Psi to Megapascal Converter

Enter the value that you want to convert psi to megapascal (MPa) or megapascal to psi.

1 psi = 0.0068948 megapascal

Formula: megapascal = psi value × 0.0068948

psi to megapascal

Value

psi

Result

0.06895MPa

10 psi = 0.06895 megapascal

Popular Pressure Converters:

bar to psi psi to bar psi to kpa kpa to psi

Psi to Megapascal: The Essentials

What is Psi?

Psi (psi) is a unit of pressure measurement. 1 psi is equal to 0.0068948 megapascal.

What is Megapascal?

Megapascal (MPa) is a unit of pressure measurement. 1 megapascal is equal to 145.0377377 psi.

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.

psi to megapascal metric conversion table

0.01 psi	=	0.00007 MPa
0.1 psi	=	0.00069 MPa
1 psi	=	0.00689 MPa
2 psi	=	0.01379 MPa
3 psi	=	0.02068 MPa
4 psi	=	0.02758 MPa
5 psi	=	0.03447 MPa
6 psi	=	0.04137 MPa
7 psi	=	0.04826 MPa
8 psi	=	0.05516 MPa
9 psi	=	0.06205 MPa
10 psi	=	0.06895 MPa
11 psi	=	0.07584 MPa
12 psi	=	0.08274 MPa
13 psi	=	0.08963 MPa
14 psi	=	0.09653 MPa
15 psi	=	0.10342 MPa
16 psi	=	0.11032 MPa
17 psi	=	0.11721 MPa
18 psi	=	0.12411 MPa

19 psi	=	0.13100 MPa
20 psi	=	0.13790 MPa
30 psi	=	0.20684 MPa
40 psi	=	0.27579 MPa
50 psi	=	0.34474 MPa
60 psi	=	0.41369 MPa
70 psi	=	0.48263 MPa
80 psi	=	0.55158 MPa
90 psi	=	0.62053 MPa
100 psi	=	0.68948 MPa
200 psi	=	1.37895 MPa
300 psi	=	2.06843 MPa
400 psi	=	2.75790 MPa
500 psi	=	3.44738 MPa
600 psi	=	4.13685 MPa
700 psi	=	4.82633 MPa
800 psi	=	5.51581 MPa
900 psi	=	6.20528 MPa
1000 psi	=	6.89476 MPa

How to Convert Psi to Megapascal?

We can convert psi to megapascal by using an example.

Example:

Convert 20 Psi to Megapascal?

We know 1 Psi = 0.0068948 megapascal; 1 Megapascal = 145.0377377 psi.

20 psi = ___MPa

20 × 0.0068948 = 0.13790 MPa (we know 1 psi = 0.0068948 megapascal)

Answer:

20 psi = 0.13790 megapascal

How to Convert PSI to MPa (Step-by-Step)

Converting PSI to megapascals (MPa) bridges American pressure measurements with international material specifications (ISO, Eurocode, AS/NZS). The conversion factor is 1 PSI = 0.00689476 MPa.

Write down the pressure or stress value in PSI.
Multiply the PSI value by 0.00689476.
The result is the equivalent stress/pressure in MPa.
Alternatively, divide PSI by 145.038 for the same result.

💡 Tip: Quick mental math: divide PSI by 145. For structural steel, 50,000 PSI ÷ 145 ≈ 345 MPa. This matches the well-known 50 ksi = 345 MPa Grade 50 steel equivalent.

Common PSI to MPa Conversions

Material strengths, weld specifications, and pressure ratings in both US (PSI) and international (MPa) systems.

Psi	Megapascal	Note
5,000 PSI	34.5 MPa	Standard concrete (f'c)
36,000 PSI	248 MPa	A36 steel yield (≈250 MPa nominal)
50,000 PSI	345 MPa	Grade 50 steel yield (≈350 MPa)
60,000 PSI	414 MPa	Grade 60 rebar yield
70,000 PSI	483 MPa	E70 weld electrode strength
100,000 PSI	689 MPa	High-strength alloy steel
120,000 PSI	827 MPa	A325/8.8 bolt tensile class
150,000 PSI	1034 MPa	A490/10.9 bolt tensile class

Solved Examples: PSI to MPa

Question 1: A US welding procedure specifies E7018 electrodes with 70,000 PSI minimum tensile strength. Convert to MPa for an ISO-coded WPS.

Solution:

Strength in MPa = 70,000 × 0.00689476

= 482.6 MPa

≈ 483 MPa

Answer: 70,000 PSI = 483 MPa. In ISO/AWS terms, E7018 (70 ksi) corresponds to E49 (490 MPa class) electrodes.

Question 2: An ASTM A572 Grade 50 beam has yield strength of 50,000 PSI minimum. What is the ISO equivalent in MPa?

Solution:

Yield in MPa = 50,000 × 0.00689476

= 344.7 MPa

≈ 345 MPa

Answer: 50,000 PSI = 345 MPa. The ISO equivalent is S355 steel (355 MPa nominal yield) — slightly higher.

Question 3: A tire manufacturer tests cord strength at 25,000 PSI. Express in MPa for the international spec sheet.

Solution:

Strength in MPa = 25,000 × 0.00689476

= 172.4 MPa

Answer: 25,000 PSI = 172.4 MPa tire cord tensile strength.

Question 4: A US pipeline code specifies maximum allowable stress of 30,000 PSI. Convert for an ISO pipeline design.

Solution:

Stress in MPa = 30,000 × 0.00689476

= 206.8 MPa

Answer: 30,000 PSI = 206.8 MPa allowable stress for the pipeline design.

Practice Questions: PSI to MPa

Try solving these on your own to test your understanding:

Convert 4,000 PSI (concrete) to MPa. (Answer: 27.6 MPa)
A stainless steel has yield of 30,000 PSI. Express in MPa. (Answer: 207 MPa)
Convert 80,000 PSI (weld metal) to MPa. (Answer: 552 MPa)
A fatigue limit is 40,000 PSI. What is this in MPa? (Answer: 276 MPa)
Convert 145,000 PSI (spring steel) to MPa. (Answer: 1000 MPa = 1 GPa)

International Welding Codes: AWS vs. ISO Electrode Classification

AWS classifies weld electrodes by tensile strength in ksi: E60 (60 ksi = 414 MPa), E70 (70 ksi = 483 MPa), E80 (80 ksi = 552 MPa), E90 (90 ksi = 621 MPa). ISO 2560 uses MPa classes: E35 (350 MPa), E42 (420 MPa), E49 (490 MPa), E55 (550 MPa). Converting PSI to MPa allows welding engineers to specify equivalent electrodes across coding systems. The most common match: AWS E7018 ↔ ISO E4918 (490 MPa class).

Steel Grade Equivalents: ASTM vs. EN/ISO

American steel grades (ASTM) use ksi/PSI while international grades (EN, ISO, JIS) use MPa. Key equivalences: A36 (36 ksi = 248 MPa) ≈ S235/S275; A572 Gr. 50 (50 ksi = 345 MPa) ≈ S355; A514 (100 ksi = 690 MPa) ≈ S690. These are approximate — actual specifications differ in chemistry, testing requirements, and allowable ranges. Always verify that the substitution meets all design code requirements, not just yield strength.

Concrete Strength: f'c in PSI to MPa

ACI 318 (US concrete code) traditionally specifies concrete compressive strength (f'c) in PSI: 3000, 4000, 5000, 6000 PSI are common grades. International codes (Eurocode 2, AS 3600) use MPa: C20, C30, C40. Conversions: 3000 PSI = 20.7 MPa (≈C20), 4000 PSI = 27.6 MPa (≈C28), 5000 PSI = 34.5 MPa (≈C35), 6000 PSI = 41.4 MPa (≈C40). Note that testing methods differ (cylinder vs. cube), so direct grade equivalence requires adjustment factors.

Key Takeaways

1 PSI = 0.00689476 MPa — divide PSI by 145 for quick conversion.
A36 steel: 36 ksi = 36,000 PSI = 248 MPa ≈ S235/S275 (EN).
Grade 50 steel: 50 ksi = 345 MPa ≈ S355 (EN).
AWS E70 weld electrode: 70,000 PSI = 483 MPa ≈ ISO E49 class.
Concrete 5000 PSI = 34.5 MPa ≈ C35 grade (Eurocode).
Always verify full specification requirements when substituting grades across standards.

Psi to Megapascal Conversion Formula

megapascal = psi × 0.0068948

1 psi = 0.0068948 megapascal

1 megapascal = 145.0377377 psi

Reverse: psi = megapascal × 145.0377377

Frequently Asked Questions

How many megapascal are in 1 psi?

There are 0.0068948 megapascal in 1 psi. To convert psi to megapascal, multiply the value by 0.0068948.

How do I convert psi to megapascal?

Multiply your psi value by 0.0068948 to get the equivalent in megapascal. For example, 5 psi = 5 × 0.0068948 = 0.03447 megapascal.

How do I convert megapascal to psi?

Multiply your megapascal value by 145.0377377 to get the equivalent in psi. Alternatively, divide by 0.0068948.

What is 10 psi in megapascal?

10 psi is equal to 0.06895 megapascal.

What is 100 psi in megapascal?

100 psi is equal to 0.68948 megapascal.