ForHosting KIT · Developer Utilities

Parts per thousand calculator

Parts per thousand, written as the per-mille sign or ppt by mass, answers a common analytical question: how many parts of solute are present in each one thousand parts of solution by mass?

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

Oceanographers quote salinity near thirty-five parts per thousand, clinical and environmental labs report dilute analytes on the same scale, and classroom stoichiometry converts mass fraction into a readable whole-number concentration. This capability computes that value deterministically from solute mass and total solution mass using the definition parts per thousand equals mass of solute divided by total mass times one thousand, also returns mass fraction and solvent mass for pipeline math, and rejects zero or negative total mass with a clear invalid input error so notebooks, LIMS hooks, and homework checkers never see Infinity. The free browser parts per thousand calculator runs on your device with no account; the prepaid API charges $0.002 per successful item when servers and SDKs need the same stable contract.

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/chem/parts-per-thousand

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/chem/parts-per-thousand \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"solute_mass":5,"total_mass":1000}'

const res = await fetch("https://api.kit.forhosting.com/chem/parts-per-thousand", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "solute_mass": 5,
    "total_mass": 1000
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/chem/parts-per-thousand",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "solute_mass": 5,
    "total_mass": 1000
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/chem/parts-per-thousand", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"solute_mass":5,"total_mass":1000}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"solute_mass":5,"total_mass":1000}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/chem/parts-per-thousand", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "solute_mass": 5,
  "total_mass": 1000
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "chem.parts_per_thousand",
  "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 →

Run — free