BMI Calculator API

Overview

To use BMI Calculator, you need an API key. You can get one by creating a free account and visiting your dashboard.

GET Endpoint

https://api.apiverve.com/v1/bmicalculator

Example

How to call the BMI Calculator API in different programming languages.

curl -X GET \
  "https://api.apiverve.com/v1/bmicalculator?weight=180&height=70&unit=imperial&age=30&gender=male&activityLevel=moderate" \
  -H "X-API-Key: your_api_key_here"

const response = await fetch('https://api.apiverve.com/v1/bmicalculator?weight=180&height=70&unit=imperial&age=30&gender=male&activityLevel=moderate', {
  method: 'GET',
  headers: {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
  }
});

const data = await response.json();
console.log(data);

import requests

headers = {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
}

response = requests.get('https://api.apiverve.com/v1/bmicalculator?weight=180&height=70&unit=imperial&age=30&gender=male&activityLevel=moderate', headers=headers)

data = response.json()
print(data)

package main

import (
    "fmt"
    "io"
    "net/http"

)

func main() {
    req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/bmicalculator?weight=180&height=70&unit=imperial&age=30&gender=male&activityLevel=moderate", nil)

    req.Header.Set("X-API-Key", "your_api_key_here")
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    body, _ := io.ReadAll(resp.Body)
    fmt.Println(string(body))
}

{
  "status": "ok",
  "error": null,
  "data": {
    "height": "170 cm",
    "weight": "70 kg",
    "bmi": 24.221453287197235,
    "risk": "Low risk",
    "summary": "This weight is normal and you are healthy.",
    "recommendation": "A BMI between 18.5 and 24.9 falls within the 'normal' weight range according to the World Health Organization. This range is associated with the lowest health risk for conditions such as heart disease, diabetes, and certain cancers. However, it's important to note that BMI is not a perfect measure as it does not account for muscle mass, bone density, overall body composition, and racial and sex differences. Therefore, while it's a useful starting point, it should not be the only measure of one's health."
  }
}

Authentication

The BMI Calculator API requires authentication via API key. Include your API key in the request header:

X-API-Key: your_api_key_here

Learn more about authentication →

Interactive API Playground

Test the BMI Calculator API directly in your browser with live requests and responses.

Parameters

The following parameters are available for the BMI Calculator API:

Response

The BMI Calculator API returns responses in JSON, XML, YAML, and CSV formats. The JSON response is shown in the Example section above; alternative formats below.

Other Response Formats

<?xml version="1.0" encoding="UTF-8"?>
<response>
  <status>ok</status>
  <error xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
  <data>
    <height>170 cm</height>
    <weight>70 kg</weight>
    <bmi>24.221453287197235</bmi>
    <risk>Low risk</risk>
    <summary>This weight is normal and you are healthy.</summary>
    <recommendation>A BMI between 18.5 and 24.9 falls within the &apos;normal&apos; weight range according to the World Health Organization. This range is associated with the lowest health risk for conditions such as heart disease, diabetes, and certain cancers. However, it&apos;s important to note that BMI is not a perfect measure as it does not account for muscle mass, bone density, overall body composition, and racial and sex differences. Therefore, while it&apos;s a useful starting point, it should not be the only measure of one&apos;s health.</recommendation>
  </data>
</response>

status: ok
error: null
data:
  height: 170 cm
  weight: 70 kg
  bmi: 24.221453287197235
  risk: Low risk
  summary: This weight is normal and you are healthy.
  recommendation: >-
    A BMI between 18.5 and 24.9 falls within the 'normal' weight range according
    to the World Health Organization. This range is associated with the lowest
    health risk for conditions such as heart disease, diabetes, and certain
    cancers. However, it's important to note that BMI is not a perfect measure
    as it does not account for muscle mass, bone density, overall body
    composition, and racial and sex differences. Therefore, while it's a useful
    starting point, it should not be the only measure of one's health.

Response Structure

All API responses follow a consistent structure with the following fields:

Learn more about response formats →

Response Data Fields

When the request is successful, the data object contains the following fields:

Headers

Only X-API-Key is required. Optional headers include Accept for response format negotiation (JSON, XML, or YAML), User-Agent, and X-Request-ID for request tracing. See all request headers →

GraphQL AccessALPHA

Access BMI Calculator through GraphQL to combine it with other API calls in a single request. Query only the bmi calculator data you need with precise field selection, and orchestrate complex data fetching workflows.

Credit Cost: Each API called in your GraphQL query consumes its standard credit cost.

POST https://api.apiverve.com/v1/graphql

query {
  bmicalculator(
    input: {
      weight: 180
      height: 70
      unit: "imperial"
      age: 30
      gender: "male"
      activityLevel: "moderate"
    }
  ) {
    height
    weight
    bmi
    risk
    summary
    recommendation
  }
}

Note: Authentication is handled via the x-api-key header in your GraphQL request, not as a query parameter.

CORS Support

The BMI Calculator API accepts cross-origin requests from any origin, so it can be called directly from browser-based applications without a proxy. See CORS support →

Rate Limiting

BMI Calculator requests are throttled per minute on the Free plan and unthrottled on paid plans. Exceeding the limit returns 429 Too Many Requests; rate-limit usage is reported in the X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset response headers. See per-plan limits and best practices →

Error Codes

The BMI Calculator API uses standard HTTP status codes — 200 on success, 400 for invalid parameters, 401 for missing or invalid keys, 403 for insufficient credits, 429 for rate-limit exhaustion, and 500/503 for server-side issues. Each error response includes an X-Request-ID header you can quote when contacting support. See full error handling guide →

SDKs for BMI Calculator

Official BMI Calculator packages on npm, PyPI, NuGet, and JitPack — plus a Postman collection and an OpenAPI spec. See the SDK guide →

JitPack

No-Code Integrations

BMI Calculator works with Zapier, Make, Pipedream, n8n, and Power Automate using the same API key. See setup guides →

Zapier

Make

Pipedream

n8n

Power Automate

Frequently Asked Questions

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1 credit per call