Disclaimer

Everything on HealthSand is general information for everyday decisions. It is not medical advice, and it is not a substitute for professional care.

Not medical advice

The calculators, timers, trackers, and guides on this site provide estimates and educational information about activity, sun exposure, hydration, sleep, and general wellness. They do not diagnose, treat, cure, or prevent any disease or condition, and they do not create a clinician–patient relationship. Individual needs vary widely with age, health history, medication, pregnancy, fitness, and environment, and no generic tool can account for all of that. If you have a medical condition, take medication, are pregnant, or are concerned about a symptom, please speak to a qualified clinician before acting on anything here.

Estimates and limits

Many results on this site are estimates built on published formulas, average values, and stated assumptions. Real calorie burn, sweat loss, vitamin D synthesis, and safe sun time vary from person to person and from day to day. Treat every result as a planning aid with a margin of error, not as a precise measurement. In particular, the vitamin D estimator gives an approximation, the weather risk checker gives a planning level rather than a guarantee of safety, and timers and trackers are wellness aids, not medical devices.

Urgent situations

Heat stroke, severe sunburn with blistering, breathing difficulty, chest pain, confusion, or any symptom that feels like an emergency should be treated as one: stop what you are doing, move to safety and shade, cool down, and seek emergency care. Do not delay care to consult a website.

Accuracy

We work to keep figures and guidance accurate and up to date, and we correct errors when they are reported. Even so, we cannot guarantee that every page is free of error or current with the latest research, and we are not liable for decisions made on the basis of this site's content. Use the tools as one input among others, alongside professional guidance where it matters.

External content

HealthSand does not link to external websites from its tool or guide pages. Any mention of a public guideline or standard is a general reference, not an endorsement, and the underlying guidance should be checked at its source where it matters.