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Megapascal to Millimeter of Mercury Converter

Convert megapascals to millimeters of mercury with our free online pressure converter.

Quick Answer

1 Megapascal = 7500.616827 millimeters of mercury

Formula: Megapascal × conversion factor = Millimeter of Mercury

Use the calculator below for instant, accurate conversions.

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All conversion formulas on UnitsConverter.io have been verified against NIST (National Institute of Standards and Technology) guidelines and international SI standards. Our calculations are accurate to 10 decimal places for standard conversions and use arbitrary precision arithmetic for astronomical units.

Last verified: February 2026Reviewed by: Sam Mathew, Software Engineer

Megapascal to Millimeter of Mercury Calculator

How to Use the Megapascal to Millimeter of Mercury Calculator:

  1. Enter the value you want to convert in the 'From' field (Megapascal).
  2. The converted value in Millimeter of Mercury will appear automatically in the 'To' field.
  3. Use the dropdown menus to select different units within the Pressure category.
  4. Click the swap button (⇌) to reverse the conversion direction.
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How to Convert Megapascal to Millimeter of Mercury: Step-by-Step Guide

Converting Megapascal to Millimeter of Mercury involves multiplying the value by a specific conversion factor, as shown in the formula below.

Formula:

mmHg = MPa × 7500.62

Example Calculation:

1 MPa = 7500.616827 mmHg

Disclaimer: For Reference Only

These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.

Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.

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What is a Megapascal and a Millimeter of Mercury?

1 MPa = 1,000,000 Pa = 1,000 kPa = 145.038 PSI = 10 bar = 9.869 atm

Why Megapascal?

MPa is the "sweet spot" for engineering pressures:

  • Pascal is too small: 1 Pa = barely measurable (atmospheric is 101,325 Pa)
  • Kilopascal is too granular: Engineering specs in kPa are 4-5 digit numbers (20,000 kPa for concrete)
  • MPa is optimal: Concrete 20-40 MPa (simple, memorable)
  • Engineering standard: All material specs given in MPa
  • SI-derived: ISO and international standards use MPa

The millimeter of mercury (symbol: mmHg) is a manometric unit of pressure.

The Physical Definition: It is defined as the pressure exerted at the base of a column of mercury exactly 1 millimeter high at a temperature of 0°C (32°F) under standard gravity.

Relation to SI Units: 1 mmHg ≈ 133.322387415 Pascals.

mmHg vs. Torr: While the terms are often used interchangeably, there is a tiny technical difference:

  • Torr is defined as exactly 1/760 of a standard atmosphere.
  • mmHg is based on the physical properties of mercury.
  • The difference is roughly 0.000015%. For all medical, engineering, and everyday purposes, 1 mmHg = 1 Torr.

Key standard relationships:

  • 1 mmHg = 1 Torr
  • 760 mmHg = 1 standard atmosphere (atm)
  • 1 mmHg ≈ 1.333 millibars (mbar)
  • 1 mmHg ≈ 0.0193 PSI

Note: The Megapascal is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Millimeter of Mercury belongs to the imperial/US customary system.

History of the Megapascal and Millimeter of Mercury

: Torricelli and the Liquid Silver

The mmHg is one of the oldest measurement units still in daily use.

1. The Invention of the Barometer (1643)

Before 1643, people believed suction "pulled" water up pipes. Evangelista Torricelli proved this was wrong. He filled a tube with mercury (which is much heavier than water) and saw it settle at 76 cm. He realized it wasn't a pull, but a "push" from the weight of the invisible atmosphere.

2. Why Mercury?

Mercury was chosen because it is the only metal that is liquid at room temperature and is extremely dense (13.6 times heavier than water). If Torricelli had used water, his barometer would have needed to be over 34 feet (10 meters) tall to measure the same atmospheric weight!

3. The Move to Absolute Values

In the mid-20th century, scientists realized that a "millimeter" of mercury actually weighed more in some places than others (due to gravity differences). To fix this, the Torr was created as a fixed mathematical fraction of an atmosphere, while the mmHg remained as the descriptive name for the liquid measurement.

Common Uses and Applications: megapascals vs millimeters of mercury

Explore the typical applications for both Megapascal (imperial/US) and Millimeter of Mercury (imperial/US) to understand their common contexts.

Common Uses for megapascals

Materials Engineering: Tensile strength, compressive strength, yield strength - THE standard unit for all material properties. Hydraulics: High-pressure hydraulic systems (construction, manufacturing, heavy equipment). Pressure Vessels: Gas cylinders, boilers, reactors, automotive fuel systems. Geotechnical: Soil bearing capacity, rock strength, foundation design. Aerospace: Structural requirements, component ratings.

Material Strengths (Compressive/Tensile)

Understanding material strength is critical for engineering design:

| Material | Type | Strength (MPa) | Notes | |---|---|---|---| | Styrofoam | Compression | 0.01-0.1 | Very weak, insulation only | | Wood (softwood) | Compression | 20-40 | Pine, spruce, fir typical | | Wood (hardwood) | Compression | 40-60 | Oak, maple stronger | | Brick | Compression | 10-40 | Varies by firing temperature | | Concrete (standard) | Compression | 20-40 | Common 28-day strength | | Concrete (high-strength) | Compression | 50-100 | Pre-stressed applications | | Granite | Compression | 100-250 | Very strong, suitable for columns | | Aluminum alloy (6061) | Tensile | 200-300 | Common structural aluminum | | Aluminum alloy (7075) | Tensile | 500-600 | High-strength aerospace | | Steel (structural ASTM A36) | Yield | 250 | Common building steel | | Steel (high-strength ASTM A572) | Yield | 345-450 | Bridge, crane applications | | Steel (ultra-high) | Tensile | 500-1,000 | Special applications | | Steel cable (wire rope) | Tensile | 1,600-2,000 | Elevators, suspension bridges | | Carbon fiber composite | Tensile | 3,000-7,000 | Aerospace, racing | | Kevlar fiber | Tensile | 3,600-3,800 | Armor, protective gear |

Design factor: Actual working stress = material strength ÷ safety factor (typically 2-4)

Hydraulic Systems (High Pressure)

Hydraulic pressure ratings define system capability:

| System Type | Operating Pressure | Peak Pressure | PSI Equivalent | Application | |---|---|---|---|---| | Automotive brake | 10-15 MPa | 20 MPa | 1,500-2,900 PSI | Car braking force | | Automobile power steering | 10-15 MPa | 20 MPa | 1,500-2,900 PSI | Steering assist | | Construction excavator | 20-35 MPa | 40 MPa | 2,900-5,800 PSI | Digging bucket | | Backhoe | 25-30 MPa | 35 MPa | 3,625-5,075 PSI | Heavy lifting | | Dump truck bed | 20-25 MPa | 30 MPa | 2,900-4,350 PSI | Lifting load | | Industrial press | 20-40 MPa | 50 MPa | 2,900-7,250 PSI | Metal forming | | Hydraulic jack | 50-70 MPa | 80 MPa | 7,250-11,600 PSI | Lifting capability | | Water jet cutter | 200-400 MPa | 450 MPa | 29,000-65,000 PSI | Material cutting | | Oil well pump | 100-200 MPa | 250 MPa | 14,500-36,250 PSI | Deep well pressure |

Pressure Vessels & Storage

Pressure ratings determine safe working limits:

| Vessel Type | Typical Pressure | Material | Working PSIG | |---|---|---|---| | Compressed air tank | 0.8-1.0 MPa | Steel | 116-145 PSI | | Propane BBQ tank | 1.5-2.0 MPa | Steel | 218-290 PSI | | Scuba tank (full) | 20-30 MPa | Aluminum/Steel | 3,000-4,350 PSI | | Natural gas vehicle | 20-25 MPa | Composite | 3,000-3,625 PSI | | Hydrogen fuel cell | 35-70 MPa | Carbon fiber | 5,000-10,000 PSI | | Industrial gas cylinder | 15-20 MPa | Steel | 2,175-2,900 PSI | | Medical oxygen | 13.8-15 MPa | Aluminum | 2,000-2,175 PSI | | Nitrogen (instrument) | 10-13.8 MPa | Steel | 1,450-2,000 PSI |

Safety factor: Pressure vessels typically designed with 4:1 to 6:1 safety margin

Geotechnical Engineering (Soil/Rock)

Foundation and excavation design based on pressure ratings:

| Material/Condition | Bearing Capacity | Suitable For | Notes | |---|---|---|---| | Soft clay | 0.05-0.2 MPa | Temporary structures | High settlement risk | | Medium clay | 0.1-0.3 MPa | Single story | Careful design needed | | Stiff clay | 0.3-0.5 MPa | Multi-story buildings | Good load capacity | | Dense sand | 0.3-0.6 MPa | Foundation base | Excellent for building | | Gravel/sand mixture | 0.6-1.0 MPa | Heavy structures | Very good bearing | | Soft rock (shale) | 1-10 MPa | Bridge supports | Rock analysis needed | | Medium rock | 10-50 MPa | Tall buildings | High capacity | | Hard rock (granite) | 50-100+ MPa | Largest structures | Excellent foundation |

Design process: Site investigation → soil tests → pressure capacity → foundation design

When to Use millimeters of mercury

Additional Unit Information

About Megapascal (MPa)

How do I convert MPa to PSI?

Formula: PSI = MPa × 145.038

Examples:

  • 1 MPa = 145 PSI
  • 10 MPa = 1,450 PSI (car brakes)
  • 20 MPa = 2,900 PSI (hydraulic tools)
  • 30 MPa = 4,350 PSI (scuba tank)
  • 70 MPa = 10,153 PSI (H2 fuel tank)

MPa to PSI converter →

What is concrete strength in MPa?

Residential concrete: 20-32 MPa (2,900-4,650 PSI)

  • Footings/slabs: 20-25 MPa
  • Foundation walls: 25-30 MPa
  • Driveway: 25-32 MPa

Commercial concrete: 30-50 MPa

  • Floors: 30-35 MPa
  • Beams/columns: 35-50 MPa

High-strength: 50-100+ MPa

  • High-rise buildings: 50-80 MPa
  • Bridges: 60-100 MPa
  • Special applications: 100-150 MPa

Conversion: Divide PSI by 145 to get MPa (e.g., 3,000 PSI ≈ 21 MPa)

How do I convert MPa to bar?

Formula: bar = MPa × 10

Examples:

  • 0.1 MPa = 1 bar
  • 1 MPa = 10 bar
  • 2 MPa = 20 bar
  • 10 MPa = 100 bar
  • 20 MPa = 200 bar (scuba tank)

MPa to Bar converter →

What is a typical hydraulic system pressure?

Low pressure: 7-14 MPa (1,000-2,000 PSI)

  • Automotive power steering: 8-12 MPa
  • Light hydraulic lifts: 7-10 MPa

Medium pressure: 14-21 MPa (2,000-3,000 PSI)

  • Construction equipment: 20-25 MPa
  • Agricultural machinery: 14-20 MPa
  • Automotive brakes: 10-15 MPa

High pressure: 21-35 MPa (3,000-5,000 PSI)

  • Industrial presses: 25-35 MPa
  • Heavy construction: 30-35 MPa
  • Excavators: 30-35 MPa

Very high pressure: >35 MPa (>5,000 PSI)

  • Hydraulic jacks: 50-70 MPa
  • Specialized industrial: 70-100 MPa

Why use MPa instead of PSI for material strength?

SI standard: International engineering uses MPa universally Simpler numbers: 400 MPa vs 58,000 PSI Scientific: Consistent with stress calculations (force/area in N/m²) Global: Specifications understood worldwide

Conversion: PSI ÷ 145 ≈ MPa (or PSI × 0.00689 = MPa)

Example: Steel yield strength

  • As MPa: 250-400 MPa (easy)
  • As PSI: 36,000-58,000 PSI (unwieldy)

About Millimeter of Mercury (mmHg)

What is normal blood pressure in mmHg?

120/80 mmHg is considered normal adult blood pressure

120 mmHg (systolic):

  • Pressure in arteries when heart beats/contracts
  • Upper number in blood pressure reading

80 mmHg (diastolic):

  • Pressure in arteries when heart rests between beats
  • Lower number in blood pressure reading

Blood pressure categories (American Heart Association):

  • Normal: <120/<80 mmHg
  • Elevated: 120-129/<80 mmHg
  • Stage 1 Hypertension: 130-139/80-89 mmHg
  • Stage 2 Hypertension: ≥140/90 mmHg
  • Hypertensive Crisis: >180/120 mmHg (seek emergency care)

How do I convert mmHg to PSI?

Formula: PSI = mmHg × 0.0193368

Examples:

  • 120 mmHg = 2.32 PSI (systolic blood pressure)
  • 80 mmHg = 1.55 PSI (diastolic blood pressure)
  • 760 mmHg = 14.7 PSI (atmospheric pressure)
  • 100 mmHg = 1.93 PSI
  • 10 mmHg = 0.19 PSI

mmHg to PSI converter →

Why is blood pressure measured in mmHg?

Historical: Early sphygmomanometers (blood pressure cuffs) used mercury columns Standardization: Established globally since early 1900s Accuracy: Mercury barometers very accurate and reliable Consistency: Changing units would cause confusion in medical field Universal: Understood by doctors, nurses, patients worldwide

Modern devices: Digital monitors still display mmHg for consistency, even though they don't use actual mercury.

Why not change?:

  • Medical literature, guidelines all use mmHg
  • Training and education based on mmHg
  • Patient familiarity (everyone knows "120 over 80")
  • Risk of errors during transition period

What is the difference between mmHg and Torr?

Virtually identical: 1 mmHg ≈ 1 Torr (difference < 0.000015%)

mmHg (Millimeter of Mercury):

  • Based on mercury density at 0°C, standard gravity
  • Slightly temperature/gravity dependent
  • Preferred in medicine (blood pressure)

Torr:

  • Defined as exactly 1/760 atmosphere
  • Independent of mercury properties
  • Preferred in vacuum technology, physics

Practical usage: Treat them as equal—difference is negligible for all practical purposes.

Conversion: 1 mmHg = 1.000000142 Torr (effectively 1:1)

mmHg to Torr converter →

How many mmHg is 1 atmosphere?

1 atm = 760 mmHg (exactly, by definition)

This is the height of mercury column supported by atmospheric pressure at sea level.

Examples:

  • 0.5 atm = 380 mmHg
  • 1 atm = 760 mmHg (sea level)
  • 2 atm = 1,520 mmHg (diving 10m deep)
  • 3 atm = 2,280 mmHg (diving 20m deep)

Altitude effect:

  • Sea level: 760 mmHg
  • Denver (1,609m): ~630 mmHg
  • La Paz, Bolivia (3,640m): ~480 mmHg
  • Mount Everest (8,848m): ~253 mmHg

Atmosphere to mmHg converter →

Will medicine switch from mmHg to kPa?

Slow transition, likely decades away (if ever)

Current status:

  • Still dominant: Most medical equipment worldwide uses mmHg
  • Some countries transitioning: Australia, Canada partially adopted kPa
  • Dual display: Modern monitors often show both mmHg and kPa
  • Guidelines: International medical guidelines still primarily use mmHg

Challenges to switching:

  • Familiarity: "120/80" universally understood
  • Education: Medical training globally uses mmHg
  • Communication: Doctor-patient communication simpler with mmHg
  • Standards: Hypertension thresholds defined in mmHg
  • Risk: Potential for medication errors during transition

Conversion: 120/80 mmHg = 16.0/10.7 kPa (less intuitive)

Prediction: mmHg likely to persist in medicine for foreseeable future despite SI adoption elsewhere.

Conversion Table: Megapascal to Millimeter of Mercury

Megapascal (MPa)Millimeter of Mercury (mmHg)
0.53,750.308
17,500.617
1.511,250.925
215,001.234
537,503.084
1075,006.168
25187,515.421
50375,030.841
100750,061.683
2501,875,154.207
5003,750,308.414
1,0007,500,616.827

People Also Ask

How do I convert Megapascal to Millimeter of Mercury?

To convert Megapascal to Millimeter of Mercury, enter the value in Megapascal in the calculator above. The conversion will happen automatically. Use our free online converter for instant and accurate results. You can also visit our pressure converter page to convert between other units in this category.

Learn more →

What is the conversion factor from Megapascal to Millimeter of Mercury?

The conversion factor depends on the specific relationship between Megapascal and Millimeter of Mercury. You can find the exact conversion formula and factor on this page. Our calculator handles all calculations automatically. See the conversion table above for common values.

Can I convert Millimeter of Mercury back to Megapascal?

Yes! You can easily convert Millimeter of Mercury back to Megapascal by using the swap button (⇌) in the calculator above, or by visiting our Millimeter of Mercury to Megapascal converter page. You can also explore other pressure conversions on our category page.

Learn more →

What are common uses for Megapascal and Millimeter of Mercury?

Megapascal and Millimeter of Mercury are both standard units used in pressure measurements. They are commonly used in various applications including engineering, construction, cooking, and scientific research. Browse our pressure converter for more conversion options.

For more pressure conversion questions, visit our FAQ page or explore our conversion guides.

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All Pressure Conversions

Pascal to KilopascalPascal to MegapascalPascal to HectopascalPascal to BarPascal to MillibarPascal to AtmospherePascal to Technical AtmospherePascal to TorrPascal to Millimeter of MercuryPascal to Inch of MercuryPascal to Pound per Square InchPascal to Kilopound per Square InchPascal to Kilogram-force per Square CentimeterPascal to Kilogram-force per Square MeterPascal to Millimeter of Water ColumnPascal to Inch of Water ColumnKilopascal to PascalKilopascal to MegapascalKilopascal to HectopascalKilopascal to BarKilopascal to MillibarKilopascal to AtmosphereKilopascal to Technical AtmosphereKilopascal to TorrKilopascal to Millimeter of MercuryKilopascal to Inch of MercuryKilopascal to Pound per Square InchKilopascal to Kilopound per Square InchKilopascal to Kilogram-force per Square CentimeterKilopascal to Kilogram-force per Square MeterKilopascal to Millimeter of Water ColumnKilopascal to Inch of Water ColumnMegapascal to PascalMegapascal to KilopascalMegapascal to HectopascalMegapascal to BarMegapascal to MillibarMegapascal to AtmosphereMegapascal to Technical AtmosphereMegapascal to TorrMegapascal to Inch of MercuryMegapascal to Pound per Square InchMegapascal to Kilopound per Square InchMegapascal to Kilogram-force per Square CentimeterMegapascal to Kilogram-force per Square MeterMegapascal to Millimeter of Water ColumnMegapascal to Inch of Water ColumnHectopascal to PascalHectopascal to KilopascalHectopascal to MegapascalHectopascal to BarHectopascal to MillibarHectopascal to AtmosphereHectopascal to Technical AtmosphereHectopascal to TorrHectopascal to Millimeter of MercuryHectopascal to Inch of MercuryHectopascal to Pound per Square InchHectopascal to Kilopound per Square InchHectopascal to Kilogram-force per Square CentimeterHectopascal to Kilogram-force per Square MeterHectopascal to Millimeter of Water ColumnHectopascal to Inch of Water ColumnBar to PascalBar to KilopascalBar to MegapascalBar to HectopascalBar to MillibarBar to AtmosphereBar to Technical AtmosphereBar to TorrBar to Millimeter of MercuryBar to Inch of MercuryBar to Pound per Square InchBar to Kilopound per Square InchBar to Kilogram-force per Square CentimeterBar to Kilogram-force per Square MeterBar to Millimeter of Water ColumnBar to Inch of Water ColumnMillibar to PascalMillibar to KilopascalMillibar to MegapascalMillibar to HectopascalMillibar to BarMillibar to AtmosphereMillibar to Technical AtmosphereMillibar to TorrMillibar to Millimeter of MercuryMillibar to Inch of MercuryMillibar to Pound per Square InchMillibar to Kilopound per Square InchMillibar to Kilogram-force per Square CentimeterMillibar to Kilogram-force per Square MeterMillibar to Millimeter of Water ColumnMillibar to Inch of Water ColumnAtmosphere to PascalAtmosphere to KilopascalAtmosphere to MegapascalAtmosphere to HectopascalAtmosphere to BarAtmosphere to MillibarAtmosphere to Technical AtmosphereAtmosphere to TorrAtmosphere to Millimeter of MercuryAtmosphere to Inch of MercuryAtmosphere to Pound per Square InchAtmosphere to Kilopound per Square InchAtmosphere to Kilogram-force per Square CentimeterAtmosphere to Kilogram-force per Square MeterAtmosphere to Millimeter of Water ColumnAtmosphere to Inch of Water ColumnTechnical Atmosphere to PascalTechnical Atmosphere to KilopascalTechnical Atmosphere to MegapascalTechnical Atmosphere to HectopascalTechnical Atmosphere to BarTechnical Atmosphere to MillibarTechnical Atmosphere to AtmosphereTechnical Atmosphere to TorrTechnical Atmosphere to Millimeter of Mercury

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Verified Against Authority Standards

All conversion formulas have been verified against international standards and authoritative sources to ensure maximum accuracy and reliability.

NIST Reference on Constants, Units and Uncertainty

National Institute of Standards and Technology — Fundamental physical constants and unit conversions

BIPM SI Units

Bureau International des Poids et Mesures — International System of Units (SI) definitions and standards

ISO 80000

International Organization for Standardization — Quantities and units international standards series

Last verified: February 19, 2026