Torr to atm converter
760 torr is exactly 1 atm. Turn a vacuum-gauge or manometer reading in torr into standard atmospheres with one exact division by 760, for gas-law homework, vacuum process sheets and chemistry lab reports. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Torr
- 760
- Result
- 1 atm
- Converted
- 1
- Atm
- 1
- From unit
- torr
A torr-to-atmosphere converter turns a vacuum-gauge or mercury-manometer reading in torr into the standard-atmosphere value used in gas-law homework, vacuum process sheets, chemistry laboratory reports, and many STP reference tables.
Why torr and atmospheres still meet at an exact 760
The torr remains the everyday vacuum-gauge unit on roughing pumps, rotary-vane forelines, laboratory glassware manometers, freeze-dryer charts, mass-spectrometer inlets, and many chemistry problem sets that still quote vapor pressure in torr rather than pascals. Standard atmospheres belong to the gas-law and STP family used in textbooks, ideal-gas homework, compressor datasheets, and weather reference tables that fix one atmosphere as the baseline pressure scale.
The bridge between them is not a memorised survey shortcut: by definition, one torr is exactly one seven-hundred-sixtieth of a standard atmosphere, so one atmosphere equals exactly seven hundred sixty torr. That makes the conversion a single exact division: atmospheres equal torr divided by seven hundred sixty. Teachers sometimes still treat torr and millimetres of mercury as interchangeable classroom nicknames, but this landing converts the torr as defined, not a mercury-density millimetre, and it never applies a rounded table snippet as the computation constant.
Zero torr maps cleanly to zero atmospheres. Negative values are rejected because an absolute torr-to-atm conversion is not a signed gauge-delta tool: a negative absolute pressure is not a physical atmosphere reading, and inventing a negative atmosphere would mislead homework checks and vacuum sheets. Practically, seven hundred sixty torr is the one-atmosphere identity check every vacuum technician and chemistry student learns first, and this tool preserves that identity after fixed twelve-decimal rounding.
Practical checks, limits, and related searches
Round-trip sanity checks are easy: convert seven hundred sixty torr and confirm you receive exactly one atmosphere after rounding, or convert three hundred eighty torr and confirm the result is one half of an atmosphere within the same twelve-decimal policy. Convert one torr and you should see the rounded factor itself, which is the reciprocal of seven hundred sixty. When teaching, pair the exact path with the mental identity of seven hundred sixty torr per atmosphere so students see that the definition is preserved without intermediate truncation.
Stay inside the absolute range so the divide cannot overflow into a non-finite result the solver must reject. This landing targets people searching for torr to atm, convert torr to atmospheres, torr to atm calculator, or an exact vacuum pressure converter; it is not a general multi-unit pressure hub, not an atm-to-torr primary form, not a millimetre-of-mercury landing, and not a blood-pressure or tyre-load tool.
Prefer this capability when the input is already in torr and you only need standard atmospheres; if you must convert among many pressure units in one call, use a broader pressure converter instead.
What you can do with it
Vacuum pump and roughing-gauge sheets
Turn a non-negative torr reading from a thermocouple or Pirani gauge into standard atmospheres for process sheets that still quote atm setpoints.
Chemistry lab and gas-law homework
Convert manometer or vapor-pressure values in torr into atmospheres with the exact 1/760 factor and pasteable substitution steps for lab reports.
Teaching and worksheet identity checks
Students convert classroom torr readings to atm, confirm that 760 torr is one atmosphere, and reject signed nonsense before it reaches a notebook.
FAQ
Why are negative torr values rejected?
This converter maps absolute torr pressure to standard atmospheres.
Is one torr exactly 1/760 of an atmosphere?
Yes. The torr is defined as exactly 1/760 of a standard atmosphere. This calculator hard-codes that definition rather than a rounded survey approximation.
What input field do I send?
Send a non-negative finite number in the field torr.
Is the torr to atm converter free?
The browser tool is free and runs locally.
Is a torr the same as a millimetre of mercury here?
Not quite. This converter uses the torr as defined, exactly 1/760 of a standard atmosphere, not a millimetre of mercury based on the density of mercury. Classrooms often treat them as nicknames for each other.
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/torr-to-atm \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"torr":760}'const res = await fetch("https://api.kit.forhosting.com/conv/torr-to-atm", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"torr": 760
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/conv/torr-to-atm",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"torr": 760
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/conv/torr-to-atm", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"torr":760}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"torr":760}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/conv/torr-to-atm", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"torr": 760
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "conv.torr_to_atm",
"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
Negative values and non-numeric input fail with a clear invalid_input error instead of inventing a number.
How to call the API and what comes back
The value must be greater than or equal to zero and must stay within the published limit of one trillion. When embedding in scripts, treat the response as pure data: read atm or result for the magnitude, and use steps only when you want human-readable audit text. Keep clients tolerant of extra fields so future additive metadata does not break parsers. Send a JSON body with one required non-negative finite number field named torr. Aliases Torr, value, pressure, and torr_value are accepted so SDK clients and form posts can use the name that fits the product. On success the response echoes rounded torr, sets atm, result, and converted to the same rounded atmosphere magnitude, unit to the token atm, from_unit to torr and to_unit to atm, factor and atm_per_torr to the rounded exact conversion factor one over seven hundred sixty, torr_per_atm to the integer seven hundred sixty, 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, negative values, 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. Prefer bare JSON 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 embedded in the field.
Practical checks, limits, and related searches
Failed tasks that return invalid_input do not consume prepaid balance, which keeps exploratory scripts cheap when learners deliberately omit torr, pass text, or send a negative reading. Document the factor one atmosphere equals seven hundred sixty torr in lab notebooks next to the numerical result so reviewers can recompute offline without opening the API again. Identity checks such as 760 torr mapping to 1 atm are the fastest way to confirm a client parsed the JSON number rather than a truncated integer.
Technical questions
What factor converts torr to atm?
By definition, one torr is exactly 1/760 of a standard atmosphere, so 1 atm = 760 torr. The tool computes atm = torr / 760 and rounds to twelve decimal places for stable JSON.