ForHosting KIT · Developer Utilities

Waist-to-hip ratio calculator

Waist-to-hip ratio calculator: enter your values and see a clear result on this page. Free for individual checks; API from $0.002.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

How to use it

Enter your values in the form above. The tool checks them before calculating and shows the result on the same page.

Check your inputs

Use the labels and units shown next to each field. If something is missing or outside the allowed range, the page points to the field to fix.

Use it again or automate it

Use the browser tool for individual checks and the API when you need the same capability in an automated workflow.

What you can do with it

Get an answer now

Enter one set of values and see the result without building a spreadsheet or script.

Compare scenarios

Change one value at a time and rerun the calculation to understand what affects the result.

Automate repeated work

Use the API when the same calculation needs to run inside your product or workflow.

FAQ

What is waist-to-hip ratio?

WHR is waist circumference divided by hip circumference in the same unit. It is a unitless index of central versus lower-body girth used in metabolic-risk screening.

Why does hip circumference of zero fail?

Division by zero is undefined. This tool returns invalid_input when hip is zero or non-positive instead of inventing an infinite ratio.

Which risk thresholds are used?

Female: low below 0.80, moderate from 0.80, high at 0.85 and above. Male: low below 0.90, moderate from 0.90, high at 1.00 and above. These are WHO-aligned screening bands, not a diagnosis.

Do centimetres and inches change the result?

No, if both measurements use the same unit. The ratio is unitless; the optional unit field is only a label echoed in the response.

Is the waist-to-hip ratio calculator free?

The browser tool is free and runs locally. API calls use prepaid KIT balance at $0.002 per successful request; failed tasks are never charged.

For developers — API access

Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.

API endpoint

POSThttps://api.kit.forhosting.com/health/waist-hip-ratio

Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.

Call it from your stack

curl -X POST https://api.kit.forhosting.com/health/waist-hip-ratio \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"waist":80,"hip":100,"sex":"female"}'

const res = await fetch("https://api.kit.forhosting.com/health/waist-hip-ratio", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "waist": 80,
    "hip": 100,
    "sex": "female"
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/health/waist-hip-ratio",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "waist": 80,
    "hip": 100,
    "sex": "female"
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/health/waist-hip-ratio", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"waist":80,"hip":100,"sex":"female"}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"waist":80,"hip":100,"sex":"female"}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/health/waist-hip-ratio", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "waist": 80,
  "hip": 100,
  "sex": "female"
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "health.waist_hip_ratio",
  "status": "queued",
  "_links": {
    "result": "/tasks/tsk_…/result"
  }
}

The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.

Pricing

Per request$0.002

Published price — no tokens, no invented credits. A failed task is never charged.

Limits

max_circumference 1000

Errors

HTTP	Code	Meaning
`401`	`unauthorized`	Missing or invalid API key.
`402`	`insufficient_balance`	Your balance doesn't cover the task price.
`404`	`unknown_type`	That task type doesn't exist.
`429`	`rate_limited`	Too many requests. Use the webhook instead of polling.

Read the full KIT documentation →

Run — free