How To Convert Bar to Torr
Formula: torr = bar × 750.061683
Example: Convert 2.5 bar to torr.
2.5 × 750.061683 = 1875.154208 torr
To convert by hand, take your value in bar and multiply it by 750.061683.
If your calculator shows many digits, round to a sensible number of decimals for your work.
This is a direct pressure conversion, so there are no extra steps like temperature corrections.
Quick Answer
1 bar = 750.061683 torr
- 0.5 bar = 375.030842 torr
- 1.2 bar = 900.074020 torr
- 3 bar = 2250.185049 torr
Conversion Formula
torr = bar × 750.061683
This means torr is a smaller unit than bar. So when you convert from bar to torr, the number gets bigger.
The multiplier 750.061683 comes from the official definitions of both units in pascals, then dividing one by the other.
- Start with the pressure value in bar.
- Multiply it by 750.061683.
- The result is the same pressure in torr.
Bar
A bar is a metric unit of pressure equal to exactly 100,000 pascals (Pa). The symbol is bar.
It became popular in weather and engineering because it is close to normal atmospheric pressure. It is widely used in Europe for many pressure readings.
- Weather and atmospheric pressure reporting (often in millibars)
- Tire pressure and air compressors (in some regions)
- Industrial hydraulics and pneumatics
- Diving and scuba tank pressure
- Pressure regulators and valves
Torr
A torr is a unit of pressure defined as 1/760 of a standard atmosphere. The symbol is Torr (often written as torr).
The name comes from Evangelista Torricelli, linked to early experiments in pressure and vacuum. Torr is still common in vacuum science and older lab instruments.
- Vacuum pump specifications
- Vacuum chambers and leak testing
- Thin film coating and sputtering systems
- Semiconductor and cleanroom process tools
- Laboratory pressure gauges and manometers
Is this Conversion of Bar To Torr Accurate?
Yes. This conversion is based on standard, fixed definitions. One bar is defined exactly as 100,000 Pa. One torr is defined exactly as 101,325/760 Pa, which equals 133.32236842105263 Pa.
When you divide 100,000 Pa by 133.32236842105263 Pa, you get 1 bar = 750.061683 torr. This is the same basis used in engineering references and scientific work. For how we handle rounding and standards, see our accuracy standards.
Real Life Examples
Bar is common in engineering, while torr is common in vacuum work. Here are realistic examples where you may need to switch between them.
- Vacuum chamber reading: A chamber is at 0.01 bar. That is 0.01 × 750.061683 = 7.500617 torr, useful when your gauge displays torr.
- Leak test spec sheet: A procedure requires staying below 15 torr. In bar, that is 15 ÷ 750.061683 = 0.019998 bar (about 0.02 bar).
- Roughing pump performance: A pump reaches 0.2 bar. That equals 0.2 × 750.061683 = 150.012337 torr.
- Process setpoint in a coating system: You set 3.5 bar on a pressure controller for a test. In torr, that is 3.5 × 750.061683 = 2625.215891 torr.
- Compressed gas regulator comparison: A regulator rated to 6 bar corresponds to 6 × 750.061683 = 4500.370098 torr when comparing to older documentation that uses torr.
- Calibration cross check: A reference states 760 torr is near atmospheric pressure. In bar, that is 760 ÷ 750.061683 = 1.013250 bar, matching the idea that 1 atm is slightly above 1 bar.
- Safety limit on a vessel: A label shows 1.8 bar max. In torr, that is 1.8 × 750.061683 = 1350.111029 torr.
Quick Tips
- Going from bar to torr, the number increases because torr is a smaller unit.
- Use torr = bar × 750.061683 for best accuracy.
- For quick estimates, you can think 1 bar ≈ 750 torr, then refine if needed.
- If you have torr and need bar, divide by 750.061683.
- Keep the same decimal places that match your instrument accuracy, not more.
- For vacuum work, always note whether specs are in torr, mbar, or Pa to avoid mistakes.