ForHosting KIT · Developer Utilities

RPM to linear speed calculator

This RPM to linear speed calculator converts rotational speed in revolutions per minute and a path radius into the linear speed at the rim, also called tangential speed.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

The identity is fully closed form: frequency in hertz equals rpm divided by sixty, angular velocity omega equals two pi times that frequency, and linear speed v equals omega times radius, which expands to v equals two pi r times rpm over sixty. When radius is in metres and rpm is revolutions per minute, the result is metres per second; any consistent length unit works the same way for the speed unit you care about. Zero rpm yields zero linear speed; zero radius yields zero rim speed at any finite spin rate. Negative radius is rejected because a geometric path radius cannot be negative. The engine is deterministic arithmetic only: no network calls, no sampling, and no date-dependent shortcuts. Use it free in the browser for homework, machine-design checks, and conveyor or wheel sizing, or call the API at $0.002 per successful request when you need reproducible rim-speed fixtures in CI, CAD helpers, or teaching demos that must not invent floating-point steps by hand.

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/mech/rpm-to-linear

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/mech/rpm-to-linear \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"rpm":60,"radius":0.25}'

const res = await fetch("https://api.kit.forhosting.com/mech/rpm-to-linear", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "rpm": 60,
    "radius": 0.25
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/mech/rpm-to-linear",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "rpm": 60,
    "radius": 0.25
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/mech/rpm-to-linear", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"rpm":60,"radius":0.25}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"rpm":60,"radius":0.25}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/mech/rpm-to-linear", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "rpm": 60,
  "radius": 0.25
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "mech.rpm_to_linear",
  "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_rpm`	1000000000000000
`max_abs_radius`	1000000000000000

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