ForHosting KIT · Developer Utilities

Tree height calculator

Foresters, arborists, ecology students, and outdoor educators routinely need a tree's height without climbing it or bringing a laser rangefinder.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

The classic tangent method uses two field measurements: the horizontal distance from the observer to the trunk, and the angle of elevation from eye level up to the crown. Tangent of that angle equals opposite over adjacent, so the rise from eye to crown is distance times tan of the elevation angle; adding observer eye height then yields total height from the ground. This calculator takes a positive distance in any consistent linear unit, an elevation angle in degrees strictly between zero and ninety, and an optional non-negative observer height that defaults to zero. It converts the angle to radians, applies that closed identity, and returns the tree height in the same unit as the distance. Angles at or outside the open interval (0, 90) are rejected because tan(0) is a degenerate flat sight and tan(90°) is undefined. The free browser tool and the API share one pure function, so a lab worksheet and a batch inventory script never silently disagree.

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/bio/tree-height

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/bio/tree-height \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"distance":50,"angle_deg":30}'

const res = await fetch("https://api.kit.forhosting.com/bio/tree-height", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "distance": 50,
    "angle_deg": 30
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/bio/tree-height",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "distance": 50,
    "angle_deg": 30
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/bio/tree-height", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"distance":50,"angle_deg":30}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"distance":50,"angle_deg":30}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/bio/tree-height", 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": 50,
  "angle_deg": 30
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "bio.tree_height",
  "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 →