What is DA, PA, and SS in SEO?

Understanding DA, PA, and SS in SEO

When diving into SEO, you’ll often come across terms like DA (Domain Authority), PA (Page Authority), and SS (Spam Score). These metrics, developed by Moz, aren’t direct ranking factors used by Google, but they’re useful indicators for predicting how well a website or page might rank in search results.

Domain Authority (DA) measures how authoritative your entire domain is on a scale from 1 to 100. Think of it as a report card for your site’s credibility. A higher DA means search engines are more likely to trust your content. It’s influenced by factors like backlink profile strength, content quality, and overall domain age. For example, a new blog might start with a DA of 10–20, while established sites like Forbes or Wikipedia sit near 90+.

Page Authority (PA) zooms in further—it’s the predicted strength of a single page, not the whole site. Even if your domain authority is low, a well-optimized page with strong backlinks can have high PA and still rank well. This is especially helpful for targeting specific keywords or topics without relying solely on overall site strength.

Then there’s Spam Score, a metric that estimates how “spammy” a site appears based on characteristics found in penalized websites. A high SS doesn’t mean you’re penalized, but it’s a red flag to investigate—like an unnatural backlink pattern or keyword stuffing.

While Google doesn’t use DA, PA, or SS directly, they’re helpful benchmarks for comparing your site to competitors and identifying areas for improvement. Focus on earning quality backlinks, creating valuable content, and maintaining clean on-page SEO, and over time, these metrics—and your rankings—will follow.