There are specific KPIs that you can use to measure SEO results: - Growth of organic visits on the site. You can use Google Analytics, that is free, or other web analytics tools to measure this KPI. - Improved average position in search results for relevant keywords. You can use the Google Search Console to track the ranking of your website for the relevant keywords. - Average Click Through Rate (CTR). You can use the Google Search Console to measure the Click through rate.