# Health Calculator

> Use this skill when the user provides their height, weight, age, and gender and asks about their BMI, ideal weight, daily calorie needs (TDEE), or waist-to-height ratio. Also triggered by questions like "am I overweight?", "how many calories should I eat?", or "what is my healthy weight range?". Applies to advisor_agent and clinic_agent.

- Skill: `wananing/health-calculator` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add wananing/health-calculator`
- Raw SKILL.md: https://api.skillmd.com/api/skills/wananing/health-calculator/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: wananing (https://skillmd.com/u/wananing)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/wananing/health-calculator

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# Health Calculator Skill

Computes body-metric indicators from user-provided measurements using validated
clinical formulas. All calculations are statistical estimates and must be
accompanied by the embedded disclaimer.

## Capabilities

| Metric | Formula | Output |
|--------|---------|--------|
| BMI | weight_kg / height_m² | Value + WHO/Asian category |
| Ideal weight | Devine formula | kg + difference from current |
| BMR | Mifflin-St Jeor | kcal/day at rest |
| TDEE | BMR × activity factor | kcal/day adjusted for lifestyle |
| Waist-height ratio | waist_cm / height_cm | ratio + cardiovascular risk tier |

## Required Inputs

- `height_cm` — height in centimetres (50–300)
- `weight_kg` — weight in kilograms (1–500)
- `age` — age in years
- `gender` — `"male"` or `"female"`

## Optional Inputs

- `activity_level` — one of `sedentary | light | moderate | active | very_active`
- `waist_cm` — waist circumference for WHR cardiovascular risk (adds `whr_risk` field)

## Output Notes

- BMI categories use **Asian cutpoints** (overweight ≥24.0, obese ≥28.0)
- Always display the `disclaimer` field alongside results
- If `weight_diff_kg` is positive the user should lose weight; negative means gain