Convert Megapascal to Pound per square inch
1 megapascal = 145.0377 pound per square inch (psi). For example, 10 megapascal = 1,450.377 pound per square inch and 100 megapascal = 14,503.77 pound per square inch. Type any value below to convert megapascal to pound per square inch both ways β it runs entirely in your browser.
Quick answer: Megapascal to Pound per square inch
1 Megapascal = 145.0377 Pound per square inch (MPa β psi). To convert megapascal to pound per square inch, multiply by 145.0377. To convert pound per square inch to megapascal, multiply by 0.006894757. 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 megapascal-to-pound per square inch questions.
How to convert Megapascal to Pound per square inch
To convert megapascal to pound per square inch, multiply the number of megapascal by the conversion factor 145.0377, because 1 MPa = 145.0377 psi. The conversion is linear, so the same factor works for any value β whole numbers, decimals or fractions. For the reverse direction, 1 psi = 0.006894757 MPa, so you divide by 145.0377 (or multiply by 0.006894757) to turn pound per square inch back into megapascal.
psi = MPa Γ 145.0377 Β·
MPa = psi Γ 0.006894757
- Write down the value you want to convert, in megapascal.
- Multiply it by 145.0377.
- The result is the same area/length/quantity expressed in pound per square inch.
Megapascal to Pound per square inch β worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 megapascal is 725.1887 pound per square inch because 5 MPa Γ 145.0377 = 725.1887 psi.
| Megapascal | Calculation | Pound per square inch |
|---|---|---|
| 1 MPa | 1 MPa Γ 145.0377 = 145.0377 psi | 145.0377 psi |
| 2 MPa | 2 MPa Γ 145.0377 = 290.0755 psi | 290.0755 psi |
| 3 MPa | 3 MPa Γ 145.0377 = 435.1132 psi | 435.1132 psi |
| 5 MPa | 5 MPa Γ 145.0377 = 725.1887 psi | 725.1887 psi |
| 7 MPa | 7 MPa Γ 145.0377 = 1,015.264 psi | 1,015.264 psi |
| 10 MPa | 10 MPa Γ 145.0377 = 1,450.377 psi | 1,450.377 psi |
| 12 MPa | 12 MPa Γ 145.0377 = 1,740.453 psi | 1,740.453 psi |
| 15 MPa | 15 MPa Γ 145.0377 = 2,175.566 psi | 2,175.566 psi |
| 20 MPa | 20 MPa Γ 145.0377 = 2,900.755 psi | 2,900.755 psi |
| 25 MPa | 25 MPa Γ 145.0377 = 3,625.943 psi | 3,625.943 psi |
| 50 MPa | 50 MPa Γ 145.0377 = 7,251.887 psi | 7,251.887 psi |
| 100 MPa | 100 MPa Γ 145.0377 = 14,503.77 psi | 14,503.77 psi |
Common Megapascal to Pound per square inch conversions
These are the megapascal-to-pound per square inch values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 megapascal = 145.0377 pound per square inch
- 2 megapascal = 290.0755 pound per square inch
- 2.5 megapascal = 362.5943 pound per square inch
- 3 megapascal = 435.1132 pound per square inch
- 4 megapascal = 580.151 pound per square inch
- 5 megapascal = 725.1887 pound per square inch
- 6 megapascal = 870.2264 pound per square inch
- 7 megapascal = 1,015.264 pound per square inch
- 8 megapascal = 1,160.302 pound per square inch
- 9 megapascal = 1,305.34 pound per square inch
- 10 megapascal = 1,450.377 pound per square inch
- 12 megapascal = 1,740.453 pound per square inch
- 15 megapascal = 2,175.566 pound per square inch
- 20 megapascal = 2,900.755 pound per square inch
- 25 megapascal = 3,625.943 pound per square inch
- 30 megapascal = 4,351.132 pound per square inch
- 50 megapascal = 7,251.887 pound per square inch
- 75 megapascal = 10,877.83 pound per square inch
- 100 megapascal = 14,503.77 pound per square inch
- 200 megapascal = 29,007.55 pound per square inch
- 500 megapascal = 72,518.87 pound per square inch
- 1000 megapascal = 145,037.7 pound per square inch
Megapascal to Pound per square inch conversion chart (both directions)
The chart below converts megapascal to pound per square inch and pound per square inch to megapascal side by side, so it works whichever way you need. 1 megapascal = 145.0377 pound per square inch, and 1 pound per square inch = 0.006894757 megapascal.
| Megapascal β Pound per square inch | Pound per square inch β Megapascal |
|---|---|
| 0.25 MPa = 36.25943 psi | 0.25 psi = 0.001723689 MPa |
| 0.5 MPa = 72.51887 psi | 0.5 psi = 0.003447379 MPa |
| 1 MPa = 145.0377 psi | 1 psi = 0.006894757 MPa |
| 2 MPa = 290.0755 psi | 2 psi = 0.01378951 MPa |
| 3 MPa = 435.1132 psi | 3 psi = 0.02068427 MPa |
| 4 MPa = 580.151 psi | 4 psi = 0.02757903 MPa |
| 5 MPa = 725.1887 psi | 5 psi = 0.03447379 MPa |
| 6 MPa = 870.2264 psi | 6 psi = 0.04136854 MPa |
| 7 MPa = 1,015.264 psi | 7 psi = 0.0482633 MPa |
| 8 MPa = 1,160.302 psi | 8 psi = 0.05515806 MPa |
| 9 MPa = 1,305.34 psi | 9 psi = 0.06205282 MPa |
| 10 MPa = 1,450.377 psi | 10 psi = 0.06894757 MPa |
| 12 MPa = 1,740.453 psi | 12 psi = 0.08273709 MPa |
| 15 MPa = 2,175.566 psi | 15 psi = 0.1034214 MPa |
| 20 MPa = 2,900.755 psi | 20 psi = 0.1378951 MPa |
| 25 MPa = 3,625.943 psi | 25 psi = 0.1723689 MPa |
| 30 MPa = 4,351.132 psi | 30 psi = 0.2068427 MPa |
| 40 MPa = 5,801.51 psi | 40 psi = 0.2757903 MPa |
| 50 MPa = 7,251.887 psi | 50 psi = 0.3447379 MPa |
| 75 MPa = 10,877.83 psi | 75 psi = 0.5171068 MPa |
| 100 MPa = 14,503.77 psi | 100 psi = 0.6894757 MPa |
| 150 MPa = 21,755.66 psi | 150 psi = 1.034214 MPa |
| 200 MPa = 29,007.55 psi | 200 psi = 1.378951 MPa |
| 250 MPa = 36,259.43 psi | 250 psi = 1.723689 MPa |
| 500 MPa = 72,518.87 psi | 500 psi = 3.447379 MPa |
| 1000 MPa = 145,037.7 psi | 1000 psi = 6.894757 MPa |
Megapascal vs Pound per square inch: 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 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.
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.
Convert 1 Megapascal to other units
It can help to see a megapascal next to the other units it is commonly compared with. 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 |
Convert 1 Pound per square inch to other units
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 |
Tips for converting Megapascal to Pound per square inch
- To go from megapascal to pound per square inch, multiply by 145.0377; to go back, divide by 145.0377 (or multiply by 0.006894757).
- For a quick mental estimate, remember that 1 megapascal β 145.0377 pound per square inch, so 10 megapascal β 1,450.377 pound per square inch.
- 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 Megapascal to Pound per square inch converter
Type a number into the Megapascal field and the equivalent in Pound per square inch 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 Pound per square inch field to convert the other way (pound per square inch to megapascal). 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 MPa = 145.0377 psi), 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 megapascal-to-pound per square inch 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 pound per square inch are in 1 megapascal?
- 1 megapascal = 145.0377 pound per square inch (psi). To convert any number of megapascal to pound per square inch, multiply by 145.0377.
- How do I convert megapascal to pound per square inch?
- Multiply the number of megapascal by 145.0377. For example, 10 megapascal = 10 Γ 145.0377 = 1,450.377 pound per square inch, and 25 megapascal = 3,625.943 pound per square inch.
- How many megapascal are in 1 pound per square inch?
- 1 pound per square inch = 0.006894757 megapascal. So to convert pound per square inch back to megapascal, multiply by 0.006894757.
- What is the formula to convert megapascal to pound per square inch?
- pound per square inch = megapascal Γ 145.0377. The reverse formula is megapascal = pound per square inch Γ 0.006894757.
- How much is 100 megapascal in pound per square inch?
- 100 megapascal = 14,503.77 pound per square inch. (And 1000 megapascal = 145,037.7 pound per square inch.)
- Which is bigger, a megapascal or a pound per square inch?
- A megapascal is larger: 1 megapascal = 145.0377 pound per square inch.
- Is this megapascal to pound per square inch converter accurate?
- Yes β every value is computed from the exact 145.0377 psi per MPa factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert pound per square inch to megapascal too?
- Yes. The converter works both ways β enter a value in either field. 1 pound per square inch = 0.006894757 megapascal.