How To Convert Torr to Millibar
Formula: millibar (mbar) = torr × 1.3332236842105263
Example: 120 torr × 1.3332236842105263 = 159.98684210526316 mbar
To convert by hand, take your Torr value and multiply it by 1.3332236842105263.
This works because both units are pressure units tied to fixed standards.
If you need a quick estimate, you can multiply by about 1.333, then refine if needed.
Quick Answer
1 torr = 1.3332236842105263 mbar
- 10 torr = 13.332236842105263 mbar
- 50 torr = 66.66118421052631 mbar
- 760 torr = 1013.25 mbar
Conversion Formula
mbar = torr × 1.3332236842105263
torr = mbar ÷ 1.3332236842105263
This number comes from exact definitions used in science:
- 1 atmosphere (atm) = 101,325 pascals (Pa), exactly
- 1 torr = 1/760 atm, exactly
- 1 millibar (mbar) = 100 Pa, exactly
So, 1 torr = (101,325 ÷ 760) Pa = 133.32236842105263 Pa, and dividing by 100 Pa per mbar gives 1.3332236842105263 mbar.
- Write down the pressure in torr.
- Multiply it by 1.3332236842105263.
- The result is the same pressure in millibar (mbar).
Torr
A torr is a unit of pressure equal to 1/760 of a standard atmosphere. The symbol is Torr or torr.
It is named after Evangelista Torricelli, who helped develop early pressure measurement using mercury. Torr became common in vacuum science because it matches older barometer based measurements.
- Vacuum pump and vacuum chamber readings
- Laboratory thin film coating systems
- Semiconductor process tools
- Plasma and ion source equipment
- Pressure specs on scientific instruments
Millibar
A millibar is a unit of pressure equal to 1/1000 of a bar. The symbol is mbar.
The bar came from metric pressure units, and millibar became popular in weather reports and aviation. Today, meteorology often uses hPa, which is equal to mbar (1 hPa = 1 mbar).
- Weather and sea level pressure reports
- Aviation altimeter and pressure settings
- Industrial vacuum gauges (many show mbar)
- HVAC testing and duct pressure checks
- Environmental and climate data logging
Is this Conversion of Torr To Millibar Accurate?
Yes. This converter uses pressure definitions that are fixed and widely accepted in science and engineering. The key links are exact: 1 atm is defined as 101,325 Pa, 1 torr is defined as 1/760 of an atm, and 1 mbar is defined as 100 Pa. Because these reference values are exact, the conversion factor 1 torr = 1.3332236842105263 mbar is reliable for study, lab work, and general use.
For more details about our reference values and standards, read our methodology on accuracy standards.
Real Life Examples
Here are practical situations where you may need to switch between torr and millibar.
- Vacuum chamber setpoint: A process recipe calls for 15 torr. In millibar that is 15 × 1.3332236842105263 = 19.998355263157894 mbar.
- Rough vacuum reading: A gauge shows 2 torr. That equals 2 × 1.3332236842105263 = 2.6664473684210526 mbar.
- Leak test requirement: Your limit is 0.5 torr. That is 0.5 × 1.3332236842105263 = 0.6666118421052631 mbar.
- Weather pressure comparison: Standard sea level pressure is 1013.25 mbar. In torr that is 1013.25 ÷ 1.3332236842105263 = 760 torr.
- Vacuum oven operation: You run an oven at 100 torr. That equals 100 × 1.3332236842105263 = 133.32236842105263 mbar.
- Instrument spec sheet: A sensor range is 300 torr. In millibar it is 300 × 1.3332236842105263 = 399.9671052631579 mbar.
- Process step conversion: A step is listed as 600 torr. That equals 600 × 1.3332236842105263 = 799.9342105263158 mbar.
Quick Tips
- Fast estimate: multiply torr by 1.333 to get mbar.
- Mental math trick: 1.333 is close to 4/3, so mbar ≈ torr × 4 ÷ 3.
- Reverse estimate: torr ≈ mbar × 0.75.
- Exact reverse factor: 1 mbar = 0.750061683017704 torr.
- For high accuracy, keep more decimals when converting small pressures.
- If your device rounds to 0.1 mbar, do not over interpret extra decimals.