Megapascal to Ksi Converter
Enter the value that you want to convert megapascal (MPa) to ksi or ksi to megapascal.
1 megapascal = 0.1450377 ksi
Formula: ksi = megapascal value × 0.1450377
megapascal to ksi
10 megapascal = 1.45038 ksi
Popular Pressure Converters:
Megapascal to Ksi: The Essentials
What is Megapascal?
Megapascal (MPa) is a unit of pressure measurement. 1 megapascal is equal to 0.1450377 ksi.
The Ksi in Engineering
Ksi (ksi) is a unit of pressure measurement. 1 ksi is equal to 6.8947573 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 ksi metric conversion table
| 0.01 MPa | = | 0.00145 ksi |
| 0.1 MPa | = | 0.01450 ksi |
| 1 MPa | = | 0.14504 ksi |
| 2 MPa | = | 0.29008 ksi |
| 3 MPa | = | 0.43511 ksi |
| 4 MPa | = | 0.58015 ksi |
| 5 MPa | = | 0.72519 ksi |
| 6 MPa | = | 0.87023 ksi |
| 7 MPa | = | 1.01526 ksi |
| 8 MPa | = | 1.16030 ksi |
| 9 MPa | = | 1.30534 ksi |
| 10 MPa | = | 1.45038 ksi |
| 11 MPa | = | 1.59542 ksi |
| 12 MPa | = | 1.74045 ksi |
| 13 MPa | = | 1.88549 ksi |
| 14 MPa | = | 2.03053 ksi |
| 15 MPa | = | 2.17557 ksi |
| 16 MPa | = | 2.32060 ksi |
| 17 MPa | = | 2.46564 ksi |
| 18 MPa | = | 2.61068 ksi |
| 19 MPa | = | 2.75572 ksi |
| 20 MPa | = | 2.90075 ksi |
| 30 MPa | = | 4.35113 ksi |
| 40 MPa | = | 5.80151 ksi |
| 50 MPa | = | 7.25189 ksi |
| 60 MPa | = | 8.70226 ksi |
| 70 MPa | = | 10.15264 ksi |
| 80 MPa | = | 11.60302 ksi |
| 90 MPa | = | 13.05340 ksi |
| 100 MPa | = | 14.50377 ksi |
| 200 MPa | = | 29.00755 ksi |
| 300 MPa | = | 43.51132 ksi |
| 400 MPa | = | 58.01510 ksi |
| 500 MPa | = | 72.51887 ksi |
| 600 MPa | = | 87.02264 ksi |
| 700 MPa | = | 101.52642 ksi |
| 800 MPa | = | 116.03019 ksi |
| 900 MPa | = | 130.53396 ksi |
| 1000 MPa | = | 145.03774 ksi |
How to Convert Megapascal to Ksi?
We can convert megapascal to ksi by using an example.
Example:
Convert 20 Megapascal to Ksi?
We know 1 Megapascal = 0.1450377 ksi; 1 Ksi = 6.8947573 megapascal.
20 megapascal = ___ksi
20 × 0.1450377 = 2.90075 ksi (we know 1 megapascal = 0.1450377 ksi)
Answer:
20 megapascal = 2.90075 ksi
How to Convert MPa to ksi (Step-by-Step)
Converting megapascals to ksi (kilopounds per square inch) is essential when comparing international structural steel grades with US specifications. The conversion factor is 1 MPa = 0.145038 ksi.
- Write down the stress or pressure value in MPa.
- Multiply the MPa value by 0.145038.
- The result is the equivalent value in ksi.
- Alternatively, divide MPa by 6.89476 to get ksi.
Common MPa to ksi Conversions
Structural steel specifications comparing international (MPa) and US (ksi) values.
| Megapascal | Ksi |
|---|---|
| 200 MPa | 29.0 ksi |
| 248 MPa | 36.0 ksi |
| 345 MPa | 50.0 ksi |
| 400 MPa | 58.0 ksi |
| 450 MPa | 65.3 ksi |
| 690 MPa | 100.1 ksi |
| 860 MPa | 124.7 ksi |
| 1035 MPa | 150.1 ksi |
Solved Examples: MPa to ksi
Question 1: A European mill certificate shows yield strength 355 MPa (S355 steel). What is the equivalent ksi for US comparison?
Solution:
Stress in ksi = Stress in MPa × 0.145038
= 355 × 0.145038
= 51.49 ksi
Answer: 355 MPa = 51.5 ksi — this exceeds the 50 ksi minimum for A572 Grade 50, so it qualifies.
Question 2: An ISO bolt specification lists 640 MPa proof load (Class 8.8). Convert to ksi.
Solution:
Stress in ksi = 640 × 0.145038
= 92.82 ksi
Answer: 640 MPa = 92.8 ksi — between SAE Grade 5 (85 ksi) and Grade 8 (120 ksi).
Question 3: Ultra-high-strength steel has 1200 MPa tensile. Express in ksi.
Solution:
Stress in ksi = 1200 × 0.145038
= 174.05 ksi
Answer: 1200 MPa = 174 ksi — used in prestressing tendons and wire rope.
Practice Questions: MPa to ksi
Try solving these on your own to test your understanding:
- Convert 250 MPa to ksi. (Answer: 36.3 ksi)
- A572 Grade 65 has 450 MPa yield. Express in ksi. (Answer: 65.3 ksi)
- Convert 830 MPa (Grade 10.9 proof) to ksi. (Answer: 120.4 ksi)
- Aluminum 7075-T6 has 503 MPa tensile strength. What is this in ksi? (Answer: 72.9 ksi)
- Convert 2000 MPa (maraging steel) to ksi. (Answer: 290.1 ksi)
International vs US Structural Steel Grade Comparison
The most common equivalents: EN S235 (235 MPa / 34 ksi) ≈ ASTM A36 (36 ksi min); EN S275 (275 MPa / 39.9 ksi) — no direct US equivalent; EN S355 (355 MPa / 51.5 ksi) ≈ A572 Grade 50 (50 ksi min); EN S460 (460 MPa / 66.7 ksi) ≈ A913 Grade 65 (65 ksi). Note that equivalence requires matching all properties (yield, tensile, elongation, CVN toughness), not just yield strength.
Bolt Grade Cross-Reference: Metric to US
ISO metric bolt classes specify proof stress in MPa: Class 4.6 = 225 MPa (32.6 ksi), Class 8.8 = 580 MPa (84.1 ksi), Class 10.9 = 830 MPa (120.4 ksi), Class 12.9 = 970 MPa (140.7 ksi). US SAE equivalents: Grade 2 ≈ Class 4.6, Grade 5 ≈ Class 8.8, Grade 8 ≈ Class 10.9. There is no common US equivalent to Class 12.9. When substituting imported bolts, verify both proof load and tensile strength.
The "Divide by 7" Rule for Structural Engineers
US structural engineers working with international specs use the quick rule: MPa ÷ 7 ≈ ksi. This works because 1000/145.038 ≈ 6.895, which rounds to 7. The maximum error is about 1.5%, which is acceptable for initial grade comparison but not for final design calculations. Examples: 250 MPa ÷ 7 = 35.7 ksi (actual: 36.3); 345 MPa ÷ 7 = 49.3 ksi (actual: 50.0); 690 MPa ÷ 7 = 98.6 ksi (actual: 100.1).
Key Takeaways
- Multiply MPa by 0.145038 to get ksi (or divide by 6.895).
- Quick shortcut: MPa ÷ 7 ≈ ksi (error ~1.5%).
- Key benchmark: 345 MPa = 50 ksi (A572 Grade 50).
- ISO bolt Class 8.8 ≈ SAE Grade 5; Class 10.9 ≈ Grade 8.
- S355 steel (355 MPa) qualifies as Grade 50 (50 ksi) in US terms.
- Always verify all mechanical properties when substituting grades across systems.
Megapascal to Ksi Conversion Formula
ksi = megapascal × 0.1450377
1 megapascal = 0.1450377 ksi
1 ksi = 6.8947573 megapascal
Reverse: megapascal = ksi × 6.8947573
Frequently Asked Questions
How many ksi are in 1 megapascal?
There are 0.1450377 ksi in 1 megapascal. To convert megapascal to ksi, multiply the value by 0.1450377.
How do I convert megapascal to ksi?
Multiply your megapascal value by 0.1450377 to get the equivalent in ksi. For example, 5 megapascal = 5 × 0.1450377 = 0.72519 ksi.
How do I convert ksi to megapascal?
Multiply your ksi value by 6.8947573 to get the equivalent in megapascal. Alternatively, divide by 0.1450377.
What is 10 megapascal in ksi?
10 megapascal is equal to 1.45038 ksi.
What is 100 megapascal in ksi?
100 megapascal is equal to 14.50377 ksi.