Trustworthy wellness tools, free for everyone
HealthyLifeStyles makes accurate health insights accessible to anyone with a browser. We turn the same formulas clinicians and researchers rely on into fast, friendly calculators — with your privacy built in from the start.
- 53+ Free tools
- 9 Health categories
- 100% Free, no signup
- 0 Data points stored
Good health decisions start with good information
Most people don't have easy access to clear, reliable answers about their own health numbers. Calculators online are often cluttered with ads, hide their methods, or quietly harvest the personal details you type in. We built HealthyLifeStyles to be the opposite: clean, transparent, and genuinely private.
Our goal is simple — help you understand your body and your habits a little better, using methods you can verify, without asking for anything in return. Whether you're tracking a weight goal, dialing in your nutrition, training for a race, or just curious, the right tool should be one click away and free to use.
Our values
Four principles guide every tool and every line of content we publish.
-
Science first
Every calculator is built on established, peer-reviewed formulas — Mifflin-St Jeor for metabolism, the U.S. Navy method for body fat, and similar validated equations. We cite the source on each tool page.
-
Privacy by design
Your numbers are processed entirely in your browser. We never upload, store, sell, or share the health data you enter. No account is required to use any tool.
-
Free and accessible
No paywalls, no subscriptions, no signup. Every tool supports both metric and imperial units so it works for people in the US, UK, Canada, Australia and beyond.
-
Clear and honest
We explain what each result means in plain English, show the formula behind it, and are upfront that our tools are for education and wellness — never a medical diagnosis.
From research to result, in three steps
- 1
We start with the evidence
Each tool implements a published, peer-reviewed formula. We document the equation and link the original research so you can check our work.
- 2
You enter your numbers privately
Calculations run in your browser using JavaScript. The values you type never travel to a server — there's nothing for us to store or leak.
- 3
You get a clear, useful answer
We translate the math into plain-English guidance, with context on what your result means and what to consider next.
A note on medical advice. HealthyLifeStyles provides general educational and wellness information only. Our tools are not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your health. Read our full medical disclaimer.
How we create and review our content
Every calculator and article is written by our content team, built on a published, peer-reviewed formula, and checked against authoritative sources such as the WHO, CDC, American Heart Association, and primary research. We cite those sources on each tool page so you can verify our work, and we revisit content regularly to keep it current.
Our health content is reviewed for accuracy by qualified professionals. Reviews are for general education only — they are not a substitute for personal medical advice.
Have a question or an idea?
We'd love to hear which tools would help you most.