About AllHealthCalc
Free health and fitness calculators that show their work — the formula, how to read the result, and where it falls short.
Who's behind AllHealthCalc
AllHealthCalc is built and maintained by Gong Baolin, founder of WisePath Technology LLC, a Delaware-registered company. Baolin's background is in software engineering and consumer tools, and that is exactly the lens this site is built through: clear, fast calculators with the math made transparent. We are not a clinic and we do not practice medicine. Instead, every calculator and guide is researched against recognized public health guidelines and reviewed by a real person before it ships. You can connect with Baolin on LinkedIn.
Why we built this
Most online health calculators are black boxes. They spit out a number with no explanation of the formula behind it, no sense of how accurate it is, and no honest account of what it cannot tell you. That is a problem in health, where a misread number can cause real worry or false reassurance. AllHealthCalc exists to do the opposite: every tool names its formula, links to the guideline it is based on, explains how to interpret the result, and is explicit about its limits and when you should talk to a professional instead.
How we source our data
Our formulas and reference ranges come from recognized, publicly available guidelines, including:
- Body Mass Index categories from the World Health Organization (WHO);
- General nutrition and physical-activity guidance from the U.S. Centers for Disease Control and Prevention (CDC);
- Widely published, peer-reviewed formulas such as Mifflin-St Jeor for metabolic rate and the Karvonen method for heart-rate zones.
Where a formula is a simplification of a more complex reality, we say so on the page rather than hiding it.
Our approach to accuracy
Each calculator's math is cross-checked against known reference values before it ships, and we are deliberately transparent about where we simplify. A water-intake "rule of thumb," for example, is a starting estimate, not a prescription — and we label it that way. Each tool states its assumptions, and our Medical Disclaimer explains the limits in full.
Privacy by design
Your health figures are nobody's business but yours. Every calculation runs entirely in your browser. We never transmit, store, or sell the numbers you enter, and we require no account or sign-up. The few tools that remember entries (like the period tracker) keep that data only on your own device. You can read the specifics in our Privacy Policy.
How we stay free
AllHealthCalc is operated by WisePath Technology LLC and supported by unobtrusive third-party advertising. That is what lets us keep every tool free for everyone, with no paywalls and no premium tier.
Get in touch
Spotted an error, or want a calculator we don't have yet? We'd genuinely like to hear it — reach us through the Contact page.