visibility rate, share of voice, citation rate, sentiment and position, with formulas, a worked example and how often to measure each.
Key takeaways
- Five metrics describe AI search performance: visibility rate, share of voice, citation rate, sentiment and average position.
- Every GEO metric is a ratio over a fixed prompt set, so it only means something if the prompts, engines and region stay constant.
- Visibility tells you whether you appear; citation rate tells you whether the engine trusts your pages enough to link them.
- AI answers vary run to run, so track trends across daily checks rather than reading a single answer.
GEO metrics are the numbers that show how often, how well and how favorably AI engines present your brand: visibility rate, share of voice, citation rate, sentiment and average position. Each one is measured by running a fixed set of prompts against AI engines and scoring the answers, because there is no rank to read off a results page.
This is the reference page for those definitions. The sibling guides cover the reporting shift (from clicks to citations), the concept of AI visibility (what AI visibility is) and the visits themselves (AI referral traffic in GA4).
What are the core GEO metrics?
| Metric | What it answers | Formula | Read it as |
|---|---|---|---|
| Visibility rate | Do engines mention us? | Answers that mention the brand ÷ total answers × 100 | Higher is better; compare against competitors |
| Share of voice | How much of the conversation do we own? | Brand mentions ÷ mentions of all tracked brands × 100 | Relative to the competitive set |
| Citation rate | Do engines link to our pages? | Answers that cite your domain ÷ total answers × 100 | Measures trust in your content |
| Sentiment | How are we described? | Scored 0 to 100 across mentions | Watch the trend and the wording |
| Average position | Are we named first or last? | Mean order of the brand among brands named in an answer | Lower is better |
GeoGen reports visibility, sentiment, average position, mentions and citations in exactly these terms, so the definitions below match what you see in the dashboard.
How do you calculate visibility rate?
Visibility rate is the percentage of tracked AI answers that mention your brand. If you run 50 prompts on 4 engines, that is 200 answers per round. If your brand appears in 34 of them, your visibility rate is 17%.
Three rules keep the number honest:
- Fix the prompt set. Changing prompts changes the metric. Add prompts deliberately and note the date.
- Separate branded from non-branded prompts. Branded prompts (“Is Acme any good?”) will always show you. Non-branded, high-intent prompts (“best project tools for agencies”) measure real discovery.
- Report by engine. A blended 17% can hide 40% on one engine and 0% on another.
How do you measure share of voice in AI search?
Share of voice compares your mentions with the mentions of every brand you track. It is the metric that tells you whether a rising visibility rate is real progress or just a growing category.
Worked example, 100 answers about a project management category (illustrative numbers):
| Brand | Answers naming it | Share of voice |
|---|---|---|
| You | 30 | 25% |
| Competitor A | 45 | 37.5% |
| Competitor B | 30 | 25% |
| Competitor C | 15 | 12.5% |
| Total mentions | 120 | 100% |
Note that shares are computed on mentions, not answers, because one answer can name several brands. Competitor discovery matters here: if you only track the three rivals you already know, a fourth brand can take share unnoticed. GeoGen detects competitors automatically from the answers it records.
What is citation rate and why does it differ from visibility?
Citation rate is the percentage of answers that link to your domain as a source. Visibility is about the brand being named; citation is about your pages being used.
The gap between them is diagnostic:
- High visibility, low citations: engines know you from third-party sources (reviews, listicles, forums) but do not use your own pages. Fix your on-site answers.
- High citations, low visibility: your content is used as a source but the brand is not the recommendation. Strengthen brand signals and comparison coverage.
To see which URLs are cited, track citations at domain and URL level. For engines that expose the searches they run while answering (GeoGen reads query fan-outs for Grok and Perplexity today), you can also see which sub-questions your pages fail to answer.
How is sentiment scored?
Sentiment measures the tone of the sentences in which your brand appears. GeoGen scores it from 0 to 100. A single number is useful for trend lines, but the actionable part is the recurring wording: “affordable but limited”, “reliable”, “hard to set up”. Those phrases tell you which messages to reinforce on your site and in third-party coverage.
What does average position mean in an AI answer?
When an answer lists several brands, average position is the mean rank at which yours is named. Being first in a list of five carries more weight than being fifth, since the first named option is the one many readers take. Track position alongside visibility: a brand with 25% visibility at position 1.4 is in a stronger place than one with 25% at position 4.2.
Which metrics matter for which goal?
| Goal | Primary metric | Supporting metric |
|---|---|---|
| Get discovered | Visibility rate on non-branded prompts | Share of voice |
| Become the source | Citation rate | Cited URLs by page type |
| Fix reputation | Sentiment | Wording of mentions |
| Win the recommendation | Average position | Visibility by engine |
| Prove business impact | AI referral visits and conversions | Branded search trend |
For the business-impact row, see AI search ROI, which covers how to report these numbers upward.
How do you set up GEO measurement in practice?
- Write 30 to 50 prompts that mirror real buying questions, split into non-branded and branded.
- Choose the engines your customers use and keep them fixed.
- Add 3 to 5 direct competitors so share of voice has a denominator.
- Record visibility, citations, sentiment and position every day.
- Review weekly averages; report monthly.
A tracking platform automates steps 2 to 4: GeoGen runs your prompts daily across 16 engines and reports each metric above per engine, per region and per competitor. See pricing for the plans, or start with a single engine through ChatGPT monitoring.
Do these metrics replace traditional SEO metrics?
No. Rankings, impressions and organic sessions still describe Google organic performance. GEO metrics add the layer that those tools cannot see: what the AI says before anyone clicks. Pew Research found that people clicked a traditional result in 8% of visits when an AI summary appeared, versus 15% when it did not (900 U.S. adults, March 2025). Fewer clicks make the exposure inside the answer the part you most need to measure.
Frequently asked questions
What is the most important GEO metric?
Visibility rate is the best starting point because it answers the basic question of whether AI engines mention your brand at all. It is the percentage of tracked answers that name your brand. Add citation rate and share of voice once visibility is measurable, because they explain why and against whom.
What is the difference between visibility rate and citation rate?
Visibility rate counts answers that mention your brand by name. Citation rate counts answers that link to your domain as a source. An engine can recommend you without linking you, and it can cite your page without naming your brand, so the two numbers often differ.
How do you calculate share of voice in AI search?
Divide your brand's mentions by the total mentions of all tracked brands (yours plus competitors) across the same prompts and engines, then multiply by 100. If you are named 30 times and the competitive set is named 120 times in total, your share of voice is 25%.
What is a good visibility rate?
There is no universal benchmark, because the rate depends on prompt set, category and engines. Compare against your direct competitors on identical prompts instead. In GeoGen's web hosting report the top brand reached 10.5% on non-branded prompts, so single digits can be normal in a crowded category.
How often should I measure GEO metrics?
Collect data daily and review weekly. AI answers change between runs, so a single day is noise. Weekly and four-week averages show real movement, and a monthly review is enough for reporting to stakeholders.
Can Google Analytics measure GEO performance?
Only partly. Google Analytics shows visits that arrive from AI assistants, which is the outcome. It cannot show the answers where you were mentioned but not clicked, which is where most of the exposure happens. You need prompt-level tracking for that.
