Megapascal to Psi Converter
Enter the value that you want to convert megapascal (MPa) to psi or psi to megapascal.
1 megapascal = 145.0377377 psi
Formula: psi = megapascal value × 145.0377377
megapascal to psi
10 megapascal = 1450.37738 psi
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Megapascal to Psi: The Essentials
What is Megapascal?
Megapascal (MPa) is a unit of pressure measurement. 1 megapascal is equal to 145.0377377 psi.
What is Psi?
Psi (psi) is a unit of pressure measurement. 1 psi is equal to 0.0068948 megapascal.
Pressure Units Across Industries
Pressure measurements vary dramatically by industry. Meteorologists report in millibars or hectopascals, tire shops use PSI, scuba divers think in atmospheres or bar, vacuum engineers work in torr, and hydraulic systems specify in megapascals. A single industrial plant might encounter all these units across different equipment manuals, safety datasheets, and regulatory standards from different countries.
megapascal to psi metric conversion table
| 0.01 MPa | = | 1.45038 psi |
| 0.1 MPa | = | 14.50377 psi |
| 1 MPa | = | 145.03774 psi |
| 2 MPa | = | 290.07548 psi |
| 3 MPa | = | 435.11321 psi |
| 4 MPa | = | 580.15095 psi |
| 5 MPa | = | 725.18869 psi |
| 6 MPa | = | 870.22643 psi |
| 7 MPa | = | 1015.26416 psi |
| 8 MPa | = | 1160.30190 psi |
| 9 MPa | = | 1305.33964 psi |
| 10 MPa | = | 1450.37738 psi |
| 11 MPa | = | 1595.41512 psi |
| 12 MPa | = | 1740.45285 psi |
| 13 MPa | = | 1885.49059 psi |
| 14 MPa | = | 2030.52833 psi |
| 15 MPa | = | 2175.56607 psi |
| 16 MPa | = | 2320.60380 psi |
| 17 MPa | = | 2465.64154 psi |
| 18 MPa | = | 2610.67928 psi |
| 19 MPa | = | 2755.71702 psi |
| 20 MPa | = | 2900.75475 psi |
| 30 MPa | = | 4351.13213 psi |
| 40 MPa | = | 5801.50951 psi |
| 50 MPa | = | 7251.88689 psi |
| 60 MPa | = | 8702.26426 psi |
| 70 MPa | = | 10152.64164 psi |
| 80 MPa | = | 11603.01902 psi |
| 90 MPa | = | 13053.39640 psi |
| 100 MPa | = | 14503.77377 psi |
| 200 MPa | = | 29007.54755 psi |
| 300 MPa | = | 43511.32132 psi |
| 400 MPa | = | 58015.09509 psi |
| 500 MPa | = | 72518.86886 psi |
| 600 MPa | = | 87022.64264 psi |
| 700 MPa | = | 101526.41641 psi |
| 800 MPa | = | 116030.19018 psi |
| 900 MPa | = | 130533.96396 psi |
| 1000 MPa | = | 145037.73773 psi |
How to Convert Megapascal to Psi?
We can convert megapascal to psi by using an example.
Example:
Convert 20 Megapascal to Psi?
We know 1 Megapascal = 145.0377377 psi; 1 Psi = 0.0068948 megapascal.
20 megapascal = ___psi
20 × 145.0377377 = 2900.75475 psi (we know 1 megapascal = 145.0377377 psi)
Answer:
20 megapascal = 2900.75475 psi
How to Convert MPa to PSI (Step-by-Step)
Converting megapascals to PSI bridges international material specifications (ISO) with US standards (ASTM/AISI). The conversion factor is 1 MPa = 145.038 PSI.
- Write down the pressure or stress value in megapascals (MPa).
- Multiply the MPa value by 145.038.
- The result is the equivalent value in PSI.
- For quick estimation, multiply by 145 (undershoots by only 0.03%).
Common MPa to PSI Conversions
Material strengths and hydraulic pressures converted from international MPa to US PSI values.
| Megapascal | Psi |
|---|---|
| 1 MPa | 145 PSI |
| 20 MPa | 2901 PSI |
| 70 MPa | 10,153 PSI |
| 250 MPa | 36,260 PSI |
| 345 MPa | 50,038 PSI |
| 400 MPa | 58,015 PSI |
| 690 MPa | 100,076 PSI |
| 1000 MPa | 145,038 PSI |
Solved Examples: MPa to PSI
Question 1: A steel specification lists tensile strength as 450 MPa. What is this in PSI for a US fabricator?
Solution:
Stress in PSI = Stress in MPa × 145.038
= 450 × 145.038
= 65,267 PSI
Answer: 450 MPa = 65,267 PSI (≈ 65.3 ksi) — equivalent to ASTM A572 Grade 50 tensile.
Question 2: Concrete design strength is 35 MPa (C35). Express in PSI.
Solution:
Strength in PSI = 35 × 145.038
= 5076 PSI
Answer: 35 MPa = 5076 PSI — equivalent to US "5000 PSI" concrete mix.
Question 3: A bolt specification shows proof load 830 MPa (Grade 10.9). Convert to PSI.
Solution:
Stress in PSI = 830 × 145.038
= 120,382 PSI
Answer: 830 MPa = 120,382 PSI — comparable to SAE Grade 8 bolts (120,000 PSI proof).
Practice Questions: MPa to PSI
Try solving these on your own to test your understanding:
- Convert 500 MPa to PSI. (Answer: 72,519 PSI)
- Aluminum 6061-T6 yield is 276 MPa. Express in PSI. (Answer: 40,030 PSI)
- Convert 2068 MPa (piano wire) to PSI. (Answer: 299,899 PSI)
- A pipe is rated for 10 MPa. What is this in PSI? (Answer: 1450 PSI)
- Convert 40 MPa concrete strength to PSI. (Answer: 5802 PSI)
Comparing ISO and ASTM Steel Specifications
International steel specs use MPa while US specs use PSI (or ksi). Key equivalents: S235 (EN) = 235 MPa yield ≈ 34 ksi (close to A36); S355 (EN) = 355 MPa ≈ 51.5 ksi (close to A572-50); Grade 8.8 bolt = 640 MPa proof ≈ 92.8 ksi (between SAE Grade 5 and 8). When substituting imported steel for domestic grades, convert MPa to PSI and verify all relevant properties (yield, tensile, elongation) meet the US specification requirements.
Concrete Strength Class Equivalents
International concrete is specified in MPa (C20, C30, C40) while US concrete uses PSI (3000, 4000, 5000 PSI). Approximate equivalents: C20 = 2900 PSI, C25 = 3626 PSI, C30 = 4351 PSI, C35 = 5076 PSI, C40 = 5802 PSI, C50 = 7252 PSI. Note that testing methods (cube vs cylinder) also differ, with cube strength being ~20% higher than cylinder strength for the same concrete.
Quick Mental Math: MPa to ksi Shortcut
Since 1 MPa ≈ 145 PSI and 1 ksi = 1000 PSI, dividing MPa by 6.895 gives ksi directly. But an easier mental trick: MPa ÷ 7 ≈ ksi (overshoots by ~1.5%). So 350 MPa ÷ 7 ≈ 50 ksi — which is Grade 50 steel. This shortcut is widely used by structural engineers comparing international and US grades.
Key Takeaways
- Multiply MPa by 145.038 to get PSI.
- Quick estimate: MPa × 145 ≈ PSI (error < 0.03%).
- Key benchmark: 250 MPa ≈ 36,000 PSI ≈ 36 ksi (A36 steel).
- ISO steel grades use MPa; ASTM/AISI grades use PSI or ksi.
- Concrete: C30 (30 MPa) ≈ 4350 PSI ≈ US "4000 PSI" class.
- For MPa to ksi: divide by 6.895 or approximate as MPa ÷ 7.
Megapascal to Psi Conversion Formula
psi = megapascal × 145.0377377
1 megapascal = 145.0377377 psi
1 psi = 0.0068948 megapascal
Reverse: megapascal = psi × 0.0068948
Frequently Asked Questions
How many psi are in 1 megapascal?
There are 145.0377377 psi in 1 megapascal. To convert megapascal to psi, multiply the value by 145.0377377.
How do I convert megapascal to psi?
Multiply your megapascal value by 145.0377377 to get the equivalent in psi. For example, 5 megapascal = 5 × 145.0377377 = 725.18869 psi.
How do I convert psi to megapascal?
Multiply your psi value by 0.0068948 to get the equivalent in megapascal. Alternatively, divide by 145.0377377.
What is 10 megapascal in psi?
10 megapascal is equal to 1450.37738 psi.
What is 100 megapascal in psi?
100 megapascal is equal to 14503.77377 psi.