Estimate body fat percentage, fat mass, lean mass, BMI, and a body-composition category. Uses the U.S. Navy circumference method (waist, neck, hip) or a BMI-based estimate (Deurenberg formula). Metric (kg/cm) or imperial (lbs/in) inputs.
This page documents the HTTP endpoint POST /api/tools/body-fat-calculator/execute. See the MCP reference →
Call it over REST
POST https://api.findutils.com/api/tools/body-fat-calculator/execute · no API keys · 60 requests/min per IP
Execute — verified arguments
curl -X POST https://api.findutils.com/api/tools/body-fat-calculator/execute \
-H "Content-Type: application/json" \
-d '{
"gender": "male",
"weight": 70,
"height": 175,
"waist": 85,
"neck": 38
}'Parameter schema for this endpoint
curl https://api.findutils.com/api/tools/body-fat-calculatorInput schema
| Argument | Type | Required | Description |
|---|---|---|---|
| gender | string (male | female) | yes | Biological sex used by the formulas. |
| weight | number | yes | Body weight in kg (metric) or lbs (imperial). |
| height | number | yes | Height in cm (metric) or inches (imperial). |
| unit_system | string (metric | imperial) | no | Unit system for all measurements. Default: "metric". |
| method | string (navy | bmi) | no | "navy" = U.S. Navy circumference method (needs waist, neck, and hip for female). "bmi" = BMI-based estimate. Default: "navy". |
| waist | number | no | Waist circumference at the navel (cm or in). Required for the navy method. |
| neck | number | no | Neck circumference below the larynx (cm or in). Required for the navy method. |
| hip | number | no | Hip circumference at the widest point (cm or in). Required for the navy method when gender is female. |
| age | integer | no | Age in years. Only used by the bmi method. Default 30. Default: 30. |
Example arguments (verified)
{
"gender": "male",
"weight": 70,
"height": 175,
"waist": 85,
"neck": 38
}Also an MCP tool
Claude, Cursor, and any MCP client can call this tool as
findutils:body_fat_calculator after one connect command.
Connect once
claude mcp add findutils --transport http https://mcp.findutils.com/More Calculators tools
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