Megapascal to PSI Converter
Convert pressure between megapascals (MPa) and pounds per square inch (PSI) with precision
Quick Conversions
Conversion Formula
PSI to MPa: MPa = PSI × 0.00689475729
The megapascal (MPa) is a metric unit of pressure equal to 1,000,000 pascals. The pound per square inch (PSI) is an imperial unit commonly used in the United States for measuring pressure in various applications including tire pressure, hydraulic systems, and material strength testing.
Conversion Examples
Example 1: Converting 15 MPa to PSI
Step 1: Start with the value in megapascals: 15 MPa
Step 2: Multiply by the conversion factor: 15 × 145.03773773
Step 3: Calculate the result: 2,175.566 PSI
Example 2: Converting 500 PSI to MPa
Step 1: Start with the value in PSI: 500 PSI
Step 2: Multiply by the conversion factor: 500 × 0.00689475729
Step 3: Calculate the result: 3.447 MPa
Example 3: Converting 22 MPa to PSI
Step 1: Start with the value in megapascals: 22 MPa
Step 2: Apply the conversion formula: 22 × 145.03773773
Step 3: Result: 3,190.830 PSI
Megapascal to PSI Conversion Table
| Megapascal (MPa) | PSI (pounds per square inch) |
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Common Pressure Conversions
Related Pressure Units
Convert megapascals to other pressure units:
About Megapascals and PSI
What is a Megapascal (MPa)?
The megapascal is a unit of pressure in the metric system, representing one million pascals. Named after French mathematician Blaise Pascal, it is widely used in engineering and material science to measure tensile strength, compressive strength, and elastic modulus. In everyday applications, megapascals are commonly used to express the pressure ratings of hydraulic systems, gas cylinders, and structural materials.
What is PSI?
Pounds per square inch (PSI) is an imperial unit of pressure that measures force applied over an area. Widely used in the United States, PSI is the standard unit for tire pressure, scuba tank pressure, and various industrial applications. The “pound” refers to pound-force, not pound-mass, making it a unit of force per unit area.
Applications of Pressure Measurement
Pressure conversions between MPa and PSI are essential in multiple industries:
Automotive Industry: Tire pressure specifications, hydraulic brake systems, and engine compression testing require accurate pressure measurements. While tire pressure is typically measured in PSI in the US, European specifications often use bar or kPa, necessitating conversions.
Manufacturing and Materials: Material strength testing, including tensile and compressive strength, is often specified in MPa. Engineers working with international standards must convert between MPa and PSI regularly.
Oil and Gas: Wellhead pressures, pipeline specifications, and equipment ratings may be expressed in either unit depending on the region and standards followed.
Aerospace: Cabin pressure, hydraulic systems, and structural load testing all require precise pressure measurements and conversions.
Frequently Asked Questions
How many PSI are in 1 MPa?
One megapascal (1 MPa) equals exactly 145.03773773 pounds per square inch (PSI). This conversion factor is derived from the relationship between metric and imperial units of force and area.
How do you convert MPa to PSI?
To convert megapascals to PSI, multiply the MPa value by 145.03773773. For example, 10 MPa × 145.03773773 = 1,450.38 PSI. This conversion is constant and applies to all pressure measurements.
Which is bigger, MPa or PSI?
One megapascal is significantly larger than one PSI. Specifically, 1 MPa equals approximately 145 PSI. Therefore, when converting from MPa to PSI, the numerical value increases substantially.
What is 100 PSI in MPa?
100 PSI equals approximately 0.689 MPa. To calculate this, multiply 100 by the conversion factor 0.00689475729, resulting in 0.6894757 MPa.
What is 200 MPa in PSI?
200 MPa equals 29,007.55 PSI. This is calculated by multiplying 200 by the conversion factor 145.03773773. This pressure level is common in high-strength materials and industrial hydraulic systems.
Why are there different pressure units?
Different pressure units exist due to historical development of measurement systems. The metric system uses pascals and its multiples (kPa, MPa), while the imperial system uses PSI. International trade and engineering collaboration require conversions between these systems.
Is MPa the same as N/mm²?
Yes, 1 MPa is exactly equal to 1 N/mm² (newton per square millimeter). This equivalence makes MPa particularly useful in engineering contexts where stress and pressure calculations involve millimeter dimensions.
What pressure unit is used for tire pressure?
Tire pressure is commonly measured in PSI in the United States, while many other countries use bar or kPa. Typical car tire pressures range from 30-35 PSI (approximately 2.1-2.4 bar or 207-241 kPa or 0.21-0.24 MPa).
References
- National Institute of Standards and Technology (NIST). Guide for the Use of the International System of Units (SI). Special Publication 811, 2008.
- International Organization for Standardization (ISO). ISO 80000-4:2019 – Quantities and units — Part 4: Mechanics.
- Bureau International des Poids et Mesures (BIPM). The International System of Units (SI), 9th edition, 2019.
- American Society of Mechanical Engineers (ASME). Pressure Vessel Code, Section II – Materials, 2021 edition.