Share of Voice (SEO) — Definition & Meaning
What is Share of Voice (SEO)?
Share of Voice in SEO is your domain's estimated percentage of total organic clicks or impressions across a fixed keyword set, compared to competitors ranking on the same terms. It's the single best metric for tracking category dominance because it accounts for both position AND search volume.
Key points
- Formula: Σ (your keyword volume × expected CTR at your position) / Σ (all competitors' same sum).
- Track weekly against a fixed keyword set — changing the set mid-track breaks trend comparability.
- SoV is superior to average position because it weights high-volume terms appropriately (position 3 on a 50K-volume term matters far more than position 1 on a 50-volume term).
- Use branded vs non-branded SoV separately — branded SoV shows brand demand growth; non-branded shows category-capture growth.
- LLM SoV (citations across ChatGPT / Perplexity / Gemini / Claude) is now a critical parallel metric — track both.
Example
In the "rank tracking" category, if your keyword set has 500K total monthly volume and your expected clicks are 25K, your SoV is 5%. Growing to 10% doubles category traffic without adding a single keyword.
Frequently asked questions
What's a good Share of Voice score?
Depends on category size and competitors. In a 5-competitor category, 20% SoV = parity. In a 50-competitor category, 5% SoV can be category leadership.
How is SoV different from average position?
Average position gives every keyword equal weight. SoV weights by volume × CTR — a truer picture of actual traffic dominance.
Should I track branded and non-branded SoV separately?
Yes — always. Branded SoV shows brand demand growth (a marketing outcome). Non-branded SoV shows category capture (an SEO outcome). Mixing them hides both signals.