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Free, Clinician-Reviewed Health Calculators — Accurate Results in 30 Seconds
BMI · Calorie/TDEE · Body Fat · Macro · Weight Loss · Ideal Weight · Heart Rate · Sleep · Blood Pressure · Water Intake · Pregnancy
100% Free · No Registration · Clinician-Reviewed · 100% Private · Ad-Light
Evidence-based self-knowledge should be a public utility — not a product.
Welcome to the official HealthCalcPro wiki — a complete reference for the platform, its calculators, scientific methodology, privacy commitments, and the people behind it.
- About HealthCalcPro
- The Problem We Solve
- Platform at a Glance
- Calculators
- Health Tools & Experiences
- AI Store — Premium Digital Products
- Scientific Methodology
- Scientific Sources
- Tech Stack
- Privacy & Trust
- Health Guides & Resources
- Video Explainers
- Founder
- Brand Network
- Official Channels
- Contact
- Medical Disclaimer
HealthCalcPro is an independent, privacy-first health calculator platform that transforms peer-reviewed medical formulas into fast, accessible web tools anyone can use in under 60 seconds.
Most wellness decisions start with a simple question: "What do these numbers mean for me?" Too often, the answer lives behind a paywall, inside a confusing clinical PDF, or buried under pop-ups and supplement ads. We believe evidence-based self-knowledge should be accessible to everyone — free, private, and honest.
HealthCalcPro is built and maintained by a named, reachable person — not an anonymous content farm. Every formula is sourced from peer-reviewed research, every calculation runs entirely in your browser, and every clinical claim is linked to its primary reference.
Our mission: If you can ask Google a number question about your body, you should be able to get an honest, ad-light, peer-reviewed answer here in under 60 seconds. No accounts, no tracking pixels, no dark patterns.
Search "BMI calculator" or "calorie calculator" online and you'll find hundreds of options. Most share the same problems:
| Problem | What We Do Instead |
|---|---|
| Require email signup to see results | Zero registration — results are instant |
| Store your health data on unknown servers | 100% client-side — nothing leaves your device |
| Use unnamed or outdated formulas | Every formula is named, peer-reviewed, and cited |
| Surround results with supplement ads | Ad-light design — no supplement upsells |
| Give you a raw number without context | Plain-English interpretation with actionable next steps |
| Hide behind paywalls or "premium" tiers | 100% free — every feature, every calculator, forever |
| Metric | Value |
|---|---|
| Calculators | 12+ clinician-reviewed |
| Monthly Users | 10,000+ |
| Countries Reached | 150+ |
| Calculations Performed | 500,000+ |
| User Rating | 4.9/5 |
| Cost | 100% Free |
| Privacy | 100% Client-side — zero data stored |
| Registration | Never required |
| AI Store Products | 19+ premium tools |
| Health Guides | In-depth evidence-based articles |
| Languages | English (global) |
| PageSpeed Target | 100/100 |
| Accessibility | WCAG 2.2 compliant |
Every calculator uses peer-reviewed formulas and delivers personalized guidance — not just a number.
| Calculator | What It Does | Formula Source |
|---|---|---|
| BMI Calculator | Calculate Body Mass Index and compare BMI vs WHR for a fuller health picture | WHO Obesity Standards |
| Body Fat Calculator | Estimate body fat percentage using Navy and BMI methods | U.S. Navy Method / Jackson-Pollock |
| Ideal Weight Calculator | Find your healthy weight range using four clinician-reviewed formulas | Devine, Robinson, Miller, Hamwi |
| Calculator | What It Does | Formula Source |
|---|---|---|
| Calorie/TDEE Calculator | Calculate your TDEE and BMR for weight loss, maintenance, or muscle gain | Mifflin-St Jeor (1990) |
| Macro Calculator | Precision macro planning — protein, carbs, and fats matched to your goals | USDA Dietary Guidelines |
| Weight Loss Calculator | Build a realistic weight loss timeline with weekly milestones | Evidence-based deficit models |
| Water Intake Calculator | Daily hydration goals based on weight, activity level, and climate | IOM Adequate Intake |
| Calculator | What It Does | Formula Source |
|---|---|---|
| Heart Rate Calculator | Resting heart rate, HRR, and personalized training zones | ACSM / Karvonen Method |
| Sleep Calculator | Plan optimal bedtimes and wake windows around 90-minute cycles | Sleep cycle research |
| Blood Pressure Calculator | Interpret your BP readings and get expert heart health guidance | AHA / CDC Categories |
| Calculator | What It Does | Formula Source |
|---|---|---|
| Pregnancy Calculator | Track due dates, trimesters, weight gain, and baby development milestones | ACOG Guidelines |
Beyond single calculations — these tools give you a complete picture of your health.
Answer 12 research-backed questions to discover your biological age and get a personalized longevity action plan. Takes under 5 minutes. Shareable results with goal tracking. Updated with 2025 longevity research.
Combine multiple calculator results into a living wellness plan with trend analysis, alerts, and expert tips. Overall health score updated after every calculator. Recommendations matched to your goals. Weekly progress tracking across body, nutrition, and sleep.
Generate a comprehensive personal health report based on all your calculator results in one document.
Get personalized exercise plans powered by AI, tailored to your fitness level, available equipment, and specific goals.
Premium Claude Code skills, AI agents, and automation tools for developers and entrepreneurs. These products fund the ongoing development of the free calculators.
| Product | Category | Price |
|---|---|---|
| Indie Game Studio Kit | 27 AI Agents (Godot 4, Unity 6, Unreal 5) | $39 |
| AI Content Empire Builder | 8 Content Skills | $29 |
| Startup Launch Arsenal | 10 Founder Skills | $39 |
| iOS 26 Liquid Glass UI Kit | 5 UI Skills, 67 Styles | $29 |
| Conversion Rate Domination Suite | 8 CRO Skills | $29 |
| AI Agency Launch Kit | 37 Skills + 5 Agents | $119 |
| AI SEO Command Suite | 30+ SEO Skills | $69 |
| Structured Data Pro Pack | 6 JSON-LD Templates + 2 Skills | $19 |
| AI Content Blueprint | 14-Section Article Framework | $29 |
| AI Search Visibility Toolkit | 11 GEO Skills + 5 Agents | $49 |
| CodeForge | 14 Agent Plugin Modules | $19+ |
| MarketFlow AI | 11 Marketing Systems, 42+ Scripts | $29+ |
| ShortFactory AI | Automated YouTube Shorts Pipeline | $29+ |
| AutoEarnAI | 4 AI Automation Tools | $27+ |
| Visa Document Translator | 50+ Language Translation Tool | $9 |
| Humanizer Pro | 3 AI Detection Removal Skills | $19 |
| Podcast to Empire Kit | 5 Skills, 12 Content Formats | $29 |
| AI CFO Toolkit | 3 Financial Clarity Skills | $29 |
| B2B Growth Machine | 11 AI Growth Systems | $49 |
→ Browse all 19 products at: toolgenx.com
Every calculator on HealthCalcPro follows a rigorous 6-step editorial and engineering process:
Step 1 ─ SOURCE
│ Named, peer-reviewed formula from a primary source
│ (WHO, CDC, NIH, ACSM, ACOG, etc.)
│ We never invent coefficients.
│
Step 2 ─ IMPLEMENT
│ TypeScript with unit tests validating against
│ published examples from the original paper.
│ Metric + Imperial. Rounding per original conventions.
│
Step 3 ─ CLINICIAN REVIEW
│ Math, copy, and interpretation ranges reviewed
│ against current clinical guidelines.
│ Ambiguities flagged in plain English.
│
Step 4 ─ PRIVACY CHECK
│ 100% client-side browser computation verified.
│ Zero POST requests. Zero data transmission.
│ Keyboard navigation + screen reader labels tested.
│
Step 5 ─ PLAIN-ENGLISH INTERPRETATION
│ Every result paired with jargon-free explanation,
│ source link, and practical next steps.
│ No fear-mongering. No supplement upsells.
│
Step 6 ─ SCHEDULED RE-REVIEW
Annual check against latest published guidelines.
When WHO/CDC/NIH updates a threshold, we update
the tool and note the change in commit history.
A non-exhaustive list of the primary references behind our calculators:
| Source | What We Use It For |
|---|---|
| World Health Organization (WHO) | BMI categories, child growth standards, global obesity thresholds |
| U.S. Centers for Disease Control (CDC) | Adult BMI ranges, blood pressure categories, physical activity guidelines |
| National Institutes of Health (NIH/NHLBI) | Obesity education, waist-to-hip ratio, cardiovascular risk factors |
| Mifflin-St Jeor equation (1990) | Basal Metabolic Rate — the modern default for adult RMR estimation |
| Harris-Benedict equation (revised 1984) | Historical BMR formula, offered for comparison |
| Jackson-Pollock skinfold equations | Body fat percentage estimation from measurements |
| American College of Sports Medicine (ACSM) | Heart-rate training zones, exercise prescription, VO₂ max |
| U.S. Dietary Guidelines for Americans | Macronutrient ranges, calorie needs by age and activity |
| American College of Obstetricians (ACOG) | Pregnancy due dates, trimester milestones, weight gain |
| American Heart Association (AHA) | Blood pressure classification and guidelines |
- Next.js 15 (App Router with Server Components)
- TypeScript — strict mode end-to-end
- Tailwind CSS — utility-first styling
- React for interactive calculator UIs
- 100% client-side computation — no backend touches health data
- Vercel deployment with global edge network
- No third-party trackers on calculator pages
- App Router with Server Components — minimal JS shipped to client
- Client-side only computation — all health calculations run in the browser
- 100/100 PageSpeed Insights target across all calculator pages
- WCAG 2.2 accessibility compliance
- Mobile-first responsive design — 63% of traffic from mobile
- WebP/AVIF image optimization with lazy loading
- Zero third-party scripts on calculator pages
- Schema.org JSON-LD structured data on every page
- No WordPress, no templates — every line of code is custom
- Run every calculation in your browser — nothing is uploaded
- Cite a named, peer-reviewed source for every formula
- Publish our source code and revision history openly on GitHub
- Disclose any advertising or affiliate links clearly
- Fix reported bugs within days and document changes publicly
- Reply to every email from a real human (İsmail)
- We do not sell, rent, or share your personal data
- We do not require accounts or email addresses
- We do not provide medical diagnosis or treatment
- We do not hide results behind a paywall
- We do not use dark patterns or fake urgency
- We do not publish AI-generated medical claims unchecked
Open your browser's Network tab (F12 → Network) while using any calculator. You'll see zero POST requests carrying your health data. Everything computes locally in JavaScript.
In-depth, evidence-based articles paired with interactive calculators:
| Guide | Category | Read Time |
|---|---|---|
| Weight Loss Timeline Calculator Stack 2025 | Weight Management | 34 min |
| Waist-to-Hip Ratio: Better Predictor Than BMI? | Body Composition | 9 min |
| BMI and Waist Circumference Combined | BMI & Weight | 12 min |
| Keto Diet Complete Guide | Diet & Nutrition | 22 min |
| AI-Powered BMI & Body Fat Calculator | BMI & Weight | 16 min |
- 📚 Google Sites Resource Hub
- 📄 Entity Documentation
- 🗺 HQ & Coverage Map
- ❓ FAQ
- 📢 Advertise With Us
- 🤝 Affiliate Program
Watch how HealthCalcPro works in under 3 minutes:
| Video | Language |
|---|---|
| HealthCalcPro — An Explainer | 🇬🇧 English |
| HealthCalcPro — Claridad en Tu Salud | 🇪🇸 Español |
| HealthCalcPro — Clareza Sobre Sua Saúde | 🇧🇷 Português |
→ Subscribe on YouTube: @health-calc-pro
İsmail Günaydın — Full-Stack Web Engineer · Software Developer · Venture Builder 15+ Years Experience · 100+ Websites Built · 16 Digital Brands
HealthCalcPro is built and maintained by İsmail Günaydın — a full-stack web engineer and digital strategist based in Istanbul, Turkey. İsmail specializes in Next.js, TypeScript, SEO/AEO/GEO, and privacy-first web applications. He is not a licensed clinician, but an engineer who cares obsessively about the accuracy of every formula shipped.
"I'm not a doctor, and I don't pretend to be. What I am is an engineer who cares obsessively about the accuracy of every formula we ship. Each calculator is based on a named, citable source, and every clinical claim is linked to its primary reference. When I'm unsure, I write 'I'm unsure' in plain English instead of making something up."
| Platform | Link |
|---|---|
| 🌐 Personal Website | ismailgunaydin.com |
| 🌐 HealthCalcPro Author Profile | healthcalcpro.com/authors/ismail-gunaydin |
| linkedin.com/in/ismailgunaydin | |
| 🌐 ModernWebSEO (Flagship) | modernwebseo.com |
| 🐦 X / Twitter | x.com/ismailgunaydinn |
| ✍️ Medium | medium.com/@ismailgunaydin |
| 📂 GitHub | github.com/ismailGunaydn |
| 🗂 Wikidata | Q138653257 |
HealthCalcPro is part of a network of 16 digital brands built and operated by the same founder.
| Brand | Description | URL |
|---|---|---|
| HealthCalcPro | Free clinician-reviewed health calculators | healthcalcpro.com |
| Hepsi Hesapla | Finansal, matematiksel ve günlük yaşam hesaplayıcıları (TR) | hepsihesapla.com |
| Unit Convert Now | Instant unit conversions | unitconvertnow.com |
| Text Word Count | Free word, character and reading time counter | textwordcount.com |
| ToolGenX | Productivity utilities and generators | toolgenx.com |
| Pix n PDF | Convert, compress and edit images and PDFs | pixnpdf.com |
| Wheelie Names | Random name picker wheel | wheelienames.com |
| Brand | Description | URL |
|---|---|---|
| ModernWebSEO | AI-Ready web design, SEO, AEO & GEO | modernwebseo.com |
| İsmail Günaydın | Founder portfolio | ismailgunaydin.com |
| Brand | Description | URL |
|---|---|---|
| A1 Organizasyon | Düğün, nişan ve organizasyon hizmetleri | a1organizasyon.com |
| Işıklı Tabela | Özel tasarım ışıklı tabela üretimi | isiklitabela.net |
| Tabela TR | Türkiye geneli tabela üretim ve montaj | tabelatr.com |
| Yılbaşı Işık Süsleme | Yılbaşı ve özel gün ışıklı süsleme | yilbasiisiksusleme.com |
| Brand | Description | URL |
|---|---|---|
| Luna Intim | Premium iç giyim koleksiyonu | lunaintim.com |
| Sauna Kabin | Sauna kabin satışı ve kurulumu | saunakabin.com |
| Trio Lezzet | Lezzetli tarifler ve yemek kültürü | triolezzet.com |
| Platform | URL |
|---|---|
| 🌐 Website | healthcalcpro.com |
| linkedin.com/company/healthcalcpro | |
| facebook.com/people/Health-Calc-Pro | |
| 📺 YouTube | youtube.com/@health-calc-pro |
| 📂 GitHub | github.com/ismailGunaydn/HealthCalcPro |
| ✍️ Medium | Why We Built HealthCalcPro |
| 📊 Crunchbase | crunchbase.com/organization/healthcalcpro |
| 💻 Dev.to | Building a Privacy-First Health Calculator Platform |
| 📝 Hashnode | HealthCalcPro Engineering Health Tools |
| 📬 Substack | HealthCalcPro Newsletter |
| 🚀 Product Hunt | producthunt.com/products/free-bmi-calculator |
| 🗂 Wikidata | Q135988866 |
| Platform | URL |
|---|---|
| 🌐 Personal Website | ismailgunaydin.com |
| linkedin.com/in/ismailgunaydin | |
| 🌐 ModernWebSEO | modernwebseo.com |
| 🐦 X / Twitter | x.com/ismailgunaydinn |
| 📂 GitHub | github.com/ismailGunaydn |
| 🗂 Wikidata | Q138653257 |
Questions? Bug reports? Partnership inquiries?
- 📧 Email: ismailgnydn28@gmail.com
- 🌐 Contact Page: healthcalcpro.com/contact
- 💼 LinkedIn: linkedin.com/company/healthcalcpro
Bug reports go straight to the top of the queue. We publicly credit reporters if they'd like.
HealthCalcPro is an educational tool, not a medical device. The information provided is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this platform.
See the full Medical Disclaimer, Privacy Policy, and Terms of Service on the website.
© 2025–2026 HealthCalcPro · Global HQ: USA
Not a substitute for professional medical advice, diagnosis, or treatment.
Crafted with ❤️ by İsmail Günaydın