Ksi to Megapascal Converter
Enter the value that you want to convert ksi to megapascal (MPa) or megapascal to ksi.
1 ksi = 6.8947573 megapascal
Formula: megapascal = ksi value × 6.8947573
ksi to megapascal
10 ksi = 68.94757 megapascal
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Ksi to Megapascal: The Essentials
The Ksi in Engineering
Ksi (ksi) is a unit of pressure measurement. 1 ksi is equal to 6.8947573 megapascal.
What is Megapascal?
Megapascal (MPa) is a unit of pressure measurement. 1 megapascal is equal to 0.1450377 ksi.
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.
ksi to megapascal metric conversion table
| 0.01 ksi | = | 0.06895 MPa |
| 0.1 ksi | = | 0.68948 MPa |
| 1 ksi | = | 6.89476 MPa |
| 2 ksi | = | 13.78951 MPa |
| 3 ksi | = | 20.68427 MPa |
| 4 ksi | = | 27.57903 MPa |
| 5 ksi | = | 34.47379 MPa |
| 6 ksi | = | 41.36854 MPa |
| 7 ksi | = | 48.26330 MPa |
| 8 ksi | = | 55.15806 MPa |
| 9 ksi | = | 62.05282 MPa |
| 10 ksi | = | 68.94757 MPa |
| 11 ksi | = | 75.84233 MPa |
| 12 ksi | = | 82.73709 MPa |
| 13 ksi | = | 89.63184 MPa |
| 14 ksi | = | 96.52660 MPa |
| 15 ksi | = | 103.42136 MPa |
| 16 ksi | = | 110.31612 MPa |
| 17 ksi | = | 117.21087 MPa |
| 18 ksi | = | 124.10563 MPa |
| 19 ksi | = | 131.00039 MPa |
| 20 ksi | = | 137.89515 MPa |
| 30 ksi | = | 206.84272 MPa |
| 40 ksi | = | 275.79029 MPa |
| 50 ksi | = | 344.73786 MPa |
| 60 ksi | = | 413.68544 MPa |
| 70 ksi | = | 482.63301 MPa |
| 80 ksi | = | 551.58058 MPa |
| 90 ksi | = | 620.52816 MPa |
| 100 ksi | = | 689.47573 MPa |
| 200 ksi | = | 1378.95146 MPa |
| 300 ksi | = | 2068.42719 MPa |
| 400 ksi | = | 2757.90292 MPa |
| 500 ksi | = | 3447.37865 MPa |
| 600 ksi | = | 4136.85438 MPa |
| 700 ksi | = | 4826.33011 MPa |
| 800 ksi | = | 5515.80583 MPa |
| 900 ksi | = | 6205.28156 MPa |
| 1000 ksi | = | 6894.75729 MPa |
How to Convert Ksi to Megapascal?
We can convert ksi to megapascal by using an example.
Example:
Convert 20 Ksi to Megapascal?
We know 1 Ksi = 6.8947573 megapascal; 1 Megapascal = 0.1450377 ksi.
20 ksi = ___MPa
20 × 6.8947573 = 137.89515 MPa (we know 1 ksi = 6.8947573 megapascal)
Answer:
20 ksi = 137.89515 megapascal
How to Convert ksi to MPa (Step-by-Step)
Converting ksi to MPa is the most common cross-system conversion in structural engineering, bridging AISC (US) and Eurocode (international) steel design. The conversion factor is 1 ksi = 6.89476 MPa.
- Write down the stress value in ksi.
- Multiply the ksi value by 6.89476.
- The result is the equivalent stress in megapascals (MPa).
- For quick estimation, multiply by 6.9 (overshoots by only 0.08%).
Common ksi to MPa Conversions
Critical US structural steel grades with their metric MPa equivalents.
| Ksi | Megapascal |
|---|---|
| 36 ksi | 248.2 MPa |
| 46 ksi | 317.2 MPa |
| 50 ksi | 344.7 MPa |
| 65 ksi | 448.2 MPa |
| 92 ksi | 634.3 MPa |
| 100 ksi | 689.5 MPa |
| 120 ksi | 827.4 MPa |
| 150 ksi | 1034.2 MPa |
Solved Examples: ksi to MPa
Question 1: A US steel mill report shows 53 ksi actual yield for A992 steel. Convert to MPa for a Eurocode design check.
Solution:
Stress in MPa = Stress in ksi × 6.89476
= 53 × 6.89476
= 365.4 MPa
Answer: 53 ksi = 365.4 MPa — exceeds S355 (355 MPa) Eurocode requirement.
Question 2: A connection design requires 90 ksi bolt shear strength. Express in MPa.
Solution:
Stress in MPa = 90 × 6.89476
= 620.5 MPa
Answer: 90 ksi = 620.5 MPa — confirming compatibility with M20 Grade 8.8 bolts (800 MPa tensile).
Question 3: A welding procedure specifies E70 electrodes (70 ksi tensile). Convert to MPa.
Solution:
Stress in MPa = 70 × 6.89476
= 482.6 MPa
Answer: 70 ksi = 482.6 MPa — matching ISO designation E49 (490 MPa class) electrodes.
Question 4: A seismic design requires Ry × Fy where Fy = 50 ksi and Ry = 1.1. Find the expected yield in MPa.
Solution:
Expected yield = 1.1 × 50 = 55 ksi
In MPa = 55 × 6.89476 = 379.2 MPa
Answer: Expected yield = 55 ksi = 379.2 MPa — used for capacity design of connections.
Practice Questions: ksi to MPa
Try solving these on your own to test your understanding:
- Convert 36 ksi to MPa. (Answer: 248.2 MPa)
- A steel has 58 ksi tensile strength. Express in MPa. (Answer: 399.9 MPa)
- Convert 100 ksi to MPa. (Answer: 689.5 MPa)
- Grade 60 rebar (60 ksi yield) in MPa? (Answer: 413.7 MPa)
- Convert 270 ksi prestressing strand to MPa. (Answer: 1861.6 MPa)
AISC to Eurocode Steel Grade Cross-Reference
The most critical ksi-to-MPa equivalents for structural steel: A36/A992 (36-50 ksi yield, 248-345 MPa) maps to EN S235-S355; A913 Grade 65 (65 ksi, 448 MPa) maps to S460; A514 (100 ksi, 690 MPa) maps to S690QL. Bolt grades: A325 (92/120 ksi proof/tensile, 634/827 MPa) ≈ Grade 8.8; A490 (120/150 ksi, 827/1034 MPa) ≈ Grade 10.9. These mappings are approximate — formal substitution requires full property comparison.
Seismic Design and Material Overstrength in Both Systems
Seismic design philosophy requires knowing expected (actual) yield, not just minimum specified yield. US practice uses Ry factors (typically 1.1-1.5) applied to Fy in ksi. When converting to international practice, the same overstrength concept applies but values are in MPa. For A992 steel: specified Fy = 50 ksi (345 MPa), expected Fy = 55 ksi (379 MPa), maximum Fy = 65 ksi (448 MPa). These bounds ensure ductile fuse mechanisms form where intended.
Welding Electrode Classification: AWS vs ISO
AWS classifies welding electrodes by tensile strength in ksi: E60 (60 ksi), E70 (70 ksi), E80 (80 ksi), E90 (90 ksi). ISO classifies by MPa: E42 (420 MPa), E49 (490 MPa), E55 (550 MPa), E62 (620 MPa). Converting: E70 = 70 × 6.895 = 483 MPa ≈ E49. When specifying welds on international projects, this conversion ensures matching consumable selection.
Key Takeaways
- Multiply ksi by 6.89476 to get MPa.
- Quick shortcut: ksi × 7 ≈ MPa (overshoots ~1.5%).
- Key benchmark: 50 ksi = 344.7 MPa (A572 Grade 50 ≈ S355).
- This is the most important conversion for international structural engineering.
- Bolt grades: A325 ≈ 8.8, A490 ≈ 10.9 (in metric).
- Welding: AWS E70 ≈ ISO E49 (483 vs 490 MPa nominal).
Ksi to Megapascal Conversion Formula
megapascal = ksi × 6.8947573
1 ksi = 6.8947573 megapascal
1 megapascal = 0.1450377 ksi
Reverse: ksi = megapascal × 0.1450377
Frequently Asked Questions
How many megapascal are in 1 ksi?
There are 6.8947573 megapascal in 1 ksi. To convert ksi to megapascal, multiply the value by 6.8947573.
How do I convert ksi to megapascal?
Multiply your ksi value by 6.8947573 to get the equivalent in megapascal. For example, 5 ksi = 5 × 6.8947573 = 34.47379 megapascal.
How do I convert megapascal to ksi?
Multiply your megapascal value by 0.1450377 to get the equivalent in ksi. Alternatively, divide by 6.8947573.
What is 10 ksi in megapascal?
10 ksi is equal to 68.94757 megapascal.
What is 100 ksi in megapascal?
100 ksi is equal to 689.47573 megapascal.