In 1 millitorr there are 0.00000133322 bars. Meanwhile in 1 bars there are 750,061.682704 millitorr. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Bars to Millitorr calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert millitorr (mTorr) to bar, use a simple pressure conversion factor.
bar = mTorr × 1.33322368421 × 10⁻⁶
If you have 1 mTorr:
1 mTorr × 1.33322368421 × 10⁻⁶ = 0.00000133322368421 bar
Use this method any time you need a millitorr to bar conversion for vacuum pressure, lab work, or engineering values.
A millitorr (mTorr) is a unit of pressure. It equals one-thousandth of a torr. The torr comes from standard atmospheric pressure and is common in vacuum work.
A bar is a metric unit of pressure. Many fields use it for weather, industrial systems, and engineering. One bar is close to normal air pressure at sea level (but not the same).
Use this conversion:
This works because 1 torr equals about 0.00133322 bar, and 1 mTorr is 0.001 torr.
The conversion factor is:
There are about:
This is useful when you need to switch from bar to very low vacuum readings.
760,000 mTorr equals 760 torr (since 1,000 mTorr = 1 torr). Then:
This value is close to standard atmospheric pressure.
mTorr fits low-pressure ranges better. Vacuum readings often sit far below 1 bar. Using mTorr avoids long decimals and makes changes easier to see.
mTorr can be used as absolute pressure, but it depends on the gauge and the setup. Many vacuum gauges report absolute pressure, while some systems reference pressure to local air pressure. Check your instrument label and method.
You can use the decimal form:
Example:
It depends on your use. For lab notes, 3 to 6 significant digits often works well. For tight process control, match the precision of your gauge and reporting rules.
They are close but not always identical in strict terms. In most vacuum and lab use, torr and mmHg are treated as equal for practical work. When you need high accuracy, use the exact definition of your standard.
You may also see:
These units often appear in vacuum specs, pump ratings, and gas system data sheets.
The Calculate Box tool to convert millitorr to bars uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a millitorr value in the box and have it instantly converted to bars.