PSI to MPa Converter
Convert pounds per square inch to megapascals — 145.04 psi make one MPa. Results update as you type; exact factors shown.
One pound per square inch is 0.0069 megapascals — see the exact factor, not a rounded rule of thumb.
How the psi to mpa converter works
Pressures convert through the pascal (1 N/m²). One bar is exactly 100 kPa; a standard atmosphere is exactly 101.325 kPa; 1 psi is 6.894757 kPa (a pound-force on a square inch); 1 mmHg is 133.322 Pa by the conventional definition.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common pressure conversions
| From | To | Units |
|---|---|---|
| 100 psi | 0.6895 MPa | pounds per square inch to megapascals |
| 500 psi | 3.4474 MPa | pounds per square inch to megapascals |
| 1,000 psi | 6.8948 MPa | pounds per square inch to megapascals |
| 1,450 psi | 9.9974 MPa | pounds per square inch to megapascals |
| 2,000 psi | 13.7895 MPa | pounds per square inch to megapascals |
| 3,000 psi | 20.6843 MPa | pounds per square inch to megapascals |
| 4,000 psi | 27.579 MPa | pounds per square inch to megapascals |
| 5,000 psi | 34.4738 MPa | pounds per square inch to megapascals |
| 6,000 psi | 41.3685 MPa | pounds per square inch to megapascals |
| 8,000 psi | 55.1581 MPa | pounds per square inch to megapascals |
| 10,000 psi | 68.9476 MPa | pounds per square inch to megapascals |
| 20,000 psi | 137.8951 MPa | pounds per square inch to megapascals |
Units in this converter and their exact factors
| Unit | Symbol | One unit in pascals |
|---|---|---|
| pascal | Pa | 1 pascal |
| kilopascal | kPa | 1,000 pascal |
| megapascal | MPa | 1,000,000 pascal |
| bar | bar | 100,000 pascal |
| millibar (hectopascal) | mbar | 100 pascal |
| standard atmosphere | atm | 101,325 pascal |
| pound per square inch | psi | 6,894.757293168 pascal |
| millimetre of mercury | mmHg | 133.322387415 pascal |
| inch of mercury | inHg | 3,386.389 pascal |
FAQFrequently asked questions about pressure conversion
How many MPa is 1,000 psi?
6.895 MPa.
What concrete grade is 4,000 psi?
About 27.6 MPa.
Why do engineers prefer MPa?
It is SI, and material properties are published in it almost everywhere outside the US.
What is 3,000 psi in MPa?
20.7 MPa — a common hydraulic system pressure.
What is 1 psi in Pa?
6,894.76 Pa.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.