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Multiple conversions
To convert a pressure from megapascals (MPa) to pascals (Pa), multiply by 1,000,000 (10⁶).
The mega prefix means one million, so the conversion is an exact six-place decimal shift. Divide by 10⁶ to go from Pa back to MPa.
A structural calculation needs the yield strength of a steel grade, quoted as 355 MPa, in base SI units for a finite-element input file:
Entered as 3.55e8 Pa, the value is consistent with the model's other SI inputs (newtons, meters, kilograms).
| MPa | Pa |
|---|---|
| 0.1 | 100,000 |
| 1 | 1,000,000 |
| 10 | 10,000,000 |
| 25 | 25,000,000 |
| 355 | 355,000,000 |
| 1,000 | 1,000,000,000 |
The megapascal is where solid mechanics actually lives: concrete crushes around 30 MPa, structural steels yield at 235–460 MPa, hydraulic systems run at 20–35 MPa, and material datasheets worldwide speak MPa (conveniently equal to N/mm²). The plain pascal, by contrast, is where the equations live — every SI formula relating force, area, and energy assumes N and m, which makes stress come out in N/m², i.e., pascals. The conversion is therefore a doorway between reading and computing: values enter an analysis quoted in MPa and must be expanded by 10⁶ before they can meet elastic moduli, densities and accelerations inside a consistent unit system. Simulation software is the classic tripwire — a model built in meters that receives "355" instead of "355e6" for yield strength will cheerfully predict a structure a million times weaker than reality, and the error surfaces only as absurd deflections. Experienced analysts anchor themselves with one number: Young's modulus of steel is 200 GPa = 2 × 10¹¹ Pa. If the moduli and strengths in a model don't stand about three orders of magnitude apart, a prefix has gone missing somewhere.
To convert from megapascal (MPa) to kilopascal (kPa), use the following formula:
kilopascal (kPa)
= 1000× megapascal (MPa)
To convert from megapascal (MPa) to hectopascal (hPa), use the following formula:
hectopascal (hPa)
= 1000 × 10× megapascal (MPa)
= 104× megapascal (MPa)
To convert from megapascal (MPa) to millibar (mbar), use the following formula:
millibar (mbar)
= 1000 × 10× megapascal (MPa)
= 104× megapascal (MPa)
To convert pressure from megapascals (MPa) to bar, multiply by 10. That is the entire formula — the two units differ by exactly one order of magnitude.
Both units are decimal multiples of the pascal: 1 MPa is 1,000,000 Pa, and 1 bar is defined as exactly 100,000 Pa. The ratio is therefore precisely 10, with no rounding involved.
The most frequently searched value illustrates it:
A hydraulic cylinder is specified for a working pressure of 21 MPa, and your gauge reads in bar:
Reverse direction: divide by 10 — a 350 bar hydraulic system runs at 35 MPa.
| MPa | bar |
|---|---|
| 0.1 | 1 |
| 0.5 | 5 |
| 1 | 10 |
| 2.5 | 25 |
| 10 | 100 |
| 21 | 210 |
| 35 | 350 |
MPa is the SI-preferred unit and dominates in East Asian engineering documentation — Japanese and Chinese valve, compressor and material specifications quote pressure (and material strength) in MPa. Bar remains the everyday unit of European industrial practice: gauges, pneumatic systems (6–8 bar shop air), tire pressure and pump datasheets. The result is that anyone comparing an Asian component datasheet against a European system spec does this ×10 shift constantly. It is worth the one-second check because both units appear in similar numeric ranges for common equipment; misreading 1.6 MPa as 1.6 bar understates the pressure by a factor of ten — the difference between a PN16 flange rating and a vacuum-adjacent duty. Materials engineers get a bonus from the same factor: yield strengths in MPa convert to bar the same way, though in practice N/mm² (= MPa) is the spelling they will see.
To convert from megapascal (MPa) to torr (torr), use the following formula:
torr (torr)
= 1000 × 760000101325× megapascal (MPa)
= 7500.616827041697508× megapascal (MPa)
To convert from megapascal (MPa) to meter of water @ 4°C (mH2O), use the following formula:
meter of water @ 4°C (mH2O)
= 1000 × 19.80665× megapascal (MPa)
= 101.97162129779282426× megapascal (MPa)
To convert from megapascal (MPa) to millimeter of mercury (mmHg), use the following formula:
millimeter of mercury (mmHg)
= 1000 × 10.133322× megapascal (MPa)
= 7500.637554192106329× megapascal (MPa)
To convert a pressure or stress from megapascals (MPa) to pounds per square inch (psi), multiply by 145.04.
The factor is a thousand times the kilopascal one, because a megapascal is a thousand kilopascals: 1,000,000 ÷ 6,894.76 = 145.0377 psi. Going back the other way, divide by 145.04 — or multiply by 0.006895.
The anchor most people already know sits at the bottom of the scale:
A Japanese hydraulic power unit is rated for 21 MPa continuous working pressure, and a US hose supplier quotes hose in psi:
That number is not a coincidence. 21 MPa and the American 3,000 psi rating are the same industry standard expressed in two systems, which is why 3,000 psi hose is the correct match rather than an approximation.
| MPa | psi |
|---|---|
| 0.1 | 14.50 |
| 1 | 145.0 |
| 7 | 1,015 |
| 21 | 3,046 |
| 30 | 4,351 |
| 35 | 5,076 |
| 70 | 10,153 |
Wherever pressure runs into the thousands of psi, the metric world writes MPa and the American world writes psi, so this conversion governs the specification of hydraulics, concrete, pipelines and high-pressure water. Hydraulics is the most standardized: the common working pressures line up as 21 MPa ↔ 3,000 psi, 35 MPa ↔ 5,000 psi and 70 MPa ↔ 10,000 psi, pairs worth memorizing because they recur on every pump, hose and fitting catalog. Concrete is the widest-reaching: a C30 mix means 30 MPa characteristic strength, which an American mix design would call 4,351 psi and round to the familiar 4,000 psi class — near enough that the two grades are often treated as equivalent, and different enough that a structural check should convert rather than assume. Waterjet cutting occupies the extreme, where a 414 MPa pump is sold in the United States as 60,000 psi.
Because the numbers grow large, the failure mode here is not arithmetic but magnitude. A slipped prefix turns 21 MPa into 21 kPa, and 3,046 psi into 3 psi — a difference between a working hydraulic system and a barely inflated balloon. The habit that catches it is to check the answer against the nearest anchor above before using it: anything in industrial hydraulics should land in the thousands of psi, and anything that does not has lost a prefix somewhere.
To convert a stress from megapascals (MPa) to kilopounds per square inch (ksi), multiply by 0.14504.
The factor is the reciprocal of 6.89476 MPa per ksi, which itself follows from the pound-force and the inch: 1 psi = 6,894.76 Pa, and a ksi is a thousand psi. For estimation, 1 MPa ≈ 0.145 ksi, or the more memorable reverse: 7 MPa is about 1 ksi.
A metric datasheet gives an aluminum alloy's yield strength as 276 MPa, and a US shop drawing calls for the value in ksi:
The alloy is 6061-T6 — whose US datasheet indeed lists 40 ksi yield. The two documents agree; only the units differ.
| MPa | ksi |
|---|---|
| 1 | 0.145 |
| 100 | 14.5 |
| 248 | 36 |
| 276 | 40 |
| 690 | 100 |
| 1,000 | 145 |
This direction of the conversion serves everyone who designs in US customary units but sources from a metric world: an imported S355 beam must be understood as 51.5 ksi material before it can enter an AISC calculation, a metric fastener class 10.9 (1,000 MPa nominal) reads as a 145 ksi bolt, and pipeline steel graded X65 in one document appears as L450 (450 MPa) in another. Because the factor is awkward — 0.14504 invites neither mental math nor memorization — practitioners lean on landmark pairs instead: 250 MPa ≈ 36 ksi (mild steel), 690 MPa = 100 ksi (high-strength plate, the round number both systems share), 1,000 MPa = 145 ksi. These landmarks double as error detectors, since a slipped decimal produces strengths no engineering material exhibits. One further habit prevents subtle trouble: convert the final quantities, not intermediate ones. Repeatedly hopping between MPa and ksi inside a multi-step calculation accumulates rounding from the truncated 0.145, whereas a single conversion at the end keeps the full 0.1450377 precision of the defined factor.
To convert from megapascal (MPa) to Inch of mercury (inHg), use the following formula:
Inch of mercury (inHg)
= 1000 × 0.00014503768078 × 10.000491154× megapascal (MPa)
= 295.29980572284863811× megapascal (MPa)
With 0.00014503768078 is the ratio between the base units kilopound per square inch (ksi) and kilopascal (kPa).
If you've ever looked at engineering specifications, construction materials, or high-pressure equipment, you've likely seen the term 'MPa.'
A megapascal (MPa) is a unit of pressure in the metric system, equal to one thousand kilopascals (1000 kPa).
The plural form is megapascals.
The megapascal (MPa) is a fundamental unit for quantifying the strength of materials in engineering and construction.
It is commonly used to express a material's ultimate tensile strength (the maximum stress it can withstand while being pulled apart) and compressive strength (its resistance to being squeezed).
For example, structural steel might have a tensile strength of 400 MPa. In comparison, high-performance concrete can have a compressive strength exceeding 80 MPa.
Understanding how to convert megapascals to other pressure units is crucial for global applications.
Here are the most common conversions:
The pound per square inch (PSI) is a unit commonly used in the United States for measuring tire pressure and hydraulic systems.
The bar is a unit often used in Europe for weather forecasting and scuba diving.
Megapascals are used to describe immense pressures found in both natural and industrial settings.
The water pressure at the bottom of the Mariana Trench, the deepest point in the ocean, is about 108.6 MPa.
In industry, a high-pressure waterjet cutter operates at pressures ranging from 200 to 600 MPa, demonstrating enough force to slice through metal and stone.