This converter turns pounds per square inch into megapascals instantly, using the exact factor 1 pound per square inch = 0.006894757293 megapascals. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The dominant US pressure unit for tyres, plumbing and compressors. Used for material strength and hydraulic systems.
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
pounds per square inch- The amount you are converting, measured in pounds per square inch
0.006894757293- The exact number of megapascals in one pound per square inch
megapascals- The converted result
How it works, step by step
- Enter the number of pounds per square inch you want to convert.
- The value is multiplied by 0.006894757293, the exact conversion factor.
- The result is displayed in megapascals, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 pounds per square inch
Multiply 5 by 0.0068947573. That gives 0.034474 megapascals. A quick sanity check: one pound per square inch is smaller than one megapascal, so the number should get smaller — and it does.
Converting 72 pounds per square inch
72 × 0.0068947573 = 0.496423 megapascals. Working backwards, 0.496423 ÷ 0.0068947573 returns 72 pounds per square inch, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many megapascals are in one pound per square inch?
Exactly 0.006894757293. 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 pounds per square inch to megapascals?
Megapascals = pounds per square inch × 0.006894757293. To reverse it, divide instead: pounds per square inch = megapascals ÷ 0.006894757293, which is the same as multiplying by 145.0377377.
Is the pound per square inch bigger than the megapascal?
No. One pound per square inch is only 0.00689476 of a megapascal, so the megapascal is the larger unit.
Why does my answer differ slightly from other psi to megapascals 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 pound per square inch?
The dominant US pressure unit for tyres, plumbing and compressors.
What is a megapascal?
Used for material strength and hydraulic systems.
Pounds Per Square Inch to megapascals reference table
| Pounds Per Square Inch | Megapascals |
|---|---|
| 0.5 psi | 0.003447 MPa |
| 1 psi | 0.006895 MPa |
| 2 psi | 0.01379 MPa |
| 3 psi | 0.020684 MPa |
| 5 psi | 0.034474 MPa |
| 10 psi | 0.068948 MPa |
| 15 psi | 0.103421 MPa |
| 20 psi | 0.137895 MPa |
| 25 psi | 0.172369 MPa |
| 50 psi | 0.344738 MPa |
| 75 psi | 0.517107 MPa |
| 100 psi | 0.689476 MPa |
| 250 psi | 1.7237 MPa |
| 500 psi | 3.4474 MPa |
| 1000 psi | 6.8948 MPa |
Exact factor: 1 pound per square inch = 0.006894757293 megapascals. Values rounded for display.