MPa to PSI Converter: Convert Pressure Units Instantly (Free Tool)
You have a pressure reading in megapascals (MPa). Your equipment uses PSI. Your manual uses bar. You need to convert.
Pressure units are confusing. MPa is common in engineering, materials science, and hydraulics. PSI is standard in the United States for tires, compressors, and industrial equipment.
Today, I give you a free MPa to PSI Converter.
You enter a value in MPa. The calculator shows PSI instantly. It works both ways.
The converter handles:
- MPa to PSI
- PSI to MPa
- Bar and kPa too
Let me explain what MPa and PSI are and why they matter.
What are MPa and PSI? (Simple Explanation)
MPa (Megapascal) is a metric unit of pressure. One MPa is one million pascals. It is common in engineering, materials testing, and high-pressure systems.
PSI (Pounds per Square Inch) is the US customary unit of pressure. One PSI is the pressure exerted by one pound of force on one square inch.
The relationship:
1 MPa = 145.0377 PSI
1 PSI = 0.00689476 MPa
Why This MPa to PSI Converter Matters
Here is why you need to convert between MPa and PSI.
Reason 1: Material strength
Steel and concrete strengths are often given in MPa (metric) or PSI (US). A 40 MPa concrete is about 5,800 PSI. Convert to compare.
Reason 2: Hydraulic systems
Hydraulic pumps and cylinders are rated in MPa (international) or PSI (US). A 20 MPa system is about 2,900 PSI.
Reason 3: Pressure vessels
ASME pressure vessel codes use PSI. European codes use MPa. Convert for compliance.
Reason 4: Tire pressure
Car tire pressures are in PSI (US) or bar/kPa (elsewhere). MPa is rarely used for tires, but you may need to convert.
Reason 5: Engineering specifications
International projects often require converting between MPa and PSI for consistent design.
The Formula (Very Simple)
MPa to PSI:
PSI = MPa × 145.0377
PSI to MPa:
MPa = PSI × 0.00689476
Example 1: 10 MPa to PSI
10 × 145.0377 = 1,450.38 PSI
Example 2: 100 PSI to MPa
100 × 0.00689476 = 0.6895 MPa
Example 3: 1 MPa to PSI
1 × 145.0377 = 145.04 PSI
Example 4: 1 PSI to MPa
1 × 0.00689476 = 0.00689 MPa
LIVE MPa to PSI Converter
Type in either box. The other box updates instantly. Watch the pressure meter move.
📊 MPa to PSI Converter
💪 Megapascals (MPa)
⚙️ PSI (psi)
📊 MPa to PSI Converter
Convert pressure units instantly • Works both ways
💪 Megapascals (MPa)
1 MPa = 1,000,000 Pa
⇄
⚙️ PSI (psi)
Pounds per square inch
📊 PRESSURE METER
0 MPa / 0 PSI
010 MPa20 MPa30 MPa40 MPa
Common pressures:0.1 MPa (14.5 PSI)0.7 MPa (101.5 PSI)1 MPa (145 PSI)10 MPa (1,450 PSI)20 MPa (2,901 PSI)100 MPa (14,504 PSI)
💡 1 MPa = 145.0377 PSI. 1 PSI = 0.00689476 MPa.
⚡ Concrete strength: 20-40 MPa (2,900-5,800 PSI). Hydraulic systems: 10-35 MPa (1,450-5,076 PSI).
How to Use This MPa to PSI Converter
It could not be simpler.
To convert MPa to PSI: Type a number in the Megapascals box. The PSI box updates instantly.
To convert PSI to MPa: Type a number in the PSI box. The Megapascals box updates instantly.
To swap values: Click the swap button (⇄) between the boxes.
Real Examples: Everyday Pressures
Example 1: Concrete strength
- Concrete strength: 30 MPa
- Convert to PSI: 30 × 145.0377 = 4,351 PSI
Example 2: Hydraulic system
- Hydraulic pressure: 21 MPa
- Convert to PSI: 21 × 145.0377 = 3,046 PSI
Example 3: Material yield strength
- Steel yield: 250 MPa
- Convert to PSI: 250 × 145.0377 = 36,259 PSI (about 36 ksi)
Example 4: Water jet cutter
- Water jet pressure: 400 MPa
- Convert to PSI: 400 × 145.0377 = 58,015 PSI
MPa to PSI Conversion Table
| MPa | PSI | Applications |
|---|---|---|
| 0.1 | 14.5 | Low pressure |
| 0.5 | 72.5 | Water pressure |
| 0.7 | 101.5 | Car tire (approx) |
| 1 | 145 | Light hydraulic |
| 2 | 290 | Moderate pressure |
| 5 | 725 | Industrial |
| 10 | 1,450 | High pressure |
| 15 | 2,176 | Hydraulic systems |
| 20 | 2,901 | Heavy hydraulic |
| 25 | 3,626 | Concrete (high strength) |
| 30 | 4,351 | Concrete (high strength) |
| 40 | 5,802 | Structural steel |
| 50 | 7,252 | Tool steel |
| 60 | 8,702 | Very high pressure |
| 80 | 11,603 | Extreme pressure |
| 100 | 14,504 | Ultra-high pressure |
| 200 | 29,008 | Rare |
| 400 | 58,015 | Water jet cutting |
| 1,000 | 145,038 | Diamond anvil |
MPa vs. PSI: Which is Better?
MPa advantages:
- Metric system (consistent with other units)
- Used internationally
- Smaller numbers for typical engineering pressures (20 MPa vs 2,900 PSI)
PSI advantages:
- Familiar to US engineers and technicians
- More granular (can use whole numbers for many applications)
- Common in US codes (ASME, API)
Verdict: Use what your industry uses. But convert as needed.
Concrete Strength Grades
| Grade | MPa | PSI | Use |
|---|---|---|---|
| C20 | 20 | 2,900 | Lightweight, non-structural |
| C25 | 25 | 3,625 | Residential foundations |
| C30 | 30 | 4,350 | Driveways, slabs |
| C35 | 35 | 5,075 | Commercial buildings |
| C40 | 40 | 5,800 | Industrial floors |
| C50 | 50 | 7,250 | High-strength columns |
Steel Strength Grades
| Grade | MPa | PSI | Use |
|---|---|---|---|
| A36 | 250 | 36,000 | Structural steel |
| Grade 50 | 345 | 50,000 | High-strength structural |
| Grade 60 | 415 | 60,000 | Rebar |
| Grade 80 | 550 | 80,000 | High-strength rebar |
| Tool steel | 1,000+ | 145,000+ | Tools, dies |
Hydraulic System Pressures
| System Type | MPa | PSI |
|---|---|---|
| Low-pressure hydraulics | 7-10 | 1,000-1,500 |
| Medium-pressure hydraulics | 14-21 | 2,000-3,000 |
| High-pressure hydraulics | 28-35 | 4,000-5,000 |
| Very high-pressure hydraulics | 35-70 | 5,000-10,000 |
| Ultra-high-pressure hydraulics | 70-140 | 10,000-20,000 |
Tire Pressures
| Vehicle | Typical PSI | Typical MPa |
|---|---|---|
| Car | 30-35 | 0.21-0.24 |
| Truck | 50-80 | 0.34-0.55 |
| Bicycle | 40-100 | 0.28-0.69 |
| Heavy equipment | 100-150 | 0.69-1.03 |
Kilopascals (kPa) and Bars
MPa is large. For smaller pressures, use kPa (kilopascals) or bar.
Relationships:
1 MPa = 1,000 kPa
1 MPa = 10 bar
1 bar = 100 kPa = 0.1 MPa
Examples:
- 0.1 MPa = 100 kPa = 1 bar = 14.5 PSI
- Car tire: 0.22 MPa = 220 kPa = 2.2 bar = 32 PSI
Quick Mental Conversion Tricks
MPa to PSI (rough):
Multiply by 145 (accurate enough for most work)
Example: 10 × 145 = 1,450 PSI (actual: 1,450.38)
PSI to MPa (rough):
Divide by 145
Example: 1,450 ÷ 145 = 10 MPa (actual: 10.00)
The 100 MPa = 14,500 PSI rule:
100 MPa is about 14,500 PSI. Good for order-of-magnitude estimates.
Frequently Asked Questions (FAQs)
1. How many PSI is 1 MPa?
145.0377 PSI.
2. How many MPa is 1 PSI?
0.00689476 MPa.
3. What is 10 MPa in PSI?
1,450.38 PSI.
4. What is 100 PSI in MPa?
0.6895 MPa.
5. How do you convert MPa to PSI quickly?
Multiply by 145 (or 145.04 for precision).
6. What is the difference between MPa and PSI?
MPa is metric (pascals). PSI is US customary (pounds per square inch).
7. What is MPa used for?
Concrete strength, steel strength, hydraulic pressure, material science.
8. What is PSI used for?
Tire pressure, air compressors, hydraulic systems in the US, plumbing.
9. Is MPa a large unit?
Yes. 1 MPa is about 10 times atmospheric pressure (0.1 MPa ≈ 1 bar).
10. What is the MPa of atmospheric pressure?
0.101325 MPa (about 0.1 MPa).
Common Mistakes
Mistake #1: Using 145 instead of 145.0377
For most purposes, 145 is fine. For precision engineering, use 145.0377.
Mistake #2: Confusing MPa with kPa
1 MPa = 1,000 kPa. Do not mix them.
Mistake #3: Forgetting to convert units in formulas
If a formula expects PSI, convert MPa first.
Mistake #4: Assuming 1 MPa = 1 bar
1 MPa = 10 bar. 0.1 MPa = 1 bar.
Mistake #5: Rounding too early
Keep several decimal places until the final step.
Pressure in Different Fields
Civil engineering:
- Concrete: 20-50 MPa
- Soil bearing: 0.1-0.5 MPa
- Wind pressure: 0.001-0.005 MPa
Mechanical engineering:
- Hydraulic systems: 10-35 MPa
- Pneumatic systems: 0.5-1.0 MPa
- Boiler pressure: 1-10 MPa
Materials science:
- Steel yield: 200-1,000 MPa
- Aluminum yield: 100-500 MPa
- Ceramic strength: 100-1,000 MPa
Oil and gas:
- Pipeline pressure: 5-15 MPa
- Wellhead pressure: 20-100 MPa
The Origin of the Pascal
The pascal (Pa) is named after Blaise Pascal (1623-1662), a French mathematician, physicist, and philosopher.
1 Pa = 1 N/m². It is a small unit. Atmospheric pressure is 101,325 Pa.
Prefixes:
- kPa = 1,000 Pa
- MPa = 1,000,000 Pa
- GPa = 1,000,000,000 Pa
The Origin of PSI
PSI stands for “pounds per square inch.” It originated from the British imperial system.
1 PSI = the pressure exerted by 1 pound-force on 1 square inch.
PSI is widely used in the United States for:
- Tire pressure
- Air compressors
- Hydraulic systems
- Water pressure
- Gas pressure
Final Thoughts
Converting between MPa and PSI is essential for international engineering.
My MPa to PSI Converter gives you:
- Instant conversion both ways
- Visual pressure meter
- Common pressure presets
Bookmark this page. Use it for concrete design, hydraulic systems, and material specifications.
The next time someone asks “How many PSI is 30 MPa?”, you will know. 4,351 PSI.
Disclaimer: This is an educational tool. For critical engineering, use exact conversions and calibrated instruments.
External Links (Authority Backlinks):
- Wikipedia – Pascal (unit){:target=”_blank” rel=”noopener noreferrer”}
- Wikipedia – Pounds per square inch{:target=”_blank” rel=”noopener noreferrer”}
- Wikipedia – Pressure{:target=”_blank” rel=”noopener noreferrer”}
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