Convert Bar to Millimeter of Mercury (bar → mmHg)
The bar is the everyday pressure unit in European tire pressures, hydraulics, and meteorology applications.
Bar to Millimeter of Mercury Conversion Table
10 common values| Bar | Millimeter of Mercury |
|---|---|
| 1 bar | 750.06158 mmHg |
| 5 bar | 3,750.3079 mmHg |
| 10 bar | 7,500.6158 mmHg |
| 25 bar | 18,751.539 mmHg |
| 50 bar | 37,503.079 mmHg |
| 100 bar | 75,006.158 mmHg |
| 200 bar | 150,012.32 mmHg |
| 500 bar | 375,030.79 mmHg |
| 1,000 bar | 750,061.58 mmHg |
| 5,000 bar | 3,750,307.9 mmHg |
How to Convert Bar to Millimeter of Mercury Manually
Step by StepConverting bars to millimeters of mercury is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.
- 1Take your value in barsStart with the number of bars (bar) you want to convert.
- 2Multiply by 750.06158The conversion factor from bar to mmHg is 750.06158. Multiply your value by this number.
- 3Read the result in millimeters of mercuryThe result is your value in millimeters of mercury (mmHg).
Formula
Multiply the value in bars by 750.06158. For the reverse direction, multiply by 0.001333.
mmHg = bar × 750.06158bar = mmHg × 0.001333Tips
Use these in everyday conversions- 1 bar = 100 kPa = 0.987 atm = 14.5 psi.
- Almost 1 atm — convenient approximation.
- Tyre pressures: 2.0–2.5 bar typical car, 6–10 bar truck.
Common Mistakes
Avoid these- Assuming 1 bar = 1 atm exactly — 1.3% off.
- Mixing bar with psi — need factor of 14.5.
- Using bar for high-pressure work — switch to MPa.
About Bar and Millimeter of Mercury
What is the Bar?
The bar equals exactly 100,000 pascals (100 kPa) and is the everyday pressure unit in European tire pressures, hydraulic systems, and meteorology. The unit was chosen to be approximately equal to atmospheric pressure at sea level (1 bar = 0.987 atm). European cars have tire pressures of about 2.0–2.5 bar (29–36 psi), industrial hydraulic systems operate at 100–700 bar, and wine bottles are pressurized to about 6 bar internally for sparkling wines. Although technically not an SI unit, the bar is widely accepted for use with the SI system. Weather forecasts in some countries use 'millibar' (1 mbar = 1 hPa = 100 Pa) for atmospheric pressure. The bar relates to the pascal (100,000 Pa = 1 bar), the kilopascal (100 kPa = 1 bar), the psi (1 bar ≈ 14.504 psi), the atmosphere (1 atm ≈ 1.013 bar), and the mbar (1,000 mbar = 1 bar). It strikes a practical balance between scientific precision and everyday usefulness.
- European tyre pressure gauges
- Scuba-diving depth pressure
- Hydraulic and pneumatic systems
Car tyre: 2.0–2.5 bar. SCUBA at 10 m depth: 2 bar absolute. Fire hose: 5–7 bar.
What is the Millimeter of Mercury?
The millimeter of mercury equals approximately 133.322 pascals and is the universal medical unit for blood pressure measurements worldwide. Normal blood pressure is around 120/80 mmHg (systolic/diastolic). The unit's origin is the manometer: a column of mercury rises 1 mm for every 133 Pa of pressure difference. Mercury barometers historically measured atmospheric pressure (760 mmHg = 1 atm at sea level). Beyond medicine, mmHg appears in vacuum-system specifications, certain laboratory contexts, and altimeter settings (in inHg in the US, in mmHg or hPa elsewhere). The mmHg relates to the torr (1 mmHg ≈ 1.0000003 torr — essentially identical), the pascal (1 mmHg ≈ 133.3 Pa), the atmosphere (760 mmHg = 1 atm), and inches of mercury (1 inHg = 25.4 mmHg). The unit's persistence in medicine reflects historical inertia and the precision of mercury manometers.
- Blood pressure measurement globally
- Vacuum-system specifications
- Historical scientific texts
Normal blood pressure: 120/80 mmHg. Atmospheric: 760 mmHg. Good vacuum: <1 mmHg.