ForHosting KIT · Developer Utilities

Sphere volume calculator

A sphere is the set of points in three-dimensional space at a fixed positive distance from a center.

● BetaFree · in your browser

Use it from WebAPIEmailTelegramApp soon

That distance is the radius; the diameter is twice the radius and is the longest chord through the solid. Once either the radius or the diameter is known and strictly positive, every classical metric of the solid is determined: the volume is four-thirds pi times the cube of the radius, and the surface area is four pi times the square of the radius. Students meet these formulas in solid-geometry homework, exams, and contest problems; engineers, designers, and makers need the same numbers when a drawing, bill of materials, or packaging note lists only a radius or only a diameter. This capacity accepts exactly one of radius or diameter, rejects negative and non-positive values and ambiguous multi-field inputs, and returns radius, diameter, volume, and surface area as structured JSON. The same pure function powers the free browser widget and the prepaid API path, so a golden server example matches what a visitor runs locally with no network round trip and no language-model involvement.

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

How do I use this capability?

Complete the fields above and run it on this page. The form highlights anything that needs attention.

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/geom/sphere-volume

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/geom/sphere-volume \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"radius":3,"diameter":6}'

const res = await fetch("https://api.kit.forhosting.com/geom/sphere-volume", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "radius": 3,
    "diameter": 6
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/geom/sphere-volume",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "radius": 3,
    "diameter": 6
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/geom/sphere-volume", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"radius":3,"diameter":6}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"radius":3,"diameter":6}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/geom/sphere-volume", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "radius": 3,
  "diameter": 6
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "geom.sphere_volume",
  "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 →