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Katch McArdle Calculator API

Return LBM and BMR outputs with metabolic-band interpretation and practical training focus guidance.

Endpoint

  • GET /api/v1/katch-mcardle-calculator
  • POST /api/v1/katch-mcardle-calculator/post

Parameters

Name Type Required In Description
sex string Yes Query/Body male or female.
height number Yes Query/Body Height in cm (metric) or inches (imperial).
weight number Yes Query/Body Weight in kg (metric) or lb (imperial).
unit string No Query/Body metric (default) or imperial.
lang string No Query Response language (en,es,de,fr,pt,ja,hi,ar).

Why Use This Endpoint

  • Estimate basal needs from lean-mass-informed logic.
  • Support intake and macro engines with consistent BMR baseline.
  • Attach coaching actions to low/moderate/high metabolic bands.

Get Started

Request Example

curl -X GET "https://api.hefitapi.com/api/v1/katch-mcardle-calculator?sex=male&height=179&weight=82&unit=metric&lang=en" \
  -H "X-API-Key: YOUR_API_KEY"

curl -X POST "https://api.hefitapi.com/api/v1/katch-mcardle-calculator/post?lang=en" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_API_KEY" \
  -d '{"sex":"female","height":66,"weight":148,"unit":"imperial"}'

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.

{
  "sex": "male",
  "height_cm": 179.0,
  "weight_kg": 82.0,
  "unit": "metric",
  "lbm_kg": 76.46,
  "lbm_ratio_percent": 93.24,
  "bmr_kcal_per_day": 2021.54,
  "metabolic_band": "high",
  "metabolic_band_label": "High",
  "priority_focus": ["Prioritize performance fueling"],
  "training_guidance": ["Maintain progressive overload with adequate recovery"],
  "monitoring_plan": "Review weight and performance trend biweekly.",
  "_enterprise": {
    "client": "Acme Health",
    "plan": "pro",
    "request_id": "ab4e5f06c2c65a6e",
    "quota": 120,
    "usage_tracking": true
  },
  "_api_metadata_": {
    "endpoint_name": "katch_mcardle_calculator",
    "response_language": "en"
  }
}

Product Positioning

A strong building block for body-composition apps, nutrition planning tools, and enterprise wellness products.

Note

sex, height, and weight are required in both request methods.