How To Convert Torr to Bar
Formula: 1 torr = 0.0013332236842105263 bar.
Example: Convert 450 torr to bar.
450 × 0.0013332236842105263 = 0.5999506578947369 bar.
To convert manually, you multiply the torr value by a fixed number. That fixed number is the bar value of 1 torr. This works because both units measure the same thing, pressure, just on different scales.
If you want to go the other way, you would divide by the same number. For quick checks, rounding can help, but keep the full value when accuracy matters.
Quick Answer
1 torr = 0.0013332236842105263 bar
- 10 torr = 0.013332236842105262 bar
- 100 torr = 0.13332236842105263 bar
- 760 torr = 1.01325 bar
Conversion Formula
bar = torr × 0.0013332236842105263
This formula means you take your pressure in torr and multiply it by 0.0013332236842105263 to get the same pressure in bar. The number 0.0013332236842105263 is fixed because it comes from standard definitions of pressure units.
- Write down the pressure in torr.
- Multiply it by 0.0013332236842105263.
- The result is the pressure in bar.
Torr
A torr is a unit of pressure based on standard atmosphere, where 760 torr equals 1 atmosphere. The symbol is torr.
The name comes from Evangelista Torricelli, linked to early barometer work. The unit became common in vacuum science because it is convenient for low pressures.
- Vacuum chambers and vacuum pumps
- Thin film coating systems
- Electron microscopes and research instruments
- Laboratory pressure readings
- Older vacuum gauges and datasheets
Bar
A bar is a metric unit of pressure, close to atmospheric pressure, where 1 bar equals 100,000 pascals. The symbol is bar.
The bar became popular in engineering because it gives easy-to-read numbers for many real pressures. It is widely used in weather, industry, and technical specifications.
- Weather and atmospheric pressure reports (often in mbar or hPa)
- Tire pressure and compressed air systems (sometimes shown as bar)
- Industrial hydraulics and pneumatics
- Scuba and diving tank pressure (often bar)
- Pressure regulators and valves in equipment specs
Is this Conversion of Torr To Bar Accurate?
Yes. This conversion uses the standard relationship between torr and standard atmosphere, and the standard definition of bar as exactly 100,000 pascals. Since 1 atmosphere equals exactly 1.01325 bar and 760 torr equals 1 atmosphere, the factor 0.0013332236842105263 bar per torr follows directly. This is the same basis used across engineering references, textbooks, and scientific tools, so the result is reliable for lab work and general calculations. For more details on how we choose and verify constants, see our accuracy standards.
Real Life Examples
Here are practical situations where converting torr to bar helps you understand pressure quickly.
- Vacuum oven setting: A vacuum oven runs at 50 torr. That is 50 × 0.0013332236842105263 = 0.06666118421052632 bar, which is far below atmospheric pressure.
- Desiccator evacuation: Your lab gauge shows 200 torr in a desiccator. That equals 0.26664473684210526 bar, useful when comparing to a pump spec written in bar.
- Process coating system: A coating recipe requires 5 torr during a step. That is 0.0066661184210526315 bar, helping you match a controller that displays bar.
- Leak check comparison: A chamber rises to 20 torr during a leak check. That equals 0.026664473684210525 bar, making it easier to compare with a report that uses bar.
- Old datasheet vs new gauge: A pump sheet lists performance at 100 torr, which is 0.13332236842105263 bar. Your new digital gauge reads bar, so you can compare directly.
- Near-atmosphere reference: Standard atmospheric pressure is 760 torr, which equals 1.01325 bar. This helps you sanity-check your conversions.
- Partial pressure in experiments: A gas is introduced to 300 torr in a vessel. That equals 0.3999671052631579 bar, useful when total pressure limits are stated in bar.
Quick Tips
- For a fast estimate, use 1 torr ≈ 0.00133 bar.
- 760 torr always equals 1.01325 bar, a good checkpoint.
- To convert bar back to torr, divide by 0.0013332236842105263.
- Keep more digits when working with vacuum levels, small changes matter.
- Write the unit after every number to avoid mixing torr, mbar, and bar.
- If your gauge shows mbar, remember 1 bar = 1000 mbar.