ForHosting KIT · Developer Utilities

Quadtree capacity calculator

A complete quadtree is the default spatial index when a square region is split into four congruent children at every level.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

Game collision worlds, GIS tile pyramids, light-probe grids, and image compression trees all share that skeleton. Before you allocate a node pool, size a GPU buffer, or pick a maximum zoom, you need the worst-case census: how many leaves sit at the chosen depth, and how many nodes exist if every branch is populated. This quadtree capacity calculator takes a non-negative integer depth d, treats the root as depth zero, and returns the exact leaf count four to the d, the geometric-series node total of four to the d-plus-one minus one over three, the internal-node remainder, and the two-to-the-d cells along each side of the leaf grid. The same pure arithmetic powers the free browser widget and the API path, so planning spreadsheets and production pre-flight checks never disagree on a power-of-four.

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/dev/quadtree-capacity

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/dev/quadtree-capacity \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"depth":3}'

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

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/dev/quadtree-capacity",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "depth": 3
},
)
task_id = res.json()["task_id"]

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

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

Example request

{
  "depth": 3
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "dev.quadtree_capacity",
  "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_depth 26

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 →