Fact-Checking Policy

Choosing formulas

For every calculator we ship, we pick a formula that is widely cited in the peer-reviewed literature or in public-health guidance, with documented validity in adult populations. Where multiple formulas exist (e.g. ideal weight, body fat), we either pick the most-validated one or average across the major options.

Reviewing references

Each reference we cite is checked for: (1) authorship and source credibility, (2) currency, and (3) relevance to the claim. We prefer primary sources over secondary summaries.

Updating content

When public-health guidance is updated — for example, when the WHO revises BMI categories, when NICE publishes new ethnicity-specific thresholds, or when an AASM consensus statement changes recommended sleep duration — we update the affected calculator and guide and record the date.

Reporting issues

If you believe something on the site is inaccurate, please use our contact form with the topic "Correction request" and include a citation or a link to the corrected source. We review every report.