Share of voice in SEO estimates how much of the available organic visibility for a set of keywords belongs to your site. Most tools calculate it by weighting each ranking by the keyword's volume and an expected click-through rate for that position, then dividing your total by the total for everyone tracked. It turns many individual rankings into one comparable number, which is useful for reporting progress against competitors on a market rather than keyword by keyword.
How it is calculated
Methods differ between tools, which is why share of voice from one tool is not comparable with another. The general shape is consistent.
estimated clicks for a ranking = search volume x expected CTR at that position
share of voice = sum of your estimated clicks / sum of estimated clicks for all tracked resultsChoosing the keyword set
Share of voice is only as meaningful as the keywords behind it. A set dominated by broad informational terms will tell a different story than one built from commercial category terms. Many teams keep separate sets: one for the core category, one per product area, and one for comparison searches. Keep each set stable, since adding keywords changes the result.
Limits
The click-through rate assumptions behind most calculations are generic curves that do not account for ads, AI Overviews or rich results on a specific page. Share of voice therefore estimates visibility rather than measuring traffic. For AI answers, a separate measure is used; see AI share of voice.
Example
Reporting a category position
Imagine Saffronpeak, a fictional email testing tool, tracks two hundred category keywords against five competitors. Its share of voice rises across two quarters as new comparison and integration pages start ranking.
The report shows the trend by keyword group, so the team can see that the gain came from commercial terms rather than blog topics.
Common mistakes
Comparing across tools
Each tool has its own formula and CTR curve. Only compare share of voice within one tool and one keyword set.
Using a vanity keyword set
If the set is chosen to look good, the metric stops reflecting the market. Build it from the searches buyers make.
Questions
There is no universal benchmark. It depends on the keyword set and the number of competitors. Track the trend and compare against named rivals.
