ForHosting KIT · Developer Utilities

Parrillo 9-site body fat calculator

Parrillo 9-site body fat 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 the Parrillo 9-site body fat formula?

Sum the nine skinfolds in millimeters (chest, abdomen, thigh, biceps, triceps, subscapular, suprailiac, lower back, calf), multiply by 27, and divide by body weight in pounds: body_fat_percent = (27 × sum_mm) / weight_lb.

Do males and females use different Parrillo equations?

No. The classic Parrillo method uses one equation for everyone and does not include age. Other methods (Jackson-Pollock, US Navy) branch on sex or age; this endpoint does not.

What units do the inputs need?

Skinfolds must be in millimeters and weight in pounds (lb). Convert kilograms to pounds first if needed (multiply kg by about 2.2046). Missing or non-positive values return invalid_input.

How accurate is the Parrillo method?

It is a field estimate of subcutaneous fat distribution. Accuracy depends on caliper skill, site placement, and hydration. It is not a medical diagnosis and is best used for consistent tracking with the same tester and protocol.

What does the Parrillo body fat calculator cost?

The browser tool is free. API requests use prepaid KIT balance at $0.002 per successful call; invalid input is not billed.

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/bodyfat-parrillo

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/bodyfat-parrillo \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"chest_mm":8,"abdomen_mm":20,"thigh_mm":14,"biceps_mm":6,"triceps_mm":10,"subscapular_mm":14,"suprailiac_mm":16,"lower_back_mm":18,"calf_mm":8,"weight_lb":175}'

const res = await fetch("https://api.kit.forhosting.com/health/bodyfat-parrillo", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "chest_mm": 8,
    "abdomen_mm": 20,
    "thigh_mm": 14,
    "biceps_mm": 6,
    "triceps_mm": 10,
    "subscapular_mm": 14,
    "suprailiac_mm": 16,
    "lower_back_mm": 18,
    "calf_mm": 8,
    "weight_lb": 175
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/health/bodyfat-parrillo",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "chest_mm": 8,
    "abdomen_mm": 20,
    "thigh_mm": 14,
    "biceps_mm": 6,
    "triceps_mm": 10,
    "subscapular_mm": 14,
    "suprailiac_mm": 16,
    "lower_back_mm": 18,
    "calf_mm": 8,
    "weight_lb": 175
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/health/bodyfat-parrillo", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"chest_mm":8,"abdomen_mm":20,"thigh_mm":14,"biceps_mm":6,"triceps_mm":10,"subscapular_mm":14,"suprailiac_mm":16,"lower_back_mm":18,"calf_mm":8,"weight_lb":175}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"chest_mm":8,"abdomen_mm":20,"thigh_mm":14,"biceps_mm":6,"triceps_mm":10,"subscapular_mm":14,"suprailiac_mm":16,"lower_back_mm":18,"calf_mm":8,"weight_lb":175}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/health/bodyfat-parrillo", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "chest_mm": 8,
  "abdomen_mm": 20,
  "thigh_mm": 14,
  "biceps_mm": 6,
  "triceps_mm": 10,
  "subscapular_mm": 14,
  "suprailiac_mm": 16,
  "lower_back_mm": 18,
  "calf_mm": 8,
  "weight_lb": 175
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "health.bodyfat_parrillo",
  "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.

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 →