BMI CalculatorBMI Calculator

OnlineCredit Usage:1 per call
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" \
  -H "X-API-Key: your_api_key_here"
JavaScript (Fetch API)
const response = await fetch('https://api.apiverve.com/v1/bmicalculator', {
  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', 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', 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($ch, CURLOPT_URL, 'https://api.apiverve.com/v1/bmicalculator');
curl_setopt($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", 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')
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");
        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

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:

ParameterTypeRequiredDescriptionDefaultExample
weightnumberYesThe weight of the person in either kg or lb-70
heightnumberYesThe height of the person in cm or ft-170
unitstringYesThe unit of measurement for weight and height (metric or imperial)-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{...}

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 API requests:

Header NameRequiredExample ValueDescription
X-API-KeyYesyour_api_key_hereYour APIVerve API key. Found in your dashboard under API Keys.
AcceptNoapplication/jsonSpecify response format: application/json (default), application/xml, or application/yaml
User-AgentNoMyApp/1.0Identifies your application for analytics and debugging purposes
X-Request-IDNoreq_123456789Custom request identifier for tracking and debugging requests
Cache-ControlNono-cacheControl caching behavior for the request and response

GraphQL AccessALPHA

Most APIVerve APIs support GraphQL queries, allowing you to combine multiple API calls into a single request and retrieve only the data you need. This powerful feature enables you to orchestrate complex data fetching with precise field selection.

Not all APIs support GraphQL. Check the API schema or test in the GraphQL Explorer to confirm availability for this specific endpoint.

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 make direct API calls from JavaScript running in the browser without encountering CORS errors. No additional configuration needed.

Rate Limiting

APIVerve implements rate limiting to ensure fair usage and maintain service quality across all users. Rate limits vary by subscription plan and are applied per API key.

PlanRate LimitDescription
Free5 requests/minHard rate limit enforced - exceeding will return 429 errors
StarterNo LimitProduction ready - no rate limiting or throttling
ProNo LimitProduction ready - no rate limiting or throttling
MegaNo LimitProduction ready - no rate limiting or throttling

Rate Limit Headers

When rate limits apply, each API 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:

  • Monitor the rate limit headers to track your usage (Free plan only)
  • Implement caching where appropriate to reduce API calls
  • Upgrade to Pro or Mega for guaranteed no-throttle performance

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

Client Libraries

To get started with minimal code, most of our APIs are available through client libraries and clients:

NPMPyPINuGetSwagger

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

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

Integrate BMI Calculator with No-Code 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?
Sign up for a free account at dashboard.apiverve.com. Your API key will be automatically generated and available in your dashboard. The free plan includes 1,000 credits plus a 500 credit bonus.
What are credits and how do they work?

Credits are your API usage currency. Each successful API call consumes credits based on the API's complexity. Most APIs cost 1 credit per call, while more complex APIs may cost 2-5 credits. Failed requests and errors don't consume credits. Check the API details above to see the credit cost for this specific API.

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 credit limit?

When you reach your monthly credit limit, 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

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