BMI Calculator: API and MCP

BMI Calculator over REST and MCP: input fields, limits, outputs, one example request and its real answer. Free, no sign-up.

Id: health.bmi
Version: 1.0.0
Access: Free
Tool page: BMI Calculator
Schema: GET /api/v1/tools/health.bmi

Input

Field	Type	Constraints	Default	Description
`weight` (required)	number	≥ 20, ≤ 350		Weight (kg)
`height` (required)	number	≥ 100, ≤ 250		Height (cm)

Output

Field	Type	Description
`bmi`	number	Body mass index (kg/m²)
`underweight`	boolean	Underweight: BMI below 18.5.
`normal`	boolean	Normal weight: BMI 18.5–24.9.
`overweight`	boolean	Overweight: BMI 25.0–29.9.
`obese`	boolean	Obesity: BMI 30.0 or more.
`healthyMin`	number	Healthy weight range: from (kg)
`healthyMax`	number	Healthy weight range: to (kg)

Example request

{
  "input": {
    "weight": 68,
    "height": 170
  },
  "locale": "en"
}

Example answer

{
  "output": {
    "bmi": 23.5,
    "underweight": false,
    "normal": true,
    "overweight": false,
    "obese": false,
    "healthyMin": 53.5,
    "healthyMax": 72
  },
  "steps": [
    {
      "id": "bmi",
      "formula": "BMI = weight / height²",
      "substitution": "BMI = 68 / 1.7²",
      "value": 23.5,
      "unit": "kg/m²"
    },
    {
      "id": "healthyMin",
      "formula": "healthy weight from = 18.5 × height²",
      "substitution": "healthy weight from = 18.5 × 1.7²",
      "value": 53.5,
      "unit": "kg"
    },
    {
      "id": "healthyMax",
      "formula": "healthy weight to = 24.9 × height²",
      "substitution": "healthy weight to = 24.9 × 1.7²",
      "value": 72,
      "unit": "kg"
    }
  ],
  "meta": {
    "toolVersion": "1.0.0",
    "locale": "en"
  },
  "citation": {
    "url": "https://hesaplayici.com/en/health/bmi-calculator",
    "title": "BMI Calculator"
  }
}