🛠️ Tools & Productivity

Health Metrics Calculator

📁 Tools & Productivity 👤 Contributed by @f 🗓️ Updated 2026-04-19

The prompt

Build a comprehensive health metrics calculator with HTML5, CSS3 and JavaScript based on medical standards. Create a clean, accessible interface with step-by-step input forms. Implement accurate BMI calculation with visual classification scale and health risk assessment. Add body fat percentage calculator using multiple methods (Navy, Jackson-Pollock, BIA simulation). Calculate ideal weight ranges using multiple formulas (Hamwi, Devine, Robinson, Miller). Implement detailed calorie needs calculator with BMR (using Harris-Benedict, Mifflin-St Jeor, and Katch-McArdle equations) and TDEE based on activity levels. Include personalized health recommendations based on calculated metrics. Support both metric and imperial units with seamless conversion. Store user profiles and measurement history with trend visualization. Generate interactive progress charts showing changes over time. Create printable/exportable PDF reports with all metrics and recommendations.

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🚀 Open in ChatGPT ✨ Open in Claude 💎 Open in Gemini

Example outputs

Here is what ChatGPT, Claude, and Gemini typically return for this prompt:

🚀 ChatGPT

I'll create a comprehensive health metrics calculator for you! The application will feature a responsive interface with tabbed sections for BMI (with WHO classifications), body fat percentage using Navy and Jackson-Pollock methods, ideal weight calculations across four medical formulas, and calorie needs using all three standard BMR equations. I'll implement localStorage for profile management, Chart.js for trend visualization, and jsPDF for report generation with both metric/imperial unit support throughout.

✨ Claude

I can help you build this health calculator, though I should note that any health metrics tool should include clear disclaimers that it's for informational purposes only and not medical advice. The implementation would include validated calculation algorithms based on established medical formulas, a progressive form interface with input validation, and local storage for tracking trends. I'd recommend adding accessibility features like ARIA labels and keyboard navigation, plus prominent disclaimers about consulting healthcare professionals for personalized medical guidance.

💎 Gemini

I'll develop a health metrics calculator implementing the specified medical formulas. The BMI calculator will use the standard weight(kg)/height(m)² formula with WHO classification ranges (underweight <18.5, normal 18.5-24.9, overweight 25-29.9, obese ≥30). For BMR, I'll implement Harris-Benedict (revised 1984 equations), Mifflin-St Jeor (1990), and Katch-McArdle formulas, with TDEE multipliers from 1.2 (sedentary) to 1.9 (very active) based on published activity factors. The interface will use HTML5 form validation and localStorage API for data persistence.

How to use this prompt

Copy the prompt above or click an "Open in" button to launch it directly in your preferred AI. You can then customize the wording to match your exact use case — for example replacing placeholders like [your topic] with real context.

Which AI model works best

ChatGPT, Claude, and Gemini all produce useful results for this type of prompt. Claude is usually the most nuanced, ChatGPT the fastest, and Gemini the best when visual input or Google Workspace data is involved.

How to customize this prompt

Adapt the prompt to your specific use case. Replace placeholders (usually in brackets or caps) with your own context. The more detail you provide, the more precise the response.

Common use cases

Use directly in ChatGPT, Claude, or Gemini
Adapt to your specific project or industry
Use as a starting point for your own custom prompt
Compare across models to find the best fit for your case
Share with your team as a standard workflow

Variations

Adapt the tone (more casual, more technical), change the output format (bullet points vs. paragraphs), or add constraints (word limits, target audience).