ForHosting KIT · Developer Utilities

SI vs IEC byte converter

Hard-drive boxes, SSD stickers, and cloud invoices almost always print capacity in SI decimal units: one gigabyte is exactly one billion bytes and one terabyte is one trillion.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

File managers on Windows, macOS, Linux, and many embedded tools count with IEC binary prefixes instead: one gibibyte is two to the thirtieth bytes and one tebibyte is two to the fortieth. That single choice is why a disk sold as one terabyte often appears as roughly nine hundred thirty-one gibibytes after formatting, and why teams argue about missing storage that was never missing—only relabeled. This SI versus IEC byte unit converter takes a finite non-negative size, a source unit, and a target unit, multiplies through an exact byte base using powers of ten or powers of two, and returns the converted value plus a manufacturer-versus-operating-system explanation when the source is a graded storage label such as GB or GiB. The path is pure arithmetic: free in the browser widget, deterministic for continuous-integration goldens, and $0.002 per successful API item when automation needs the same contract as the public page.

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/si-vs-iec-bytes

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/si-vs-iec-bytes \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"value":1000,"from":"GB","to":"GiB"}'

const res = await fetch("https://api.kit.forhosting.com/dev/si-vs-iec-bytes", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "value": 1000,
    "from": "GB",
    "to": "GiB"
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/dev/si-vs-iec-bytes",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "value": 1000,
    "from": "GB",
    "to": "GiB"
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/dev/si-vs-iec-bytes", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"value":1000,"from":"GB","to":"GiB"}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"value":1000,"from":"GB","to":"GiB"}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/dev/si-vs-iec-bytes", 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": 1000,
  "from": "GB",
  "to": "GiB"
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "dev.si_vs_iec_bytes",
  "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 →