What an Authority Score actually measures (and what it does not)

A domain Authority Score is a single number, 0–100, that compresses an enormous link graph into something you can glance at. That compression is useful — and it is also where most people fool themselves.

What it is

The score is derived from the structure of links between domains across the public web. Domains that are linked to by many other independent, authoritative domains score higher. It is logarithmic: moving from 20 to 30 is common; moving from 70 to 80 is rare and slow.

What it is not

It is not a Google ranking. It does not measure traffic, revenue, or content quality. Two sites with the same score can have wildly different search performance. Treat it as one instrument on the dashboard, not the whole dashboard.

How to actually use it

• Watch the trend, not the digit. A site moving 41 → 44 over a quarter is a healthier signal than a static 60.
• Compare like with like. A 3-month-old site at 8 and a 10-year-old site at 8 are not the same story.
• Pair it with referring domains. The score is the summary; referring-domain changes are the cause. When the score moves, the why is in the link changes.

A new or low-traffic domain often scores 0 — that is not an error, it simply has no measurable authority yet. It climbs as it earns links. Monitoring it daily from day one means you see the inflection the moment it happens.