This converter turns megapascals into pounds per square inch instantly, using the exact factor 1 megapascal = 145.0377377 pounds per square inch. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
Used for material strength and hydraulic systems. The dominant US pressure unit for tyres, plumbing and compressors.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
megapascals- The amount you are converting, measured in megapascals
145.0377377- The exact number of pounds per square inch in one megapascal
pounds per square inch- The converted result
How it works, step by step
- Enter the number of megapascals you want to convert.
- The value is multiplied by 145.0377377, the exact conversion factor.
- The result is displayed in pounds per square inch, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 megapascals
Multiply 5 by 145.03774. That gives 725.1887 pounds per square inch. A quick sanity check: one megapascal is larger than one pound per square inch, so the number should get bigger — and it does.
Converting 72 megapascals
72 × 145.03774 = 10,442.72 pounds per square inch. Working backwards, 10,442.72 ÷ 145.03774 returns 72 megapascals, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many pounds per square inch are in one megapascal?
Exactly 145.0377377. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert megapascals to pounds per square inch?
Pounds Per Square Inch = megapascals × 145.0377377. To reverse it, divide instead: megapascals = pounds per square inch ÷ 145.0377377, which is the same as multiplying by 0.006894757293.
Is the megapascal bigger than the pound per square inch?
Yes. One megapascal equals 145.038 pounds per square inch, so it is the larger unit.
Why does my answer differ slightly from other megapascals to psi converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a megapascal?
Used for material strength and hydraulic systems.
What is a pound per square inch?
The dominant US pressure unit for tyres, plumbing and compressors.
Megapascals to pounds per square inch reference table
| Megapascals | Pounds Per Square Inch |
|---|---|
| 0.5 MPa | 72.5189 psi |
| 1 MPa | 145.0377 psi |
| 2 MPa | 290.0755 psi |
| 3 MPa | 435.1132 psi |
| 5 MPa | 725.1887 psi |
| 10 MPa | 1,450.38 psi |
| 15 MPa | 2,175.57 psi |
| 20 MPa | 2,900.75 psi |
| 25 MPa | 3,625.94 psi |
| 50 MPa | 7,251.89 psi |
| 75 MPa | 10,877.83 psi |
| 100 MPa | 14,503.77 psi |
| 250 MPa | 36,259.43 psi |
| 500 MPa | 72,518.87 psi |
| 1000 MPa | 145,037.74 psi |
Exact factor: 1 megapascal = 145.0377377 pounds per square inch. Values rounded for display.