Convert Torr to Megapascal (Torr → MPa)

Converting torr to megapascals is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in torr

   Start with the number of torr (Torr) you want to convert.
2. 2
   Multiply by 0.000133

   The conversion factor from Torr to MPa is 0.000133. Multiply your value by this number.
3. 3
   Read the result in megapascals

   The result is your value in megapascals (MPa).

Multiply the value in torr by 0.000133. For the reverse direction, multiply by 7,500.6168.

• ✓1 Torr ≈ 1 mmHg (differ by ~1 ppm — negligible in practice).
• ✓1 atm = 760 Torr exactly.
• ✓Named after Evangelista Torricelli, inventor of the barometer.

• ✗Assuming torr and mmHg are truly identical — they differ by ~10⁻⁷; only matters in metrology.
• ✗Using Torr in everyday context — obscure outside vacuum engineering.
• ✗Mixing Torr and mTorr without specification.

What is the Torr?

The torr equals approximately 1.0000003 mmHg (essentially identical, 133.322 Pa) and is named after Italian physicist Evangelista Torricelli (1608–1647), who invented the mercury barometer. The torr is widely used in vacuum-system specifications, laboratory instruments, and high-vacuum physics. Vacuum levels are categorized: 'low vacuum' is 760 to 1 torr, 'medium vacuum' 1 to 10⁻³ torr, 'high vacuum' below 10⁻³ torr. Mass spectrometers, electron microscopes, and semiconductor manufacturing systems require high vacuum (10⁻⁶ to 10⁻⁹ torr). The torr relates to the mmHg (essentially equal), the pascal (1 torr ≈ 133.3 Pa), the millibar (1 torr ≈ 1.333 mbar), and the atmosphere (760 torr = 1 atm). Modern scientific publications increasingly use the pascal, but the torr remains entrenched in vacuum technology.

• Vacuum-chamber pressure readings
• Semiconductor manufacturing
• Older physics literature

What is the Megapascal?

The megapascal equals 1,000,000 pascals (or 10 bar) and is the engineering high-pressure unit used in hydraulics, materials testing, and construction. Concrete compressive strength is rated in MPa (typical residential concrete is 20–35 MPa, structural concrete 35–70 MPa, high-strength up to 140 MPa), and steel yield strengths are 250–700 MPa for structural grades. Hydraulic systems operate at 10–70 MPa, and high-pressure-water-jet cutting reaches 400 MPa. The megapascal is dimensionally identical to N/mm² (newtons per square millimeter), making it natural for engineering calculations involving small areas. Earth's mantle pressure reaches gigapascals (1 GPa = 1,000 MPa). The MPa relates to the pascal (10⁶ Pa = 1 MPa), the bar (10 bar = 1 MPa), the psi (1 MPa ≈ 145.04 psi), and the atmosphere (1 MPa ≈ 9.87 atm). It is the standard unit in modern engineering specifications worldwide.

• Hydraulic system pressures
• Concrete and steel strength specifications
• High-pressure industrial processes