ATM to PSI converter
1 atm is 14.695948775513 psi, not a rounded 14.7. This converter turns standard-atmosphere readings from textbooks or European data sheets into the pounds per square inch used on US tyre gauges, compressor specs and scuba charts. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Pressure in standard atmospheres
- 1
- Result
- 14.6959487755 psi
- Converted
- 14.6959487755
- Psi
- 14.6959487755
- From unit
- atm
An atmospheres-to-psi converter turns a standard atmospheric pressure reading into the pounds-per-square-inch value used on tyre gauges, compressor specs, scuba charts, and many United States process sheets. Rough classroom shortcuts such as multiply by fourteen point seven are rejected in favour of the full SI-derived constant, so homework checks and catalog exports match engineering tables.
Why atmospheres and psi still meet at an exact factor
Standard atmospheres belong to the gas-law and weather family used in chemistry textbooks, barometric reference tables, and ideal-gas homework. Pounds per square inch remain the everyday pressure unit on many United States tyre placards, air-tool ratings, hydraulic benches, and process instrumentation.
The bridge between them is not a memorised fourteen point seven rule of thumb: one standard atmosphere is defined as exactly one hundred one thousand three hundred twenty-five pascals, and one pound-force per square inch follows from the international avoirdupois pound, standard gravity nine point eight zero six six five metres per second squared, and the exact inch of zero point zero two five four metres. That makes the conversion a single exact multiplication, psi equals atmospheres times the ratio of those two pressure scales.
Teachers often still teach multiply by fourteen point seven, but that truncates several significant figures and drifts on multi-atmosphere compressor stages or laboratory gauge chains.
Practical tips, checks, and related searches
Prefer sending bare numbers when you control the client; string numbers are accepted only when they match a strict finite numeric pattern without units, thousand separators, or currency symbols. Round-trip sanity checks are easy: convert one atmosphere and confirm you receive about fourteen point six nine five nine four eight seven seven five five one three psi after rounding, or convert two atmospheres and confirm the result doubles within the same twelve-decimal policy.
When teaching, pair the exact path with the fourteen point seven mental shortcut so students see the truncated error on multi-atmosphere stages. Stay inside the absolute range so the multiply cannot overflow into a non-finite result the solver must reject. This landing targets people searching for atm to psi, convert atmospheres to psi, or an exact atmosphere pressure calculator; it is not a general multi-unit pressure hub, not a psi-to-atm primary form, not a vacuum torr converter, and not a tyre-load or scuba dive-table tool.
Prefer this capability when the input is already in standard atmospheres and you only need psi; if you must convert among many pressure units in one call, use a broader pressure converter instead.
What you can do with it
Compressor and process-sheet unit bridging
Turn standard-atmosphere setpoints from European or textbook sources into psi fields on US equipment sheets with the same exact factor every row.
Homework and lab report checks
Students convert classroom atm readings to psi and compare hand work against deterministic steps before submitting worksheets.
Scuba, tyre, and gauge cross-checks
Hobbyists and technicians map atm-scale reference tables into psi gauge expectations without relying on a rounded 14.7 shortcut.
FAQ
What factor converts atm to psi?
One standard atmosphere is 101325 Pa exactly. One psi is one pound-force per square inch from the international pound, standard gravity, and the exact inch. The tool multiplies atm by that exact SI-derived ratio (about 14.695948775513).
Is 14.7 psi per atmosphere exact?
No. 14.7 is a common classroom rounding. This converter uses the full SI-derived factor so results match engineering tables after fixed twelve-decimal rounding.
What input field do I send?
Send a finite number in the field atm.
Is the atm to psi converter free?
The browser tool is free and runs locally.
Where does the psi side of the factor come from?
A pound per square inch is built from the international pound, standard gravity of 9.80665 m/s² and the exact inch of 0.0254 m. Dividing 101,325 pascals by that pressure gives 14.695948775513 psi per atmosphere.
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/conv/atm-to-psi \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"atm":1}'const res = await fetch("https://api.kit.forhosting.com/conv/atm-to-psi", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"atm": 1
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/conv/atm-to-psi",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"atm": 1
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/conv/atm-to-psi", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"atm":1}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"atm":1}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/conv/atm-to-psi", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"atm": 1
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "conv.atm_to_psi",
"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.
Limits
max_abs | 1000000000000 |
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.
How to call the API and what comes back
Absolute values must stay within the published limit of one trillion. Send a JSON body with one required finite number field named atm. Aliases atmospheres, atmosphere, value, pressure, and atm_value are accepted so SDK clients and form posts can use the name that fits the product. On success the response echoes rounded atm, sets psi, result, and converted to the same rounded pound-per-square-inch magnitude, unit to the token psi, from_unit to atm and to_unit to psi, factor and psi_per_atm to the rounded exact conversion factor, pa_per_atm to the integer one hundred one thousand three hundred twenty-five, formula to a short English equation string, message to a brief 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 and zero marginal unit price.
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 atm or pass text.
Technical questions
What happens on invalid input?
Missing fields, non-finite numbers, or values outside the absolute limit return invalid_input. Failed tasks are never charged.