ForHosting KIT · Developer Utilities

Engineering notation converter

This engineering notation converter rewrites a finite number into the form mantissa times ten raised to an exponent that is always a multiple of three, which is the standard engineers use when reading component values, scopes, datasheets, and lab notes.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

Unlike pure scientific notation, where the mantissa stays between one and ten, engineering notation keeps the mantissa between one and one thousand so the power of ten lines up with SI prefixes such as milli, kilo, mega, and giga. Small checks you can verify by hand include twelve thousand three hundred forty-five point six becoming about twelve point three four five six times ten to the three (or twelve point three four five six kilo), and zero point zero zero zero four seven becoming four hundred seventy times ten to the minus six (or four hundred seventy micro). The engine is fully deterministic: it uses only finite arithmetic, a fixed SI prefix table from quecto through quetta, and no network calls, randomness, or date-dependent shortcuts. Use it free in the browser for homework, lab write-ups, and firmware comments, or call the API at $0.002 per successful request when you need reproducible fixtures in CI, documentation generators, or teaching demos.

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/fmt/engineering-notation

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/fmt/engineering-notation \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"value":12345.6}'

const res = await fetch("https://api.kit.forhosting.com/fmt/engineering-notation", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "value": 12345.6
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/fmt/engineering-notation",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "value": 12345.6
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/fmt/engineering-notation", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"value":12345.6}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"value":12345.6}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/fmt/engineering-notation", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "value": 12345.6
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "fmt.engineering_notation",
  "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_abs_value`	1e+300
`max_precision`	15

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 →

Run — free