Lean body mass (Boer) API

Estimate lean body mass and fat mass from weight, height & sex via the Boer (1984) formula (male 0.407·kg+0.267·cm−19.2; female 0.252·kg+0.473·cm−48.3). Answers 'what's my lean body mass', 'fat-free mass', 'lean mass for 80kg/180cm male', 'Boer LBM'.

Price$0.01per request

MethodPOST

Route/v1/health/lean-body-mass

StatusLive

MIME typeapplication/json

Rate limit120/minute

CacheNo cache

healthlean-body-massboerfat-free-masscompositionfitnesslbmcalculator

API URLhttps://x402.hexl.dev/v1/health/lean-body-mass

Integration docs

Example request

{
  "weightKg": 80,
  "heightCm": 180,
  "sex": "male"
}

Example response

{
  "leanBodyMassKg": 61.4,
  "fatMassKg": 18.6,
  "method": "Boer (1984)",
  "formula": "0.407*kg + 0.267*cm - 19.2",
  "sex": "male",
  "inputs": {
    "weightKg": 80,
    "heightCm": 180
  }
}

Input schema

{
  "type": "object",
  "required": [
    "weightKg",
    "heightCm",
    "sex"
  ],
  "properties": {
    "weightKg": {
      "type": "number",
      "examples": [
        80
      ]
    },
    "heightCm": {
      "type": "number",
      "examples": [
        180
      ]
    },
    "sex": {
      "type": "string",
      "enum": [
        "male",
        "female"
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}