ForHosting KIT · Unit converters

Vacuum pressure converter

760 torr make one standard atmosphere, 101,325 Pa. Convert vacuum readings between torr, millitorr, microns, mmHg, millibar, pascals, kilopascals, hectopascals, bar, atmospheres and psi, with the pascal value and the steps for a process log. Free in your browser.

Free
Runs in your browser
No sign-up
Your data stays on your device

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

Worked example

If you enter

Value: 1
From: torr
To: mbar

You get

Result: 1.3332236842 mbar
Converted: 1.3332236842
Value pa: 133.3223684211
Factor: 1.3332236842

A vacuum pressure converter turns one absolute-pressure magnitude used in vacuum technology into another without spreadsheet tables or mental approximations of 1 torr to millibar. Enter a finite value plus a source unit and a target unit among torr, millibar, pascal, kilopascal, hectopascal, bar, micron of mercury, millitorr, millimeter of mercury, standard atmosphere, and psi; the tool returns the converted pressure, the SI intermediate in pascals, the exact unit factor applied, and step-by-step substitution lines you can paste into a process log or pump specification review. Lab technicians reading cold-cathode gauges, process engineers comparing mbar setpoints to torr recipes, students converting homework vacuum levels, and automation authors mapping PLC tags between regional unit conventions all need the same deterministic path.

Which vacuum pressure units are supported and how conversion works

This capability converts among the absolute-pressure units that dominate rough, medium, and high vacuum work in industry and teaching laboratories. The pascal (Pa) is the SI coherent unit and the internal hub: every conversion multiplies the input by how many pascals equal one source unit, then divides by how many pascals equal one target unit. Torr is defined exactly as one seven-hundred-sixtieth of a standard atmosphere, so the factor is one hundred one thousand three hundred twenty-five divided by seven hundred sixty pascals per torr.

Millimeter of mercury uses the same conventional factor as torr for vacuum practice, keeping mmHg and torr interchangeable at the precision of this tool. A micron of mercury and a millitorr are each one thousandth of a torr. Millibar equals one hundred pascals and is numerically identical to the hectopascal; bar is one hundred thousand pascals; kilopascal is one thousand pascals.

The standard atmosphere is fixed at one hundred one thousand three hundred twenty-five pascals. Psi uses the international pound-force per square inch factor. Same-unit requests succeed and return the input magnitude with a short message that no change of unit was required.

Practical tips, limits, and when to use this landing

Prefer sending bare numbers for value when you control the client; string numbers are accepted only when they match a strict finite numeric pattern without currency symbols or thousand separators. Round-trip checks are straightforward: convert A to B and B back to A and confirm you recover the original within the published twelve-decimal rounding. When teaching vacuum scales, pair classic examples such as one torr to about one point three three three millibar, one thousand micron to one torr, and one atmosphere to seven hundred sixty torr.

Stay inside the absolute range so intermediate pascal values cannot overflow. This landing targets people searching for a vacuum pressure converter, torr to millibar, pascal to torr, micron of mercury converter, or mtorr to Pa online; it is not a general multi-quantity unit converter, not a pump-down time calculator, not a conductance or leak-rate tool, and not a gauge-type selector.

What you can do with it

Gauge and recipe unit translation

Process and lab teams convert torr setpoints to mbar or Pa so multi-vendor gauges, SCADA tags, and written recipes share one absolute scale.

Micron and millitorr high-vacuum logs

Technicians convert micron-of-mercury or mtorr readings into torr or pascals for equipment logs, vendor specs, and audit trails.

Homework and training checks

Students convert torr, mbar, and Pa vacuum homework values with deterministic steps they can compare against hand calculations before submission.

FAQ

Is 1 torr the same as 1 mmHg here?

Yes for this vacuum converter: both use the exact factor 101325/760 pascals, matching common vacuum-lab convention.

How many microns equal one torr?

Exactly 1000. A micron of mercury and a millitorr are each one thousandth of a torr.

Is the vacuum pressure converter free?

The browser tool is free and runs locally.

How many millibar is 1 torr?

1 torr is 1.333223684211 mbar. A torr is 101325/760 pascals, about 133.322368421053 Pa, and a millibar is 100 Pa, so the factor follows directly from those definitions.

Is a millibar the same as a hectopascal?

Yes. Both equal 100 pascals, so a reading in mbar keeps exactly the same number in hPa. A kilopascal is 1000 pascals, which makes it ten times larger than either.

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

POSThttps://api.kit.forhosting.com/conv/vacuum

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/vacuum \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"value":1,"from":"torr","to":"mbar"}'

const res = await fetch("https://api.kit.forhosting.com/conv/vacuum", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "value": 1,
    "from": "torr",
    "to": "mbar"
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/conv/vacuum",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "value": 1,
    "from": "torr",
    "to": "mbar"
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/conv/vacuum", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"value":1,"from":"torr","to":"mbar"}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"value":1,"from":"torr","to":"mbar"}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/conv/vacuum", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "value": 1,
  "from": "torr",
  "to": "mbar"
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "conv.vacuum",
  "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 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

Unknown unit names fail with a clear invalid_input error instead of silent wrong factors.

Which vacuum pressure units are supported and how conversion works

Common aliases are accepted case-insensitively for most names: millibar and mbar, micron and micron hg, millitorr and mtorr, pascal and Pa, atmosphere and atm. If the name is not on that list the solver rejects the request with invalid_input naming the bad field and listing supported units, so clients never guess whether a typo produced a wrong number. Negative values are allowed for signed pressure-difference contexts when a client still wants the same absolute-unit factors; absolute magnitude must stay within the published one-trillion limit so intermediate products remain finite in IEEE double precision on the Worker and in the browser.

How to call the API and read the response

Value must be a finite number or a strict numeric string within absolute limits of one trillion. Wire this into dashboards, mobile clients, or batch jobs that already hold a vacuum reading and only need a second unit for display, recipe translation, or regulatory comparison without shipping floating conversion tables in every app binary. Send a JSON body with three required fields: value (aliases pressure, amount, and p), from (aliases from_unit, unit_from, and source), and to (aliases to_unit, unit_to, and target). From and to must resolve to supported unit names after alias normalization. On success the response echoes the rounded input value, canonical from and to labels, result and converted set to the same rounded target magnitude, value_pa as the SI intermediate in pascals, unit as the target label, factor as the from-to multiplier, formula as the short equation string, message as an English summary, steps as ordered substitution lines, and supported_units as the full list of canonical identifiers. Failed validation—missing fields, non-finite numbers, values outside absolute limits, or an unknown unit name—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, limits, and when to use this landing

Normalize display labels on your side if you need locale-specific spellings—this API always returns short canonical tokens such as torr, mbar, Pa, micron, and mtorr so automated tests stay stable. Prefer this capability when both endpoints are among the supported absolute vacuum pressure units and you need deterministic exact factors and step strings; if you need gas-law P-V-T solves or Boyle final pressure from volume ratios, use the dedicated chemistry and thermo calculators instead. Failed tasks that return invalid_input do not consume prepaid balance, which keeps exploratory scripts cheap when clients deliberately probe unknown unit names.

Technical questions

Which vacuum pressure units can I convert?

Pa, kPa, hPa, mbar, bar, torr, mmHg, micron, mtorr, atm, and psi, including common full-word aliases such as millibar, millitorr, and atmosphere.

What happens if I send an unknown unit name?

The API returns invalid_input, names the bad field, and lists the supported units. The failed task is not charged.

Read the full KIT documentation →

Run — free

Worked example

Which vacuum pressure units are supported and how conversion works

Practical tips, limits, and when to use this landing

What you can do with it

Gauge and recipe unit translation

Micron and millitorr high-vacuum logs

Homework and training checks

FAQ

Related tools

For developers — API access

API endpoint

Call it from your stack

Example request

Example response

Pricing

Limits

Errors

Technical notes

Which vacuum pressure units are supported and how conversion works

How to call the API and read the response

Practical tips, limits, and when to use this landing

Technical questions

thank you