How to Convert Bar to Millimetres of mercury (bar to mmHg)
Pressure conversions are used for tyre pressure (psi or bar), blood pressure readings in mmHg and weather maps in millibars. This guide shows how to convert bar into millimetres of mercury by hand, with examples and a quick-reference table.
The conversion
To convert bar to millimetres of mercury, multiply the value by 750.0637554192. To go the other way, divide by the same number (or multiply by 0.00133322). For a quick estimate, multiply by about 750.
Millimetres of mercury = bar × 750.0637554192
Worked examples
- 3 bar = 2,250.19 mmHg
- 12.5 bar = 9,375.8 mmHg
- 75 bar = 56,254.78 mmHg
Bar to Millimetres of mercury table
| Bar | Millimetres of mercury |
|---|---|
| 1 bar | 750.0638 mmHg |
| 2 bar | 1,500.13 mmHg |
| 5 bar | 3,750.32 mmHg |
| 10 bar | 7,500.64 mmHg |
| 20 bar | 15,001.28 mmHg |
| 25 bar | 18,751.59 mmHg |
| 50 bar | 37,503.19 mmHg |
| 100 bar | 75,006.38 mmHg |
| 250 bar | 187,515.94 mmHg |
| 500 bar | 375,031.88 mmHg |
| 1,000 bar | 750,063.76 mmHg |
Common questions
Is bar to mmHg exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Millimetres of mercury to Bar converter.
Mistakes to avoid
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Background
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the Bar to Millimetres of mercury Converter or browse all pressure converters.
Run your own numbers: Bar to Millimetres of mercury Converter