About Healthy Calculator Hub
Healthy Calculator Hub is 33 free health and fitness calculators and 23 guides, built and maintained by one person — Javeed Shaik, a web developer in Kurnool, Andhra Pradesh, India. Every page shows the formula it used and cites the research behind it.
Who runs this site
Me — Javeed Shaik, and you can check I exist on LinkedIn. There is no team and no company behind this — I build the calculators, write the guides, chase down the papers, and fix the mistakes. When the site says "we", it means me, and I have stopped writing it that way.
I am not a doctor, dietitian or clinician of any kind, and I have no medical training. This site has no medical reviewer. I would rather tell you that plainly than let a confident tone imply otherwise. You can read more about who I am, including what I do when the evidence is genuinely unclear.
What the site does
It answers the everyday arithmetic questions people search for: how many calories you burn, what your macros work out to, how a body fat reading should be interpreted, what a running pace converts to. Each calculator loads fast, works on any device, and shows both the result and a plain-language explanation of what it actually means.
How the calculators are built
Every tool implements an established, published formula rather than a number I invented. The calorie and TDEE tool uses Mifflin-St Jeor; body fat uses the U.S. Navy circumference method; one-rep max averages the Epley and Brzycki formulas; BMI and ideal-weight ranges follow WHO and CDC classifications. There are over 280 citations across the site — to the CDC, WHO, NIH, NHS, the National Academies, FAO and the original research papers.
I check each formula against its original source before it goes live, and revisit tools as guidance changes. How research, fact-checking and corrections work is set out on the editorial process page. If something looks wrong, I genuinely want to know — tell me.
What this site will not do
- Invent a formula, or present a number without showing where it came from.
- Dress up an unsettled question as settled. Body fat categories have no agreed international standard, and the guides say so instead of printing a tidy table as fact.
- Repeat a figure I cannot trace to a real source, however widely it circulates.
- Claim clinical authority it does not have.
A note on medical advice
Healthy Calculator Hub provides general information and estimates for educational purposes only. It is not medical advice and is not a substitute for professional diagnosis or treatment. Always consult a qualified healthcare provider before making decisions about your health, diet or exercise — especially if you have an existing condition, are pregnant, or are starting a new programme.
Free, no sign-up, no paywall. Ad-supported. Written and maintained by Javeed Shaik — contact hello@healthycalculatorhub.com.