Body Composition APIs¶

Welcome to the Body Composition suite of Health Fitness API – your one-stop destination for accurate, science-backed calculations that empower fitness, wellness, and healthcare apps.

Our endpoints cover BMI, body fat analysis, muscle mass estimation, body surface area, recomposition forecasting, and advanced metrics like FFMI, BAI, ABSI, and AJBW.

Whether you're building a personal fitness tracker, a nutrition planner, a SaaS health platform, or an enterprise-grade wellness tool, these APIs provide low-latency, real-time calculations, and support 8 languages (en, es, de, fr, pt, ja, hi, ar).

Key Features¶

Comprehensive Metrics: BMI, Body Fat %, FFMI, Lean Body Mass, Ponderal Index, BRI, BAI, ABSI, IBW, AJBW, BSA, and AVA.
Multiple Formula Support: Imperial & Metric units for global usability.
Forecasting & Analytics: Predict body recomposition trends and energy-adjusted assessments.
Enterprise-Grade Performance: Optimized for high concurrency, low latency, and real-time responses.
Multi-Language: Localize your results for global audiences instantly.
Secure & Authenticated: Every request uses API key-based authentication.

Available Endpoints¶

Below is the full list of Body Composition endpoints:

Endpoint	Description
BMI API	Calculate Body Mass Index (BMI) from weight and height.
BMI (Imperial) API	BMI calculation using Imperial units (lbs/inches).
Body Fat API	Estimate body fat percentage from age, weight, height, and gender.
Body Fat (Navy) API	Navy method-based body fat estimation.
Body Fat (Army) API	Army formula for body fat assessment.
Body Fat (Imperial) API	Body fat % using Imperial units.
FFMI API	Fat-Free Mass Index for muscle mass evaluation.
Lean Body Mass API	Calculate lean body mass for fitness and nutrition planning.
Ponderal Index API	Assess body leanness relative to height.
BRI Calculator API	Body Roundness Index for fat distribution analysis.
BAI API	Body Adiposity Index for advanced body composition tracking.
ABSI API	A Body Shape Index for cardio and mortality risk insights.
IBW API	Ideal Body Weight estimation based on multiple formulas.
AJBW API	Adjusted Ideal Body Weight metric for clinical guidance.
AJBW (Imperial) API	Imperial units version of AJBW.
BSA Calculator API	Body Surface Area calculation for medical applications.
Geriatric BMI API	BMI assessment tailored for geriatric populations.
Body Recomposition Forecast API	Predict changes in body composition over time.
AVA Calculator API	Advanced Visceral Adiposity estimation for health risk management.

Why Use Health Fitness Body Composition APIs?¶

Accurate & Validated: Formulas are backed by clinical and research studies.
High Performance: Low-latency infrastructure ideal for enterprise-grade apps.
Global-Friendly: Supports 8 languages, perfect for international platforms.
Flexible: Use individually or combine multiple endpoints for comprehensive body analytics.
Enterprise Ready: Works with private deployments, SLA-backed uptime, and high concurrency.

Quick Example – BMI API¶

curl -X GET "https://api.hefitapi.com/api/v1/bai?sex=female&age=35&hip=101&height=1.66&lang=en" \
  -H "X-API-Key: YOUR_API_KEY"

Response Example¶

Info

The response example below is for demonstration purposes only. Make a live request to this endpoint to receive the full, real-time, and potentially richer JSON structure.

{
  "height": "1.8 m",
  "weight": "82.0 kg",
  "bmi": "25.9 kg/m2",
  "weight_status": "Overweight",
  "bmi_value": 25.88,
  "weight_status_band": "overweight",
  "weight_status_label": "Overweight",
  "risk_signal": "Weight trend may increase long-term cardiometabolic risk.",
  "action_plan": ["Tighten calorie quality", "Increase weekly activity volume"],
  "monitoring_plan": "Reassess in 4-6 weeks.",
  "language": "en",
  "_enterprise": {
    "client": "Acme Health",
    "plan": "pro",
    "request_id": "2d8f0fe12d5ab429",
    "quota": 120,
    "usage_tracking": true
  },
  "_api_metadata_": {
    "api_name": "Health Fitness API by Dakidarts®",
    "endpoint_name": "bmi",
    "response_language": "en"
  }
}

Next Steps¶

Explore each endpoint for detailed parameters, request examples, and responses.
Combine Body Composition endpoints with Nutrition & Diet APIs for holistic health insights.
Integrate with Fitness & Training endpoints for predictive workout planning.
Monitor usage via HefitAPI Dashboard for multi-user admin, developer, and finance roles.

Power your health, fitness, and wellness apps with real-time body composition insights – only with Health Fitness API.