ForHosting KIT · Developer Utilities

VO2 max Cooper test calculator

The Cooper 12-minute test is a field protocol that estimates maximal oxygen uptake from how far you can run or walk in exactly twelve minutes.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

Kenneth H. Cooper’s classic formula converts that distance into VO2 max in millilitres per kilogram per minute, giving coaches, PE teachers, and endurance athletes a practical aerobic-fitness number without a metabolic cart. This capability takes the distance covered, optionally in metres, kilometres, or miles, applies VO2 max equals distance in metres minus five hundred four point nine, all divided by forty-four point seven three, and returns structured JSON with both distance normalisations and the estimated VO2 max. The path is pure arithmetic with no network and no random seed, so homework checkers, training apps, and prepaid API clients get identical results every time. Non-positive distance is rejected as invalid input because a zero or negative coverage cannot describe a completed Cooper trial. The browser widget runs free on your device; the prepaid API charges $0.002 per successful item when servers and SDKs need the same contract.

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 Cooper VO2 max formula?

With distance in metres covered in 12 minutes, VO2 max in ml/kg/min is (distance_m − 504.9) / 44.73. Equivalently, 22.351 × distance_km − 11.288. This calculator applies the metre form exactly.

What happens if distance is zero or negative?

The request fails with invalid_input. Distance must be a positive value describing how far you covered in the 12-minute test; non-positive distance is rejected and not charged.

Which units can I use for distance?

Default unit is metres (m). You may set unit to km or mi; the engine converts to metres before applying the classic Cooper constants.

Is the VO2 max Cooper test calculator free?

The browser tool runs free on your device. API calls use prepaid KIT balance at $0.002 per successful item; validation failures are not charged.

Is this the same as laboratory VO2 max?

No. This is a field estimate from the 12-minute Cooper regression, not gas-exchange VO2 peak from a metabolic cart. Use it for practical aerobic screening, not clinical diagnosis.

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/vo2max-cooper

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/vo2max-cooper \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"distance":2800}'

const res = await fetch("https://api.kit.forhosting.com/health/vo2max-cooper", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "distance": 2800
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/health/vo2max-cooper",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "distance": 2800
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/health/vo2max-cooper", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"distance":2800}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"distance":2800}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/health/vo2max-cooper", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "distance": 2800
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "health.vo2max_cooper",
  "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 →

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