PSI to Millipascals Converter
Enter the pressure in psi below to convert it to millipascals.
Convert PSI to Millipascals
Enter a value in psi (psi) to convert to millipascals (mPa).
Pounds per Square Inch to Millipascal Conversion Table
Table showing various pounds per square inch measurements converted to millipascals. Click any preset value or arrow to load it into the converter.
| PSI (psi) | Millipascals (mPa) |
|---|---|
| 0.0000001 psi | 0.6894757 mPa |
| 0.0000002 psi | 1.3789515 mPa |
| 0.0000003 psi | 2.0684272 mPa |
| 0.0000004 psi | 2.7579029 mPa |
| 0.0000005 psi | 3.4473786 mPa |
| 0.0000006 psi | 4.1368544 mPa |
| 0.0000007 psi | 4.8263301 mPa |
| 0.0000008 psi | 5.5158058 mPa |
| 0.0000009 psi | 6.2052816 mPa |
| 0.00000001 psi | 0.0689476 mPa |
How to Convert PSI to Millipascals
To convert psi to millipascals, multiply the pressure by the following conversion ratio: 6,894,757.293168 millipascals/pounds per square inch.
Since one pounds per square inch is equal to 6,894,757.293168 millipascals, you can use this simple formula to convert:
The pressure in millipascals is equal to the pressure in psi multiplied by 6,894,757.293168.
For example, here's how to convert 5 psi to millipascals using the formula above.
How Many Millipascals Are in a Pounds per Square Inch?
There are 6,894,757.293168 millipascals in a pounds per square inch, which is why we use this value in the formula above.
Our pounds per square inch to millipascal calculator automatically converts your pressure measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
PSI and millipascals are both units used to measure pressure. Keep reading to learn more about each unit.
What Is a Pounds per Square Inch?
A pounds per square inch is a unit of pressure equal to 6,894.7572932 pascals (Pa), the base unit for pressure. Imperial & US pressure unit equal to 1 pound-force per square inch (6.89476 kPa). [1]
The pounds per square inch is classified as a US customary and imperial unit of pressure. PSI can be abbreviated as psi; for example, 1 pounds per square inch can be written as 1 psi.
When working with psi (psi) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, psi (psi) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is a Millipascal?
A millipascal is a unit of pressure equal to 1/1,000 of a pascal (0.001 Pa). One-thousandth of a Pascal. [2]
The millipascal is classified as a metric and SI-compatible unit of pressure. Millipascals can be abbreviated as mPa; for example, 1 millipascal can be written as 1 mPa.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millipascal (mPa) a convenient decimal multiple of the pascal (Pa).
In practice, millipascals (mPa) are widely used across fine-tolerance laboratory, analytical, and micro-scale pressure measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting pressure between psi (psi) and millipascals (mPa), keep full floating-point precision (1 psi = 6,894,757.293168 mPa; 1 mPa = 0.000000145 psi) during intermediate calculations and round only the final millipascal figure to match your instrument tolerance.
More Pounds per Square Inch & Millipascal Conversions
Need to calculate in the opposite direction? Use our millipascals to psi calculator to switch your starting unit immediately. You can also explore related tools such as converting millipascals to psi, converting psi to bars, or converting psi to kilopascals.
Convert from PSI
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Pressure & Stress))·Pressure Metrology Standard — PSI (psi) to Millipascals (mPa)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Pascal (Pa))·Unit Specifications: Pounds per Square Inch (psi) & Millipascal (mPa)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Mechanics)·Conversion Factors & Mathematical Basis (psi to mPa)