MPa conversion
Enter one megapascal value and get psi, bar and kilopascals together: 1 MPa is 145.037737730209 psi, 10 bar and 1000 kPa. Exact definitions, not the 145 rule of thumb. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Mpa
- 1
- Psi
- 145.0377377302
- Bar
- 10
- Kpa
- 1,000
- Psi per mpa
- 145.0377377302
Turning a compact SI megapascal reading into the three pressure units that still dominate datasheets is a daily chore whenever material tables, hydraulic benches, and process sheets refuse to share one system. This MPa conversion calculator takes one finite megapascal value and returns pounds per square inch, bar, and kilopascals in a single response. The arithmetic follows exact identities: one megapascal is one million pascals, ten bar, and one thousand kilopascals, while psi uses the international pound-force and inch definitions.
The three exact MPa factors and why they never drift
The megapascal is the compact SI pressure unit that material tables, hydraulic cylinders, rock-mechanics reports, and high-pressure process sheets actually print. One megapascal is defined as exactly one million pascals, ten to the sixth power, so it sits cleanly next to the SI pascal without an awkward string of zeros. Bar remains the everyday European process unit: one bar is exactly one hundred thousand pascals, which makes one megapascal exactly ten bar with no rounding whatsoever.
Kilopascals remain the everyday metric unit on many tyre placards, HVAC gauges, and laboratory transducers: one kilopascal is exactly one thousand pascals, so one megapascal is exactly one thousand kilopascals. Pounds per square inch remain the everyday imperial pressure unit on United States gauges, hydraulic benches, and many equipment nameplates.
The bridge to psi is not a memorised one-hundred-forty-five rule of thumb: one megapascal is one million 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. Zero megapascals maps cleanly to zero in every listed unit.
Prefer the exact path whenever your audience will compare against engineering tables rather than mental arithmetic.
Where the psi, bar and kPa results are used
Pair the three output fields with your own reverse conversion if a pipeline must round-trip labels, but keep this page focused on converting megapascals outward into psi, bar, and kilopascals. Source inputs follow the same retention rules as other parse items: they are processed and discarded. Authors shipping SDKs can map mpa into a number field and show psi, bar, and kpa as result badges.
Keep requests small, treat non-finite megapascal values as a client bug, and you get reproducible pressures for homework, LMS plugins, and edge workers without standing up a general unit-conversion library of your own. This landing targets people searching for MPa conversion, convert megapascal to psi, or megapascal to bar and kPa; it is not a general multi-unit pressure hub, not a vacuum torr converter, and not a tyre-load calculator.
What you can do with it
Material yield and tensile tables
Materials engineers convert steel and composite strengths listed in megapascals into psi for United States datasheets, bar for European process notes, and kilopascals for mixed lab reports.
Hydraulic benches and high-pressure lines
Technicians map MPa cylinder and pump ratings into psi gauge expectations, bar process setpoints, and kPa instrumentation scales with the same exact factors every row.
FAQ
What happens if the megapascal value is not a finite number?
Missing fields, empty strings, NaN, Infinity, and non-numeric tokens cannot be converted into a pressure and are not billed.
Which conversion factors does this MPa conversion calculator use?
Psi uses 1 lbf/in² from the international pound-mass, standard gravity, and the exact inch. Classroom shortcuts such as 145 psi per MPa are not the computation constant.
Can I send the megapascal value as a numeric string?
Yes. Strict finite numeric strings, including scientific notation, are parsed.
Why not just multiply by 145 to get psi?
Because 145 is a rounded rule of thumb. One megapascal is exactly 145.037737730209 psi, derived from the international pound, standard gravity and the exact inch, which matters when you compare against engineering tables.
Can I enter a negative or gauge value?
Yes. Signed values are accepted because they are finite numbers. Whether a reading is absolute or gauge is up to you; apply that convention in your own report after converting.
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/mpa-conversion \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"mpa":1}'const res = await fetch("https://api.kit.forhosting.com/conv/mpa-conversion", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"mpa": 1
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/conv/mpa-conversion",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"mpa": 1
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/conv/mpa-conversion", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"mpa":1}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"mpa":1}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/conv/mpa-conversion", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"mpa": 1
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "conv.mpa_conversion",
"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
Missing values, empty strings, NaN, Infinity, and non-numeric tokens fail with invalid_input instead of inventing a gauge reading. Successful API calls bill at $0.002 per item; validation failures are not charged.
Input contract, aliases, and why non-finite values fail
Numeric strings, including scientific notation, are parsed; empty strings, missing fields, objects, and arrays are not. The same error is raised for a missing field, a bare plus or minus sign, and text such as a spelled-out phrase without a number. Failed validation is not billed. Use this landing when the search intent is MPa conversion as a bundle of psi, bar, and kilopascals; a dedicated kilopascal-to-psi-only tool is a different query and a different page. Signed gauge-style values are accepted because they are finite numbers; apply any absolute-versus-gauge convention in your own reporting layer after conversion. POST a JSON body with the required field mpa, a finite number representing megapascals. If the megapascal value is not a finite number the task fails with invalid_input and a message that names mpa, because NaN, Infinity, and non-numeric tokens cannot be converted into a pressure. Magnitudes above one trillion megapascals are rejected so Worker isolates stay inside a published limit. On success the JSON echoes the parsed mpa value and returns psi, bar, and kpa as three parallel numbers. Companion fields document the factors: psi_per_mpa from the SI-derived pound-force identity, bar_per_mpa ten, and kpa_per_mpa one thousand. A formula string restates the three identities in one line for tutoring interfaces, method is always exact_si_mpa so downstream code can pin the definition, and steps lists the substitution audit.
API usage, pricing, and where the three outputs land
Successful conversions bill as one item at $0.002; invalid_input never consumes balance, so you can validate forms without burning prepaid credit.
Integration use cases
Homework checks and geomechanics notes
Students, teachers, and rock-mechanics notebooks verify one megapascal-to-three-units answer with exact identities, a readable formula line, and a clear invalid_input error on non-finite input.
Technical questions
How do I convert megapascals to psi, bar, and kilopascals?
Send a finite number in the mpa field (aliases megapascals, megapascal, value, pressure, mpa_value). The API returns psi, bar, and kpa using one million pascals per MPa, ten bar per MPa, and one thousand kPa per MPa, with psi from the international pound-force and inch definitions.
What does MPa conversion cost?
The browser tool is free. API requests use prepaid KIT balance at $0.002 per successful call; invalid input is not billed.