Free AI share of voice calculator
Turn the answers you collected from ChatGPT, Perplexity, Gemini and AI Overviews into share of voice against your competitors, with net sentiment and an honest margin of error.
- Share of voice and mention rate for you and every competitor you track
- A 95% range on each number, so you know when a gap is real
- How many more answers you need before the number is reliable
Free. No sign-up. Runs in your browser, nothing is uploaded.
Enter your counts
Prompts × assistants × repeats. 15 prompts in 4 assistants is 60 answers.
| Brand | Mentions | Positive | Neutral | Negative |
|---|
First row is your brand. Sentiment columns are optional.
A competitor ahead outside the margin of error? That gap is the coverage they have earned on the sources assistants read. We can show you which sources, and what it takes to close it.
Book a strategy callWhat each number tells you
The formulas are standard and shown here, so you can check the maths or rebuild it in a spreadsheet.
Mention rate
Mentions divided by answers checked. The share of buyer questions where an assistant names you at all.
Share of voice
A brand’s mentions divided by the total mentions of every brand in the table. It only covers the brands you track, so add your real shortlist rivals.
Net sentiment
Positive minus negative, divided by all rated mentions, times 100. Runs from minus 100 to plus 100.
95% range and answers needed
A Wilson score interval, which holds up at small samples and at rates near 0% or 100%. Answers needed uses 1.96² × p(1 − p) ÷ margin²: at a 50% rate, 385 answers for ±5 points and 97 for ±10.
How to get numbers worth calculating
Write 10 to 20 buyer questions
The questions a buyer asks before shortlisting: “best X for Y”, “X alternatives”, “X vs Y”. The AI visibility checker writes them for you.
Ask every assistant, fresh
Run each question in a new, logged-out session of each assistant you track, and note which brands each answer names.
Repeat monthly
Same questions, same assistants, every month, so the trend means something. Import the checker CSV here each time.
Assistants recommend the brands their sources recommend. Share of voice rises when more of the comparisons, reviews and editorial pieces those engines retrieve name you, and name you well. For the sentiment side, our guide to brand sentiment analysis covers how to read and improve it.
Three checks, in the order that matters
Access first, then mentions, then how you stack up against competitors. Each tool runs free with no sign-up.
AI crawler checker
Checks your robots.txt against 18 AI agents, so you know search and answer bots can reach your pages.
Open the crawler checkerAI visibility checker
Builds the buyer questions for your category and scores whether ChatGPT, Perplexity, Gemini and AI Overviews mention you.
Open the visibility checkerAI share of voice calculator
Turns your answer counts into share of voice, net sentiment and a margin of error against named competitors.
You are hereShare of voice questions
How the maths works and what to do with the result. Still unsure? Book a strategy call and we will read your result with you.
How do you calculate share of voice in AI answers?
Run the same set of buyer questions through the AI assistants you care about and count how many answers name each brand. Share of voice is one brand's mentions divided by the mentions of all the brands you track. Mention rate is a brand's mentions divided by the number of answers you checked.
How many prompts do I need for a reliable share-of-voice number?
It depends on the precision you want. At a 50% mention rate you need about 385 answers to be within plus or minus 5 points at 95% confidence, and about 97 answers for plus or minus 10 points. The calculator works this out for your actual rate.
Why does the calculator show a range instead of one number?
AI answers vary from run to run, so a count from a sample is an estimate. The range is a 95% Wilson score interval: with that sample, the true mention rate is likely to fall inside it. When two brands' ranges overlap, the gap between them is not yet established.
How do you measure sentiment in AI-generated brand mentions?
Read each answer that names a brand and rate the mention positive (recommended or praised), neutral (listed without judgement) or negative (criticised or warned against). Net sentiment is positive minus negative, divided by all rated mentions, on a scale from minus 100 to plus 100.
Does this tool query ChatGPT or Perplexity for me?
No. Querying AI engines automatically needs paid API access, so this calculator does the measurement maths on counts you collect. The free AI visibility checker gives you a prompt set and a scorecard, and its CSV export imports here.
Is my data sent anywhere?
No. Everything is calculated in your browser and saved only in your browser's local storage so it is still there when you come back.
Behind on share of voice?
We earn your brand the editorial mentions AI assistants draw on, and report progress with the same metrics this calculator uses.
Book a strategy callA senior strategist replies within one business day.