In 1 pascals there are 7.500617 millitorr. Meanwhile in 1 millitorr there are 0.133322 pascals. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Millitorr to Pascals calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert pascals (Pa) to millitorr (mTorr), multiply the pressure in pascals by the Pa-to-mTorr conversion factor:
Example:
For the reverse check (millitorr to pascals), use:
These conversions are common in vacuum pressure work, where pascals are SI units and millitorr is often used for low-pressure readings.
A pascal (Pa) is the SI unit of pressure. It measures force per unit area (one newton per square meter). A millitorr (mTorr) is a smaller unit based on the torr, often used in vacuum work. One torr equals 1/760 of standard atmospheric pressure.
To convert Pa to mTorr, multiply the value in pascals by 7.500616827.
Formula:
mTorr = Pa × 7.500616827
1 Pa equals about 7.5006 mTorr.
This is a handy benchmark when you move between SI pressure and vacuum units.
1 mTorr equals about 0.133322 Pa.
Formula:
Pa = mTorr × 0.133322368
Using the standard definition (1 atm = 101,325 Pa and 1 torr = 1/760 atm):
For most lab and shop use, rounding to 7.5006 is fine.
A quick estimate is:
Example: 40 Pa ≈ 40 × 7.5 = 300 mTorr.
Here are a few common points:
mTorr is common in vacuum work because it gives simple numbers in the rough and high-vac ranges. Many gauges, pump specs, and process notes still use torr or millitorr. Pascals are standard in science and SI-based reports, so you may see both units side by side.
No. The conversion is a unit change only, so temperature doesn't change the math.
Temperature can change pressure in a real system (like a sealed chamber). That is a separate effect.
Millitorr is one-thousandth of a torr.
Match the precision of your measurement tool. Many vacuum gauges don’t support more than 2 to 4 significant digits. Over-rounding can hide real changes, but too many decimals can look more exact than your data.
Yes. Both units can describe absolute pressure. In vacuum work, values are usually absolute pressure (pressure above a perfect vacuum). If a reading is gauge pressure (relative to local air pressure), label it clearly before converting.
The Calculate Box tool to convert pascals to millitorr uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a pascals value in the box and have it instantly converted to millitorr.