Body Fat Calculator API

Body fat percentage by the US Navy circumference method, with the ACE category and (given a weight) fat and lean mass.

POST /api/v1/tools/body-fat-calculatorMCP body_fat_calculatorCalculators

Estimate body fat percentage from height, neck, waist and hip measurements with the US Navy tape method, plus your ACE category, fat mass and lean mass.

Input

Send these as a JSON object. Unknown fields are rejected.

sex: male or female; the formula differs (women also need hip). (string, one of male, female, required)
units: metric: centimetres and kilograms. imperial: inches and pounds. (string, one of metric, imperial, default "metric")
height: Height (100 to 250 cm, or 39 to 98 in). (number, 0 to …, required)
neck: Neck circumference, just below the larynx. (number, 0 to …, required)
waist: Waist circumference: at the navel for men, at the narrowest point for women. (number, 0 to …, required)
hip: Hip circumference at the widest point. Required for female, ignored for male. (number, 0 to …)
weight: Optional body weight (kg or lb) to also get fat mass and lean mass. (number, 0 to …)

Try it in the browser JSON Schema Get an API key

curl https://pithlab.com/api/v1/tools/body-fat-calculator \n  -H "Authorization: Bearer $PITHLAB_KEY" \n  -H "Content-Type: application/json" \n  -d '{"sex":"male","units":"metric","height":180,"neck":38,"waist":85,"weight":80}'

Example response

{
  "ok": true,
  "result": {
    "bodyFatPercent": 16.2,
    "category": "Fitness",
    "categoryRange": "14–17%",
    "fatMass": 12.9,
    "leanMass": 67.1,
    "text": "Body fat 16.2%: Fitness (ACE 14–17%); fat mass 12.9 kg, lean mass 67.1 kg"
  }
}