Convert Pound per square inch to Megapascal
1 pound per square inch = 0.006894757 megapascal (MPa). For example, 10 pound per square inch = 0.06894757 megapascal and 100 pound per square inch = 0.6894757 megapascal. Type any value below to convert pound per square inch to megapascal both ways β it runs entirely in your browser.
Quick answer: Pound per square inch to Megapascal
1 Pound per square inch = 0.006894757 Megapascal (psi β MPa). To convert pound per square inch to megapascal, multiply by 0.006894757. To convert megapascal to pound per square inch, multiply by 145.0377. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common pound per square inch-to-megapascal questions.
How to convert Pound per square inch to Megapascal
To convert pound per square inch to megapascal, multiply the number of pound per square inch by the conversion factor 0.006894757, because 1 psi = 0.006894757 MPa. The conversion is linear, so the same factor works for any value β whole numbers, decimals or fractions. For the reverse direction, 1 MPa = 145.0377 psi, so you divide by 0.006894757 (or multiply by 145.0377) to turn megapascal back into pound per square inch.
MPa = psi Γ 0.006894757 Β·
psi = MPa Γ 145.0377
- Write down the value you want to convert, in pound per square inch.
- Multiply it by 0.006894757.
- The result is the same area/length/quantity expressed in megapascal.
Pound per square inch to Megapascal β worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 pound per square inch is 0.03447379 megapascal because 5 psi Γ 0.006894757 = 0.03447379 MPa.
| Pound per square inch | Calculation | Megapascal |
|---|---|---|
| 1 psi | 1 psi Γ 0.006894757 = 0.006894757 MPa | 0.006894757 MPa |
| 2 psi | 2 psi Γ 0.006894757 = 0.01378951 MPa | 0.01378951 MPa |
| 3 psi | 3 psi Γ 0.006894757 = 0.02068427 MPa | 0.02068427 MPa |
| 5 psi | 5 psi Γ 0.006894757 = 0.03447379 MPa | 0.03447379 MPa |
| 7 psi | 7 psi Γ 0.006894757 = 0.0482633 MPa | 0.0482633 MPa |
| 10 psi | 10 psi Γ 0.006894757 = 0.06894757 MPa | 0.06894757 MPa |
| 12 psi | 12 psi Γ 0.006894757 = 0.08273709 MPa | 0.08273709 MPa |
| 15 psi | 15 psi Γ 0.006894757 = 0.1034214 MPa | 0.1034214 MPa |
| 20 psi | 20 psi Γ 0.006894757 = 0.1378951 MPa | 0.1378951 MPa |
| 25 psi | 25 psi Γ 0.006894757 = 0.1723689 MPa | 0.1723689 MPa |
| 50 psi | 50 psi Γ 0.006894757 = 0.3447379 MPa | 0.3447379 MPa |
| 100 psi | 100 psi Γ 0.006894757 = 0.6894757 MPa | 0.6894757 MPa |
Common Pound per square inch to Megapascal conversions
These are the pound per square inch-to-megapascal values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 pound per square inch = 0.006894757 megapascal
- 2 pound per square inch = 0.01378951 megapascal
- 2.5 pound per square inch = 0.01723689 megapascal
- 3 pound per square inch = 0.02068427 megapascal
- 4 pound per square inch = 0.02757903 megapascal
- 5 pound per square inch = 0.03447379 megapascal
- 6 pound per square inch = 0.04136854 megapascal
- 7 pound per square inch = 0.0482633 megapascal
- 8 pound per square inch = 0.05515806 megapascal
- 9 pound per square inch = 0.06205282 megapascal
- 10 pound per square inch = 0.06894757 megapascal
- 12 pound per square inch = 0.08273709 megapascal
- 15 pound per square inch = 0.1034214 megapascal
- 20 pound per square inch = 0.1378951 megapascal
- 25 pound per square inch = 0.1723689 megapascal
- 30 pound per square inch = 0.2068427 megapascal
- 50 pound per square inch = 0.3447379 megapascal
- 75 pound per square inch = 0.5171068 megapascal
- 100 pound per square inch = 0.6894757 megapascal
- 200 pound per square inch = 1.378951 megapascal
- 500 pound per square inch = 3.447379 megapascal
- 1000 pound per square inch = 6.894757 megapascal
Pound per square inch to Megapascal conversion chart (both directions)
The chart below converts pound per square inch to megapascal and megapascal to pound per square inch side by side, so it works whichever way you need. 1 pound per square inch = 0.006894757 megapascal, and 1 megapascal = 145.0377 pound per square inch.
| Pound per square inch β Megapascal | Megapascal β Pound per square inch |
|---|---|
| 0.25 psi = 0.001723689 MPa | 0.25 MPa = 36.25943 psi |
| 0.5 psi = 0.003447379 MPa | 0.5 MPa = 72.51887 psi |
| 1 psi = 0.006894757 MPa | 1 MPa = 145.0377 psi |
| 2 psi = 0.01378951 MPa | 2 MPa = 290.0755 psi |
| 3 psi = 0.02068427 MPa | 3 MPa = 435.1132 psi |
| 4 psi = 0.02757903 MPa | 4 MPa = 580.151 psi |
| 5 psi = 0.03447379 MPa | 5 MPa = 725.1887 psi |
| 6 psi = 0.04136854 MPa | 6 MPa = 870.2264 psi |
| 7 psi = 0.0482633 MPa | 7 MPa = 1,015.264 psi |
| 8 psi = 0.05515806 MPa | 8 MPa = 1,160.302 psi |
| 9 psi = 0.06205282 MPa | 9 MPa = 1,305.34 psi |
| 10 psi = 0.06894757 MPa | 10 MPa = 1,450.377 psi |
| 12 psi = 0.08273709 MPa | 12 MPa = 1,740.453 psi |
| 15 psi = 0.1034214 MPa | 15 MPa = 2,175.566 psi |
| 20 psi = 0.1378951 MPa | 20 MPa = 2,900.755 psi |
| 25 psi = 0.1723689 MPa | 25 MPa = 3,625.943 psi |
| 30 psi = 0.2068427 MPa | 30 MPa = 4,351.132 psi |
| 40 psi = 0.2757903 MPa | 40 MPa = 5,801.51 psi |
| 50 psi = 0.3447379 MPa | 50 MPa = 7,251.887 psi |
| 75 psi = 0.5171068 MPa | 75 MPa = 10,877.83 psi |
| 100 psi = 0.6894757 MPa | 100 MPa = 14,503.77 psi |
| 150 psi = 1.034214 MPa | 150 MPa = 21,755.66 psi |
| 200 psi = 1.378951 MPa | 200 MPa = 29,007.55 psi |
| 250 psi = 1.723689 MPa | 250 MPa = 36,259.43 psi |
| 500 psi = 3.447379 MPa | 500 MPa = 72,518.87 psi |
| 1000 psi = 6.894757 MPa | 1000 MPa = 145,037.7 psi |
Pound per square inch vs Megapascal: which is bigger?
A megapascal is the larger unit: one megapascal equals 145.0377 pound per square inchs. Put another way, you need 145.0377 pound per square inchs to make a single megapascal.
What is a Pound per square inch? History, origin and usage
Pounds per square inch grew directly out of the steam age: boiler safety valves were rated by how many pounds of weight it took to hold them shut over a known area, and the unit survived into every later technology that Britain and the United States industrialised. It never went through a formal international definition of its own β instead it became exact in 1959, when the yard-and-pound agreement fixed the pound and the inch exactly, and again through the fixing of standard gravity, which pins down what a "pound of force" means.
Psi is the standard pressure unit in the United States and remains widely understood in Britain, India and elsewhere: tyre pressures, air compressors, pressure washers, water mains, hydraulic lines and scuba tanks. Car tyres are commonly inflated to around 30 to 35 psi.
Psi is exactly defined but its value in pascals is a decimal that repeats forever, so any written figure is necessarily rounded somewhere. Gauges usually read gauge pressure β the amount above surrounding air β which is why a flat tyre reads zero rather than about 14.7.
What is a Megapascal? History, origin and usage
The megapascal became the standard way to state material strength as structural engineering codes moved to SI. It replaced a patchwork of older units β kilograms-force per square centimetre in Europe and Asia, pounds per square inch in the United States and Britain β that made international standards hard to compare.
Megapascals are used wherever pressures or stresses are large: concrete and steel strength, hydraulic systems, injection moulding, and the pressure ratings of pipes and pressure vessels. Ordinary structural concrete is commonly specified somewhere around 20 to 40 MPa.
One megapascal is a million pascals, and also exactly 10 bar, which makes the two easy to swap in your head. One megapascal is also the same as one newton per square millimetre β a coincidence engineers use constantly, because it lets a stress in MPa be read straight off a force in newtons and an area in square millimetres.
Convert 1 Pound per square inch to other units
It can help to see a pound per square inch next to the other units it is commonly compared with. One pound per square inch (psi) is equal to:
| 1 Pound per square inch equals | Unit |
|---|---|
| 6,894.757 Pa | Pascal |
| 68.94757 hPa | Hectopascal |
| 6.894757 kPa | Kilopascal |
| 0.006894757 MPa | Megapascal |
| 68.94757 mbar | Millibar |
| 0.06894757 bar | Bar |
| 0.06804596 atm | Standard atmosphere |
| 51.71493 Torr | Torr |
| 51.71493 mmHg | Millimetre of mercury |
| 2.036021 inHg | Inch of mercury |
| 703.0696 mmHβO | Millimetre of water |
| 27.6799 inHβO | Inch of water |
| 0.07030696 kgf/cmΒ² | Kilogram-force per square centimetre |
Convert 1 Megapascal to other units
One megapascal (MPa) is equal to:
| 1 Megapascal equals | Unit |
|---|---|
| 1,000,000 Pa | Pascal |
| 10,000 hPa | Hectopascal |
| 1,000 kPa | Kilopascal |
| 10,000 mbar | Millibar |
| 10 bar | Bar |
| 9.869233 atm | Standard atmosphere |
| 7,500.617 Torr | Torr |
| 7,500.616 mmHg | Millimetre of mercury |
| 295.2998 inHg | Inch of mercury |
| 101,971.6 mmHβO | Millimetre of water |
| 4,014.631 inHβO | Inch of water |
| 145.0377 psi | Pound per square inch |
| 10.19716 kgf/cmΒ² | Kilogram-force per square centimetre |
Tips for converting Pound per square inch to Megapascal
- To go from pound per square inch to megapascal, multiply by 0.006894757; to go back, divide by 0.006894757 (or multiply by 145.0377).
- For a quick mental estimate, remember that 1 pound per square inch β 0.006894757 megapascal, so 10 pound per square inch β 0.06894757 megapascal.
- The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
- Both fields update live as you type β change either side to convert in that direction.
How to use this Pound per square inch to Megapascal converter
Type a number into the Pound per square inch field and the equivalent in Megapascal appears instantly β there is no βconvertβ button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Megapascal field to convert the other way (megapascal to pound per square inch). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above β use the chart for quick look-ups and the tool for precise work.
Accuracy and method
Every figure on this page β the formula, the worked examples, the conversion chart and the βconvert to other unitsβ tables β is computed from a single verified conversion factor (1 psi = 0.006894757 MPa), never copied from a hand-typed lookup table that could drift. That factor is derived from each unitβs definition in terms of a common base unit, and an automated check re-verifies all of the siteβs factors on every update, so the numbers here stay correct over time. This matters for pound per square inch-to-megapascal conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.
Sources
- NIST Special Publication 811 β Guide for the Use of the SI β publishes the exact metric equivalents of the customary pressure units. A psi is one pound of force over one square inch, and the 1959 international yard-and-pound agreement fixes the pound at exactly 0.453 592 37 kilogram and the inch at exactly 0.0254 metre, while standard gravity is fixed at exactly 9.806 65 m/sΒ² β so psi, inches of mercury and inches of water are defined exactly rather than measured.
- BIPM β The International System of Units (SI Brochure) β the defining document for the SI, published by the International Bureau of Weights and Measures. It fixes the base unit that this conversion resolves to, which is why the factor here can be exact rather than approximate.
Pressure factors here come from fixed definitions, anchored to the pascal: a bar is exactly 100,000 Pa, one atmosphere is exactly 101,325 Pa, a torr is exactly a 760th of an atmosphere, and psi is built from the exact pound and the exact inch. Two of them β psi and the torr β work out to decimals that repeat forever, so where a number is shown rounded it is marked, not quietly trimmed.
Frequently asked questions
- How many megapascal are in 1 pound per square inch?
- 1 pound per square inch = 0.006894757 megapascal (MPa). To convert any number of pound per square inch to megapascal, multiply by 0.006894757.
- How do I convert pound per square inch to megapascal?
- Multiply the number of pound per square inch by 0.006894757. For example, 10 pound per square inch = 10 Γ 0.006894757 = 0.06894757 megapascal, and 25 pound per square inch = 0.1723689 megapascal.
- How many pound per square inch are in 1 megapascal?
- 1 megapascal = 145.0377 pound per square inch. So to convert megapascal back to pound per square inch, multiply by 145.0377.
- What is the formula to convert pound per square inch to megapascal?
- megapascal = pound per square inch Γ 0.006894757. The reverse formula is pound per square inch = megapascal Γ 145.0377.
- How much is 100 pound per square inch in megapascal?
- 100 pound per square inch = 0.6894757 megapascal. (And 1000 pound per square inch = 6.894757 megapascal.)
- Which is bigger, a pound per square inch or a megapascal?
- A megapascal is larger: 1 megapascal = 145.0377 pound per square inch.
- Is this pound per square inch to megapascal converter accurate?
- Yes β every value is computed from the exact 0.006894757 MPa per psi factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert megapascal to pound per square inch too?
- Yes. The converter works both ways β enter a value in either field. 1 megapascal = 145.0377 pound per square inch.