Convert Pascals to Millitorr

To convert pascals (Pa) to millitorr (mTorr), multiply the pressure in pascals by the Pa-to-mTorr conversion factor:

• 1 Pa = 7.500616827 mTorr
• Formula: mTorr = Pa × 7.500616827

Example:

• 20 Pa × 7.500616827 = 150.01233654 mTorr

For the reverse check (millitorr to pascals), use:

• 1 mTorr = 0.1333223684 Pa
• Formula: Pa = mTorr × 0.1333223684

These conversions are common in vacuum pressure work, where pascals are SI units and millitorr is often used for low-pressure readings.

What is the Pascal (Pa) and what is millitorr (mTorr)?

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.

How do you convert pascals to millitorr?

To convert Pa to mTorr, multiply the value in pascals by 7.500616827.

Formula:
mTorr = Pa × 7.500616827

What is 1 Pa in millitorr?

1 Pa equals about 7.5006 mTorr.

This is a handy benchmark when you move between SI pressure and vacuum units.

What is 1 mTorr in pascals?

1 mTorr equals about 0.133322 Pa.

Formula:
Pa = mTorr × 0.133322368

What is the exact conversion factor between Pa and mTorr?

Using the standard definition (1 atm = 101,325 Pa and 1 torr = 1/760 atm):

• 1 torr = 133.322368421... Pa
• 1 mTorr = 0.133322368421... Pa
• 1 Pa = 7.500616827... mTorr

For most lab and shop use, rounding to 7.5006 is fine.

How many millitorr are in a pascal (quick mental math)?

A quick estimate is:

• mTorr ≈ Pa × 7.5

Example: 40 Pa ≈ 40 × 7.5 = 300 mTorr.

What are common Pa to mTorr conversions?

Here are a few common points:

• 0.1 Pa = 0.7501 mTorr
• 1 Pa = 7.5006 mTorr
• 10 Pa = 75.0062 mTorr
• 100 Pa = 750.0617 mTorr
• 1,000 Pa = 7,500.6168 mTorr
• 101,325 Pa (1 atm) = 760,000 mTorr

Why do vacuum systems use mTorr instead of pascals?

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.

Does temperature affect the Pa to mTorr conversion?

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.

What’s the difference between torr and millitorr?

Millitorr is one-thousandth of a torr.

• 1 torr = 1,000 mTorr
• 500 mTorr = 0.5 torr

How should you round Pa to mTorr results?

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.

Are Pa and mTorr absolute pressure units?

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.