In 1 atmospheres there are 760,000 millitorr. Meanwhile in 1 millitorr there are 0.00000131579 atmospheres. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Millitorr to Atmospheres calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert atmospheres (atm) to millitorr (mTorr), use a fixed pressure conversion. Millitorr is written as mTorr.
Conversion factor:
Formula (atm to mTorr):
Quick examples:
This atm to mTorr conversion is used in pressure work tied to atmospheric (barometric) pressure and vacuum readings.
1 atmosphere (atm) equals 760,000 millitorr (mTorr).
Use this conversion:
Divide by 760,000:
The value comes from standard atmospheric pressure at sea level. It matches the pressure that supports a 760 mm column of mercury in a barometer, which is 760 torr.
A millitorr is one-thousandth of a torr:
No. They measure the same thing (pressure) but use different units.
Multiply by 760,000:
Multiply by 760,000:
Divide by 760,000:
It depends on the system and goal.
No. The unit conversion is fixed by definition. Temperature can change the pressure in a real system, but 1 atm still equals 760,000 mTorr.
They can be used as absolute units, but the meaning depends on the reference.
Use 760,000 mTorr per atm.
For a fast estimate, treat it as about 0.76 million mTorr per atm.
Standard atmospheric pressure is:
The Calculate Box tool to convert atmospheres to millitorr uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a atmospheres value in the box and have it instantly converted to millitorr.