PSI to MPa Converter: Convert Pounds per Square Inch to Megapascal
Convert psi to MPa easily with this accurate and simple tool. Perfect for engineers, mechanics, and technicians working with pressure systems.
Understanding the Conversion from PSI to MPa
Pressure is a fundamental concept in physics, engineering, fluid mechanics, and industrial operations. Pounds per square inch (psi) is a widely used imperial unit in the United States, while the megapascal (MPa) is the metric unit used internationally and especially in scientific and engineering contexts. If you're working across international borders or reading datasheets from different regions, converting between psi and MPa is essential.
What Is PSI?
PSI stands for "pounds per square inch" and is a unit that expresses pressure as a force of one pound-force applied over one square inch. It is most common in the United States and countries using the imperial system. Applications include measuring tire pressures, hydraulic pressure, water pressure in plumbing, and gas cylinder pressures.
What Is MPa (Megapascal)?
The megapascal (MPa) is a metric unit of pressure and is equal to one million pascals (Pa). A pascal is defined as one newton per square meter (N/m²). The MPa is commonly used in high-pressure systems such as hydraulic systems, structural stress testing, and material sciences, especially in countries that use the International System of Units (SI).
Conversion Formula
MPa = psi × 0.00689476
Example: 1000 psi × 0.00689476 = 6.89476 MPaPSI to MPa Conversion Table
| PSI | MPa |
|---|---|
| 100 | 0.689 |
| 500 | 3.447 |
| 1000 | 6.895 |
| 2000 | 13.790 |
| 3000 | 20.684 |
| 5000 | 34.474 |
| 10000 | 68.948 |
Why Convert PSI to MPa?
- International Projects: U.S.-based engineers may receive specifications in MPa, requiring conversion from familiar psi units.
- High-Pressure Systems: MPa is the preferred unit in hydraulic, mechanical, and structural engineering for handling large values compactly.
- Material Testing: Mechanical stress and strength data are often expressed in MPa in scientific journals and product manuals.
- Technical Documentation: Engineering documentation and global manufacturing standards rely on MPa as the pressure unit.
PSI vs MPa: How Do They Compare?
| Aspect | PSI | MPa |
|---|---|---|
| Measurement System | Imperial (US) | Metric (SI) |
| 1 unit equals | 6,894.76 Pa | 1,000,000 Pa |
| Common Use | Automotive, HVAC, U.S. industry | Engineering, hydraulics, international standards |
| Relative Scale | Smaller Unit | Higher Unit |
FAQ: PSI to MPa
How many MPa in 1 psi?
There are approximately 0.00689476 MPa in 1 psi.
Why do engineers prefer MPa?
Because it’s part of the SI system, MPa provides a clean, scalable unit for high-pressure systems without needing scientific notation or large numbers of digits.
Can I use this converter for liquid and gas pressure?
Yes, the conversion applies regardless of whether the pressure is measured in a liquid, gas, or atmospheric context.
Is MPa used in vehicle manuals?
In many international manuals, yes. Tire pressures are often in kPa or MPa for commercial and heavy-duty vehicles.
How accurate is this conversion?
It uses the exact factor of 0.00689476 MPa per psi and is accurate to five decimal places, suitable for most technical applications.
Real-World Applications for PSI to MPa Conversion
- Hydraulic systems operating in the 10–30 MPa range (≈1450–4350 psi)
- Stress testing of metals and structural materials
- Pressure sensors and controllers calibrated in MPa
- Engineering analysis and simulations using SI units
Conclusion
For engineers, technicians, and researchers working with global standards, converting psi to MPa is essential for precision and interoperability. Whether you're calibrating hydraulic systems, working with international clients, or interpreting mechanical strength ratings, this converter provides an efficient and accurate tool to bridge the gap between imperial and metric pressure units. Save this page as a go-to utility for high-pressure engineering work.