MPa to PSI Converter is a free online tool that instantly converts pressure values between Megapascals (MPa) and Pounds per Square Inch (PSI).
Whether you’re working in hydraulics, automotive, HVAC, or industrial applications, this converter provides accurate results with additional conversions to bar, kPa, and atmospheres. Enter your pressure value and get instant, precise conversions for all your engineering and technical needs.
MPa to PSI Converter | Free Pressure Unit Calculator
MPa
Metric pressure unit
PSI
Imperial pressure unit
Conversion Result
145.04
PSI
1 MPa × 145.038 = 145.04 PSI
Bar
10.00
bar
Kilopascals
1,000
kPa
Atmospheres
9.87
atm
kg/cm²
10.20
kg/cm²
Pascals
1,000,000
Pa
Torr
7,501
Torr
📝 Conversion Formulas
PSI = MPa × 145.038 | MPa = PSI ÷ 145.038
📖 How to Use This Converter
1
Enter Value
Type pressure in MPa or use quick presets
2
View Results
Get instant PSI and other unit conversions
3
Swap Units
Click swap to convert PSI to MPa instead
4
Copy & Use
Copy results for your projects
⚖️ Understanding MPa and PSI
📊 MPa (Megapascal)
Full NameMegapascal
SystemSI (Metric)
Base Unit1,000,000 Pa
Equivalent1 N/mm²
Common UseEngineering
RegionsWorldwide (metric)
🔧 PSI (Pounds/Sq Inch)
Full NamePounds per Square Inch
SystemImperial/US
Definition1 lb force / 1 in²
Equivalent6,894.76 Pa
Common UseAutomotive, HVAC
RegionsUSA, UK (partial)
🔧 Common Pressure Applications
🚗 Automotive
Tire pressure0.2-0.35 MPa
Fuel injection3-20 MPa
Brake system10-20 MPa
Turbo boost0.07-0.21 MPa
⚙️ Hydraulics
Light duty7-14 MPa
Medium duty14-21 MPa
Heavy duty21-35 MPa
Ultra-high35-100+ MPa
❄️ HVAC
Low side0.2-0.4 MPa
High side1.0-2.5 MPa
Air compressor0.7-1.0 MPa
Pressure washer7-28 MPa
🏗️ Construction
Concrete strength20-40 MPa
Steel yield250-500 MPa
Water mains0.3-0.5 MPa
Gas lines0.02-0.07 MPa
📊 Quick Conversion Reference
MPa
PSI
Bar
kPa
0.1
14.50
1.00
100
0.25
36.26
2.50
250
0.5
72.52
5.00
500
1
145.04
10.00
1,000
2
290.08
20.00
2,000
5
725.19
50.00
5,000
10
1,450.38
100.00
10,000
20
2,900.76
200.00
20,000
50
7,251.89
500.00
50,000
100
14,503.77
1,000.00
100,000
PSI
MPa
Bar
kPa
10
0.069
0.69
69
25
0.172
1.72
172
50
0.345
3.45
345
100
0.689
6.89
689
250
1.724
17.24
1,724
500
3.447
34.47
3,447
1,000
6.895
68.95
6,895
2,500
17.237
172.37
17,237
5,000
34.474
344.74
34,474
10,000
68.948
689.48
68,948
📏 Key Conversion Factor
The fundamental relationship is: 1 MPa = 145.038 PSI. For quick mental math, remember that 1 MPa is approximately 145 PSI. Also useful: 1 MPa = 10 bar exactly.
🌡️ Atmospheric Pressure
Standard atmospheric pressure at sea level is 0.101325 MPa or 14.696 PSI (often rounded to 14.7 PSI or 0.1 MPa). This is used as a reference point in many pressure measurements.
⚠️ Safety Note
When working with high-pressure systems, always verify your unit conversions. Incorrect pressure readings can lead to equipment failure or safety hazards. Double-check critical calculations.
❓ Frequently Asked Questions
How many PSI is 1 MPa?
1 MPa equals 145.038 PSI. This conversion factor is derived from the relationship between metric and imperial units of force and area. For quick estimates, you can round to 145 PSI per MPa.
How do I convert MPa to PSI manually?
Multiply the MPa value by 145.038 to get PSI. For example, 2 MPa × 145.038 = 290.08 PSI. For a quick estimate, simply multiply MPa by 145.
How do I convert PSI to MPa?
Divide the PSI value by 145.038, or multiply by 0.00689476. For example, 100 PSI ÷ 145.038 = 0.689 MPa. Use the swap button in our calculator for easy reverse conversion.
What is the difference between MPa and kPa?
MPa (Megapascal) is 1,000 times larger than kPa (Kilopascal). 1 MPa = 1,000 kPa. MPa is used for higher pressures like hydraulic systems, while kPa is common for lower pressures like atmospheric pressure or tire pressure specifications in some regions.
What is normal tire pressure in MPa?
Normal car tire pressure is typically 0.22-0.25 MPa (32-36 PSI). However, always check your vehicle’s specifications on the door jamb sticker, as recommended pressure varies by vehicle and tire type.
What is the relationship between MPa and bar?
1 MPa = 10 bar exactly. This makes conversion between these units very simple – just multiply or divide by 10. Bar is commonly used in Europe for tire pressure and industrial applications.
Is MPa the same as N/mm²?
Yes, 1 MPa = 1 N/mm² (Newton per square millimeter). This equivalence is particularly useful in material science and structural engineering when specifying material strength properties.
What is atmospheric pressure in MPa and PSI?
Standard atmospheric pressure at sea level is approximately 0.101325 MPa or 14.696 PSI (commonly rounded to 14.7 PSI or 0.1 MPa). This is also equal to 1 atmosphere (atm) or 1.01325 bar.
What pressure units do hydraulic systems use?
Hydraulic systems commonly use both MPa and PSI depending on the region. In metric countries, MPa is standard, while in the US, PSI is more common. High-pressure hydraulic systems typically operate at 10-40 MPa (1,450-5,800 PSI).
How do I convert MPa to kg/cm²?
Multiply MPa by 10.197 to get kg/cm² (kilogram-force per square centimeter). For example, 1 MPa = 10.197 kg/cm². This unit is still used in some Asian countries and older specifications.