---
title: "Free domain authority checker"
url: "https://lookvalid.com/tools/domain-authority-checker.md"
canonical_url: "https://lookvalid.com/tools/domain-authority-checker"
last_updated: "2026-10-17"
type: "tool"
summary: "Check the authority of a domain for free: a 0 to 100 score built from the Common Crawl web graph and the Majestic Million, with the ranks and the formula shown."
related: ["https://lookvalid.com/docs/api/domain-authority.md"]
---

# Free domain authority checker

Check the authority of a domain for free: a 0 to 100 score built from the Common Crawl web graph and the Majestic Million, with the ranks and the formula shown.

Enter a domain. We score its standing on the web from 0 to 100 using open ranking lists, and show every rank that went into the score.

## Facts

- Free, no account needed. Rate limited per visitor.
- Runs the `domain-authority` product. The same lookup through the API costs 10 credits.
- API reference: [domain-authority](https://lookvalid.com/docs/api/domain-authority.md)

The score combines three rankings: the harmonic centrality and the PageRank of the domain in the Common Crawl web graph, and its position in the Majestic Million list of the most linked-to sites. Each ranking is turned into a signal between 0 and 100 and the three are weighted into one score.

The formula and the weights are printed under the result, so you can check the arithmetic yourself.

## Related

- [Domain Authority reference](https://lookvalid.com/docs/api/domain-authority.md)