Medical & Fitness Disclaimer

Last updated: 2026-05-17.

FitMetricLab calculators are for educational and informational purposes only. They do not provide medical, nutritional, physiotherapy, coaching, or training advice. Results are mathematical estimates produced from the inputs you supply and from published formulas with known assumptions and known limits. They are not a diagnosis, a treatment plan, a prescription, or a substitute for consultation with a qualified professional.

Not Medical Advice

Nothing on FitMetricLab is intended to diagnose, treat, cure, or prevent any disease or condition. We are not licensed clinicians, physicians, registered dietitians, certified strength coaches, or sports scientists in any practitioner capacity through this site. If you have a medical condition, are pregnant, are recovering from injury, are on medication that affects heart rate or metabolism, or are otherwise uncertain about how a metric applies to your situation, consult a qualified physician or licensed professional before acting on any calculator output.

No Diagnosis, No Recommendation

No FitMetricLab tool is a diagnostic instrument or a recommendation engine. Output is a number derived from your inputs and a published formula. The site does not tell you what to eat, how to train, when to rest, or whether a measured value is safe or unsafe for you personally. You decide what, if anything, to do with the number.

Limits of the Formulas

Every formula on this site has assumptions and a range of validity. Heart-rate zone formulas, BMR equations, body-composition skinfold equations, and one-rep-max estimators are all approximations derived from population samples; individual error is typical. Where those limits are documented in the literature, we state them on the individual calculator page. Where they are not, we say so. None of these formulas account for individual differences such as cardiovascular conditions, medications, body geometry, training history, genetic variation, or environmental conditions like heat and altitude.

Particular Cautions

• Heart-rate metrics are estimates only. Do not use age-predicted maximum heart rate as a hard ceiling during exercise — measured response varies widely.
• Body composition calculators (skinfold, Navy, BMI, FFMI) are estimates against population samples. They are not body-scan results.
• Caloric and macro tools reflect population-average BMR equations. Real energy needs vary with thyroid function, body composition, NEAT, and other factors.
• Strength standards are reference distributions, not assessments of your training readiness.
• Running and cycling performance equivalents assume comparable conditions; weather, terrain, elevation, and fatigue alter real-world outcomes.

Advertising and Affiliate Disclosure

FitMetricLab does not currently carry third-party advertising or affiliate links. If advertising is introduced in future (for example via Google AdSense), it will be served only after you grant consent through a cookie banner. Advertisers will not influence calculator outputs, methodology notes, or any content on a tool page. Any affiliate links added later will be clearly marked, and any relationship will not affect the formulas, results, or methodology of any tool.

Liability

Use of FitMetricLab is at your own risk. Brightscale Labs Limited accepts no liability for decisions made on the basis of any result shown here. Limitations on liability are set out in full in our Terms of Use.

If You Are Unwell

If you are experiencing chest pain, severe shortness of breath, fainting, acute injury, disordered-eating symptoms, or any other medical emergency, seek immediate medical attention. FitMetricLab is not a substitute for emergency care, urgent advice, or ongoing clinical management. In the UK, contact NHS 111 for non-emergency advice or 999 for emergencies; in the EU, 112; in the US, 911.