BMI CalculatorBMI Calculator API

OnlineCredit Usage:1 per callRefreshed 1 month ago
avg: 602ms|p50: 562ms|p75: 628ms|p90: 708ms|p99: 867ms

BMI Calculator is a simple tool for calculating body mass index. It returns the calculated BMI based on the weight and height provided.

The BMI Calculator API provides reliable and fast access to bmi calculator data through a simple REST interface. Built for developers who need consistent, high-quality results with minimal setup time.

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

GET Endpoint

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

Code Examples

Here are examples of how to call the BMI Calculator API in different programming languages:

cURL Request
curl -X GET \
  "https://api.apiverve.com/v1/bmicalculator?weight=70&height=170&unit=metric" \
  -H "X-API-Key: your_api_key_here"
JavaScript (Fetch API)
const response = await fetch('https://api.apiverve.com/v1/bmicalculator?weight=70&height=170&unit=metric', {
  method: 'GET',
  headers: {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
  }
});

const data = await response.json();
console.log(data);
Python (Requests)
import requests

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

response = requests.get('https://api.apiverve.com/v1/bmicalculator?weight=70&height=170&unit=metric', headers=headers)

data = response.json()
print(data)
Node.js (Native HTTPS)
const https = require('https');
const url = require('url');

const options = {
  method: 'GET',
  headers: {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
  }
};

const req = https.request('https://api.apiverve.com/v1/bmicalculator?weight=70&height=170&unit=metric', options, (res) => {
  let data = '';
  res.on('data', (chunk) => data += chunk);
  res.on('end', () => console.log(JSON.parse(data)));
});

req.end();
PHP (cURL)
<?php

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, 'https://api.apiverve.com/v1/bmicalculator?weight=70&height=170&unit=metric');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'X-API-Key: your_api_key_here',
    'Content-Type: application/json'
]);

$response = curl_exec($ch);
curl_close($ch);

$data = json_decode($response, true);
print_r($data);

?>
Go (net/http)
package main

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

)

func main() {
    req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/bmicalculator?weight=70&height=170&unit=metric", 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))
}
Ruby (Net::HTTP)
require 'net/http'
require 'json'

uri = URI('https://api.apiverve.com/v1/bmicalculator?weight=70&height=170&unit=metric')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

request = Net::HTTP::Get.new(uri)
request['X-API-Key'] = 'your_api_key_here'
request['Content-Type'] = 'application/json'

response = http.request(request)
puts JSON.pretty_generate(JSON.parse(response.body))
C# (HttpClient)
using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        using var client = new HttpClient();
        client.DefaultRequestHeaders.Add("X-API-Key", "your_api_key_here");

        var response = await client.GetAsync("https://api.apiverve.com/v1/bmicalculator?weight=70&height=170&unit=metric");
        response.EnsureSuccessStatusCode();

        var responseBody = await response.Content.ReadAsStringAsync();
        Console.WriteLine(responseBody);
    }
}

Authentication

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

Required 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:

Calculate Body Mass Index

ParameterTypeRequiredDescriptionDefaultExample
weightnumberrequired
The weight of the person in either kg or lb
Range: min: 1
-70
heightnumberrequired
The height of the person in cm or ft
Range: min: 1
-170
unitstringrequired
The unit of measurement for weight and height
Supported values: metricimperial
-metric

Response

The BMI Calculator API returns responses in JSON, XML, YAML, and CSV formats:

Example Responses

JSON Response
200 OK
{
  "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."
  }
}
XML Response
200 OK
<?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>
YAML Response
200 OK
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.
CSV Response
200 OK
keyvalue
height170 cm
weight70 kg
bmi24.221453287197235
riskLow risk
summaryThis weight is normal and you are healthy.
recommendationA 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:

FieldTypeDescriptionExample
statusstringIndicates whether the request was successful ("ok") or failed ("error")ok
errorstring | nullContains error message if status is "error", otherwise nullnull
dataobject | nullContains the API response data if successful, otherwise null{...}

Learn more about response formats →

Response Data Fields

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

FieldTypeSample Value
heightstring"170 cm"
weightstring"70 kg"
bminumber24.221453287197235
riskstring"Low risk"
summarystring"This weight is normal and you are healthy."
recommendationstring"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."

Headers

Required and optional headers for BMI Calculator API requests:

Header NameRequiredExample ValueDescription
X-API-Keyrequiredyour_api_key_hereYour APIVerve API key. Found in your dashboard under API Keys.
Acceptoptionalapplication/jsonSpecify response format: application/json (default), application/xml, or application/yaml
User-AgentoptionalMyApp/1.0Identifies your application for analytics and debugging purposes
X-Request-IDoptionalreq_123456789Custom request identifier for tracking and debugging requests
Cache-Controloptionalno-cacheControl caching behavior for the request and response

Learn more about 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.

Test BMI Calculator in the GraphQL Explorer to confirm availability and experiment with queries.

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

GraphQL Endpoint
POST https://api.apiverve.com/v1/graphql
GraphQL Query Example
query {
  bmicalculator(
    input: {
      weight: 70
      height: 170
      unit: "metric"
    }
  ) {
    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 supports Cross-Origin Resource Sharing (CORS) with wildcard configuration, allowing you to call BMI Calculator directly from browser-based applications without proxy servers.

CORS HeaderValueDescription
Access-Control-Allow-Origin*Accepts requests from any origin
Access-Control-Allow-Methods*Accepts any HTTP method
Access-Control-Allow-Headers*Accepts any request headers

Browser Usage: You can call BMI Calculator directly from JavaScript running in the browser without encountering CORS errors. No proxy server or additional configuration needed.

Learn more about CORS support →

Rate Limiting

BMI Calculator API requests are subject to rate limiting based on your subscription plan. These limits ensure fair usage and maintain service quality for all BMI Calculator users.

PlanRate LimitDescription
Free5 requests/minHard rate limit enforced - exceeding will return 429 errors
StarterNo LimitProduction ready - standard traffic priority
ProNo LimitProduction ready - preferred traffic priority
MegaNo LimitProduction ready - highest traffic priority

Learn more about rate limiting →

Rate Limit Headers

When rate limits apply, each BMI Calculator response includes headers to help you track your usage:

HeaderDescription
X-RateLimit-LimitMaximum number of requests allowed per time window
X-RateLimit-RemainingNumber of requests remaining in the current window
X-RateLimit-ResetUnix timestamp when the rate limit window resets

Handling Rate Limits

Free Plan: When you exceed your rate limit, BMI Calculator returns a 429 Too Many Requests status code. Your application should implement appropriate backoff logic to handle this gracefully.

Paid Plans: No rate limiting or throttling applied. All paid plans (Starter, Pro, Mega) are production-ready.

Best Practices for BMI Calculator:

  • Monitor the rate limit headers to track your BMI Calculator usage (Free plan only)
  • Cache bmi calculator responses where appropriate to reduce API calls
  • Upgrade to Pro or Mega for guaranteed no-throttle BMI Calculator performance

Note: BMI Calculator rate limits are separate from credit consumption. You may have credits remaining but still hit rate limits when using BMI Calculator on Free tier.

Error Codes

The BMI Calculator API uses standard HTTP status codes to indicate success or failure:

CodeMessageDescriptionSolution
200OKRequest successful, data returnedNo action needed - request was successful
400Bad RequestInvalid request parameters or malformed requestCheck required parameters and ensure values match expected formats
401UnauthorizedMissing or invalid API keyInclude x-api-key header with valid API key from dashboard
403ForbiddenAPI key lacks permission or insufficient creditsCheck credit balance in dashboard or upgrade plan
429Too Many RequestsRate limit exceeded (Free: 5 req/min)Implement request throttling or upgrade to paid plan
500Internal Server ErrorServer error occurredRetry request after a few seconds, contact support if persists
503Service UnavailableAPI temporarily unavailableWait and retry, check status page for maintenance updates

Learn more about error handling →

Need help? Contact support with your X-Request-ID for assistance.

Integrate BMI Calculator with SDKs

Get started quickly with official BMI Calculator SDKs for your preferred language. Each library handles authentication, request formatting, and error handling automatically.

Available for Node.js, Python, C#/.NET, and Android/Java. All SDKs are open source and regularly updated.

Integrate BMI Calculator with No-Code API Tools

Connect the BMI Calculator API to your favorite automation platform without writing code. Build workflows that leverage bmi calculator data across thousands of apps.

All platforms use your same API key to access BMI Calculator. Visit our integrations hub for step-by-step setup guides.

Frequently Asked Questions

How do I get an API key for BMI Calculator?
Sign up for a free account at dashboard.apiverve.com. Your API key will be automatically generated and available in your dashboard. The same key works for BMI Calculator and all other APIVerve APIs. The free plan includes 1,000 credits plus a 500 credit bonus.
How many credits does BMI Calculator cost?

Each successful BMI Calculator API call consumes credits based on plan tier. Check the pricing section above for the exact credit cost. Failed requests and errors don't consume credits, so you only pay for successful bmi calculator lookups.

Can I use BMI Calculator in production?

The free plan is for testing and development only. For production use of BMI Calculator, upgrade to a paid plan (Starter, Pro, or Mega) which includes commercial use rights, no attribution requirements, and guaranteed uptime SLAs. All paid plans are production-ready.

Can I use BMI Calculator from a browser?
Yes! The BMI Calculator API supports CORS with wildcard configuration, so you can call it directly from browser-based JavaScript without needing a proxy server. See the CORS section above for details.
What happens if I exceed my BMI Calculator credit limit?

When you reach your monthly credit limit, BMI Calculator API requests will return an error until you upgrade your plan or wait for the next billing cycle. You'll receive notifications at 80% and 95% usage to give you time to upgrade if needed.

What's Next?

Continue your journey with these recommended resources

Was this page helpful?