We prefer public UK sources that people can check for themselves. Calculator pages list specific links where they apply.
Preferred references
- NHS.uk pages for adult health guidance
- GOV.UK collections such as drink-drive limits and physical activity guidelines
- Widely used equations described plainly on the page (for example Mifflin St Jeor for resting calories)
What we do not claim
Linking an NHS or GOV.UK page does not mean the NHS or government endorses this website. It means visitors can read the same public guidance we had in mind.
Methods without a single public page
Some fitness tools use established formulas. When there is no tidy public URL, we describe the method on the calculator page and keep limitations visible.
Keeping sources current
If guidance changes, we update links and reviewed dates. If you find a broken or outdated source, use our corrections page.
Related: Editorial policy · Corrections