Pounds per minute converter
Sixty pounds per minute is exactly 0.45359237 kg/s, because the minute cancels and only the exact pound is left. Enter a mass flow in lb/min and get kilograms per second from the full international pound, not a rounded shortcut. Free in your browser.
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- Your data stays on your device
Run — free
Worked example
- Pounds per minute
- 60
- Result
- 0.45359237 kg/s
- Converted
- 0.45359237
- Kilograms per second
- 0.45359237
- From unit
- lb/min
A pounds-per-minute converter turns a US customary mass-flow reading in avoirdupois pounds per minute into the SI kilograms-per-second value used in process datasheets, piping balances, and international lab notes. Approximate mental shortcuts such as 0.00756 kilograms per second per pound per minute are rejected in favour of the full CIPM pound and the exact sixty-second minute, so homework checks and plant exports match standard conversion tables.
Why pounds per minute and kilograms per second meet at 0.45359237 / 60
Pounds per minute remain common in US customary process sketches, North American pump and compressor data sheets, older HVAC notes, and many plant handbooks that still quote lb/min rather than kg/s. The bridge between them is exact for the international definitions: one avoirdupois pound is exactly 0.45359237 kilograms by the 1959 international yard and pound agreement, and one minute is exactly sixty seconds of SI time. That makes the conversion a single exact multiplication, kilograms per second equals pounds per minute times 0.45359237 divided by 60.
Teachers can contrast the exact path with a rough 0.00756 rule of thumb so students see the small relative error that accumulates on large plant figures when the truncated constant is reused row after row. A useful identity for checking homework is that sixty pounds per minute is exactly 0.45359237 kilograms per second, because the minute cancels and you are left with the pound-to-kilogram factor alone.
Practical tips, checks, and related searches
Round-trip sanity checks are easy: convert one pound per minute and confirm you receive about 0.007559872833 kilograms per second after rounding, or convert sixty pounds per minute and confirm exactly 0.45359237 kilograms per second because the minute cancels. If your source table quotes pounds per hour rather than pounds per minute, divide the hourly figure by sixty before treating it as lb/min, or use a broader mass-flow converter that already lists lb/h. Stay inside the absolute range so the product cannot overflow into a non-finite result the solver must reject.
When teaching unit analysis, pair a plant example such as a feed of sixty pounds per minute with the pure conversion so students see that one pound per minute is smaller than one kilogram per second and that the same exact pound appears in both SI and US customary worksheets.
This landing targets people searching for pounds per minute, convert lb/min to kg/s, or a pounds-per-minute mass flow calculator; it is not a multi-unit mass-flow hub, not a kilograms-per-second-to-pounds-per-minute primary form, not a pounds-per-hour landing, and not a volumetric GPM or CFM calculator. Prefer this capability when the input is already in pounds per minute and you only need kilograms per second.
What you can do with it
Process and piping data sheets
Convert US customary feed, product, or recycle streams quoted in lb/min into kg/s for SI heat and mass balances, control logic, and international datasheets with the same exact factor every row.
FAQ
Why 0.45359237 kilograms and 60 seconds?
The international avoirdupois pound is defined as exactly 0.45359237 kg. A minute is exactly 60 SI seconds. The converter hard-codes both so lb/min to kg/s is a single exact product.
Is this mass flow or volumetric flow?
Pounds per minute and kilograms per second are mass-flow units. They do not need density. Volumetric units such as GPM or CFM are a different conversion and are out of scope here.
Is the pounds per minute converter free?
The browser tool is free and runs locally.
How many kg/s is 1 lb/min?
About 0.007559872833 kilograms per second. That is 0.45359237 kilograms, the exact international pound, divided by the 60 seconds in a minute.
How do I convert pounds per hour instead?
Divide the hourly figure by 60 first so it becomes pounds per minute, then convert it here. A broader mass flow converter that already lists lb/h saves that extra step.
Related tools
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
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/phys/pounds-per-minute \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"pounds_per_minute":60}'const res = await fetch("https://api.kit.forhosting.com/phys/pounds-per-minute", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"pounds_per_minute": 60
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/phys/pounds-per-minute",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"pounds_per_minute": 60
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/phys/pounds-per-minute", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"pounds_per_minute":60}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"pounds_per_minute":60}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/phys/pounds-per-minute", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"pounds_per_minute": 60
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "phys.pounds_per_minute",
"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
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. |
Technical notes
Invalid or missing input fails with a clear invalid_input error instead of inventing a number.
Why pounds per minute and kilograms per second meet at 0.45359237 / 60
The kilogram per second is the SI coherent unit of mass flow: one kilogram of mass crossing a control surface every second, and the common reporting unit for process streams, fuel feed, slurry transport, and conservation balances in modern science.
How to call the API and what comes back
Absolute values must stay within the published limit of one trillion. Prefer bare numbers when you control the client; string numbers are accepted only when they match a strict finite numeric pattern without unit suffixes or thousand separators. Do not send a unit string in the same field as the number; the field is always pounds per minute. Send a JSON body with one required finite number field named pounds_per_minute. Aliases value, lb_min, lb_per_min, rate, and flow are accepted so SDK clients and form posts can use the name that fits the product. On success the response echoes rounded pounds_per_minute, sets kilograms_per_second, result, and converted to the same rounded kilograms-per-second magnitude, unit and to_unit to the token kg/s, from_unit to lb/min, factor to the rounded multiplier 0.45359237 divided by 60, kg_per_lb to 0.45359237, seconds_per_minute to 60, formula to the string kilograms_per_second equals pounds_per_minute times 0.45359237 divided by 60, message to a short English summary, and steps to an ordered array of substitution lines. Failed validation—missing fields, non-finite numbers, bare plus or minus signs, non-numeric strings, values outside absolute limits, or a non-finite converted result—returns invalid_input and is never charged. Pricing is a flat $0.002 per successful request with unit item.
Practical tips, checks, and related searches
Failed tasks that return invalid_input do not consume prepaid balance, which keeps exploratory scripts cheap when learners deliberately omit pounds_per_minute or pass text.
Integration use cases
Homework and exam checks
Students convert classroom pounds-per-minute readings to kilograms per second and compare hand work against deterministic steps before submitting worksheets or coding kata fixtures.
Lab and plant unit alignment
Notes that mix lb/min and kg/s can be normalized for SI exports, historians, and API payloads without fragile hand-typed factor tables or 0.454 kg shortcuts.
Technical questions
How many kilograms per second are in one pound per minute?
Exactly 0.45359237 / 60 kg/s, about 0.007559872833 kg/s after rounding: kilograms_per_second = pounds_per_minute × 0.45359237 / 60.
What happens on invalid input?
Missing fields, non-finite values, non-numeric strings, or values outside the absolute limits return invalid_input and are never charged.