Guide · Practitioner
Measuring Citation Share
Citation share is the percentage of cited sources in AI answers that point to your domains, out of all sources cited for a prompt set. Measure it by logging every linked source per answer, grouping by domain, and dividing your count by the total. Our view: track owned and earned citation share separately, because third-party pages describing you often matter as much as your own site.
Points marked "Our view" are interpretation; examples are illustrative.
On this page
- What counts as a citation?
- How do you calculate citation share?
- Why separate owned and earned?
- How do you log citations?
- How does citation share differ by engine?
- How do you find gaps?
- How do you improve owned citation share?
- How do you improve earned citation share?
- Which pitfalls should you watch for?
- Which of your pages get cited?
- How often should you measure?
- How do you explain citation share to stakeholders?
- Exercise
- Checklist
- From MentionX data: how citations are distributed
- Worked example: Ledgerline measures its citation share
- How do you handle engines that rarely cite?
- How do you count a page cited twice in one answer?
- How do you group URLs?
- What sample size do you need?
- How does citation share relate to share of voice?
- How do you set up the tracking sheet?
- How do you check that a page really mentions you?
- What does a good trend look like?
- Common questions
- Related
- Sources
Checked on 31 October 2026. "Our view" marks MentionX opinion. Ledgerline is a fictional company used for illustration.
What counts as a citation?
A citation is a source the engine links to as supporting its answer: inline numbered links, source cards, a sources panel or link lists. Google describes AI Overviews and AI Mode showing supporting links, which must be indexed and eligible to show with a snippet (Google). Perplexity answers include cited sources (Perplexity). ChatGPT search shows links to sources (OpenAI).
Our view: count a URL once per answer, even if it's cited several times, and ignore links the engine shows only as "related" suggestions unless you track them separately.
How do you calculate citation share?
| Metric | Formula |
|---|---|
| Owned citation share | Citations to your domains ÷ all citations |
| Earned citation share | Citations to third-party pages that mention you ÷ all citations |
| Answer citation rate | Answers citing your domain ÷ all answers with citations |
| Domain share | Citations per domain ÷ all citations |
Worked example (fictional): across 300 answers there are 1,200 citations. 60 point to your site (5% owned share) and 150 point to review and media pages that mention you (12.5% earned share).
Why separate owned and earned?
Our view: engines often rely on independent sources for "best" and comparison prompts, and on vendor pages for factual or how-to prompts. Google's rater guidelines ask raters to look for what outside, independent sources say about a website or creator (Google). Separating owned and earned shows which lever to pull.
How do you log citations?
For each answer:
- Record every cited URL.
- Normalise to domain and page.
- Tag the domain type: owned, competitor, review site, media, forum, reference, other.
- Flag whether a third-party page mentions you.
Our view: flagging mentions requires opening pages, so sample: check the top 50 cited third-party URLs each month.
How does citation share differ by engine?
Engines cite differently, so compare within an engine. Our view: an engine that shows few links will produce volatile shares on small samples. Report the citation count alongside each share.
How do you find gaps?
Filter citations for answers where a competitor is mentioned or recommended and you aren't. Rank domains by frequency. Our view: the top domains are your earned-media and outreach targets; the cited competitor pages show content formats engines find useful. See tracking competitors.
How do you improve owned citation share?
Our view: publish pages that answer specific questions directly, keep facts current, and make sure pages are indexable and snippet-eligible, which Google requires for supporting links (Google). Google says unique, non-commodity content likely matters more than any other suggestion in its guide (Google).
How do you improve earned citation share?
Our view: keep review profiles accurate, contribute expertise to publications and communities, and correct outdated third-party pages. Avoid paid links without disclosure; Google's spam policies cover link schemes (Google).
Which pitfalls should you watch for?
- Counting repeated links in one answer multiple times.
- Mixing engines into one share without weighting.
- Ignoring earned citations.
- Reporting shares without counts.
Which of your pages get cited?
Our view: list your cited URLs by frequency each month. You'll often find a handful of pages earn most citations: glossary entries, pricing, comparison or how-to pages. Keep those accurate first. Pages that never get cited despite targeting tracked prompts are candidates for rewriting with clearer, more specific answers.
How often should you measure?
Our view: monthly, on the same prompt set as your mention tracking, so you can compare mention share and citation share side by side. A rising mention share with flat citation share suggests engines know you from third-party sources rather than your site.
How do you explain citation share to stakeholders?
Our view: use a simple sentence: "Of every 100 sources AI engines cited for our category prompts, 5 were our site and 12 were other sites that mention us." Then show the top cited domains as a ranked table. Most people grasp this faster than a chart. Add one example answer with its sources highlighted so readers see what a citation looks like in practice, and state which engines and how many answers the numbers cover.
Exercise
Take 50 answers with citations from one engine. Log every cited URL, tag domain types and calculate your owned and earned citation share. List the five domains cited most when a competitor is recommended.
Checklist
- Citation definition written down
- One count per URL per answer
- Domains tagged by type
- Owned and earned share separated
- Shares reported with counts, per engine
- Gap list of domains each month
From MentionX data: how citations are distributed
Method. Read-only aggregate queries over MentionX scans from 22 August to 29 October 2026 (UTC): 2,217 engine runs (2,154 completed) across 18 anonymised projects and six engines.
Citation share depends on whether an engine cites at all. In our sample, some engines left most answers without any links, which makes their citation share unstable:
| Engine | Brand mentioned | Answers with no citations |
|---|---|---|
| Gemini | 47.3% | 50.7% |
| OpenAI | 42.9% | 30.2% |
| Perplexity | 31.5% | 4.1% |
| AI Mode | 31.3% | 12.6% |
| Copilot | 26.0% | 47.0% |
| DeepSeek | 24.0% | 99.0% |
The kinds of pages cited matter for where you can win share:
| Cited URL type | Share of 9,750 citations |
|---|---|
| Blog or article | 19.6% |
| Homepage | 10.0% |
| Review page | 2.7% |
| Docs | 2.6% |
| Pricing | 1.9% |
| Wikipedia | 1.6% |
Our view: report citation share only for engines that cite often enough to give a stable number, and track mentions for the rest. The URL mix shows that much of the share goes to third-party pages, so owned content alone rarely moves the total much.
Limits. A convenience sample of mostly B2B software projects, run through engine APIs, which can behave differently from the consumer apps. Perplexity, Copilot and DeepSeek figures come from a single day (26 October 2026), so treat them as a snapshot, not a trend.
Worked example: Ledgerline measures its citation share
Ledgerline is a fictional accounts-payable tool. Figures are illustrative.
Ledgerline runs 60 comparison and how-to prompts three times each in two engines that usually cite. It logs every cited URL and tags each one as Ledgerline-owned, earned (a third-party page naming Ledgerline) or other.
Ledgerline's owned share is small, and its earned share is concentrated in one review site. Competitor A is cited across several independent comparison articles. The team lists the prompts where Competitor A is cited and Ledgerline isn't. It finds two missing topics on its own site and three comparison articles that don't mention it. It plans two new pages and an outreach list, and agrees to re-measure in six weeks.
How do you handle engines that rarely cite?
If an engine leaves most answers without links, a small number of citations will swing your share wildly. You have three options. Pool several weeks of runs before calculating. Report the count of citations alongside the share so readers see the base. Or drop citation share for that engine and track brand mentions instead. Our view: the third option is usually the most honest for engines that rarely cite.
How do you count a page cited twice in one answer?
Decide once and write it down. Most teams count unique URLs per answer, so a page cited twice in one answer counts once. Some count each citation. Either is fine if you're consistent, because the trend is what matters. Changing the rule mid-way makes old and new numbers incomparable.
How do you group URLs?
Group by domain for an overview and by page for action. A domain view shows you're losing to a review site; a page view tells you which article to approach. Tag pages by type, such as review site, publisher, forum, vendor blog or documentation, so you can see which kinds of source each engine leans on.
What sample size do you need?
More runs give steadier numbers. Several runs per prompt across a few dozen prompts is a reasonable start for a single product area. If your weekly share moves more than your normal range, check whether the sample changed before you act.
How does citation share relate to share of voice?
Share of voice counts brand mentions in the answer text. Citation share counts links. A brand can be named without being cited, and a page can be cited without the brand being named in the text. Track both: mentions show whether buyers hear your name, and citations show which sources shape the answer.
How do you set up the tracking sheet?
Use one row per cited URL per answer. Columns: date, engine, prompt, run number, URL, domain, page type, owned or earned, and whether your brand is named on that page. A pivot table then gives share by engine, by prompt group and by domain. Keep raw rows; totals alone can't be re-cut when someone asks a new question.
How do you check that a page really mentions you?
Engines sometimes cite a page for a general point, and the page may not name your brand at all. Open a sample of earned citations each month and confirm the mention. If a page no longer names you, perhaps because it was updated, tag it so it doesn't inflate your earned share. Our view: a quick monthly spot check of ten or so URLs is enough to keep the numbers honest.
What does a good trend look like?
A steady rise in owned and earned share on the prompts you targeted, with no matching rise on prompts you didn't touch, is the clearest sign your work helped. If every prompt rises at once, an engine change is the likelier cause. Check a few untouched control prompts each month for that reason.
Common questions
Is citation share the same as share of voice? No. Share of voice counts mentions in the answer; citation share counts cited links.
Which engines should I include? Those your buyers use that cite often enough to give stable numbers.
How often should I measure? Monthly is enough for most teams, with weekly checks on key prompts.
Related
Sources
- Google, AI features and your website; Succeeding in AI search; Search Quality Rater Guidelines; Spam policies
- OpenAI, Searching the web with ChatGPT
- Perplexity, How does Perplexity work?
All accessed 30 Oct 2026.
Questions
What's the difference between mention share and citation share?
Mention share counts how often answers name your brand. Citation share counts how often answers link to your domains as sources.
Should third-party pages about me count?
Track them separately. Owned citation share counts your domains; earned citation share counts other sites that describe you.
Do all engines show citations?
No. Some show links on every answer, some only on searches, and some rarely. Compare citation share within an engine.