Convert Torrs to Millitorr

Torrs

Accepts decimals and fractions, like 1.5 or 1 1/2.

Quick presets:

Keyboard shortcut: press S to swap units.

Millitorr

Round to 2 decimals

Contextual examples

1 Torrs = 1,000 Millitorr
10 Torrs = 10,000 Millitorr
100 Torrs = 100,000 Millitorr
1000 Torrs = 1,000,000 Millitorr

Millitorr to Torrs

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How many millitorr in a torrs?

In 1 torrs there are 1,000 millitorr. Meanwhile in 1 millitorr there are 0.001 torrs. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Torrs to Millitorr calculator above to convert any number.

* Values rounded for readability — use the calculator above for full precision

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Millitorr to Torrs Torrs to Pascals Pascals to Millitorr Torrs to Bars Bars to Millitorr Torrs to Atmospheres Atmospheres to Millitorr Torrs to Pounds per square inch

How does this converter work?

The Calculate Box tool to convert torrs to millitorr uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a torrs value in the box and have it instantly converted to millitorr.

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Convert Torrs to Millitorr

Convert torr to millitorr (mTorr) in seconds with a clear, accurate result. Enter any value in torr to get millitorr instantly for vacuum, lab, and pressure readings.

Torrs

Accepts decimals and fractions, like 1.5 or 1 1/2.

Quick presets:

Keyboard shortcut: press S to swap units.

Millitorr

Round to 2 decimals

Contextual examples

1 Torrs = 1,000 Millitorr
10 Torrs = 10,000 Millitorr
100 Torrs = 100,000 Millitorr
1000 Torrs = 1,000,000 Millitorr

Millitorr to Torrs

Swap

How many millitorr in a torrs?

* Values rounded for readability — use the calculator above for full precision

How to convert torrs to millitorr?

To convert torr to millitorr (mTorr), use the milli- prefix rule. Milli means 1/1,000 of the base unit, so 1 mTorr = 0.001 Torr. That also means 1 Torr = 1,000 mTorr.

Conversion formula (Torr to mTorr):

mTorr = Torr × 1,000

Quick examples:

0.5 Torr = 0.5 × 1,000 = 500 mTorr
2 Torr = 2 × 1,000 = 2,000 mTorr
0.001 Torr = 0.001 × 1,000 = 1 mTorr

Tip: When converting torr to millitorr, you’re moving to a smaller unit, so the number gets bigger by 1,000 times.

Frequently asked questions

What is the conversion from torr to millitorr (mTorr)?

1 torr equals 1,000 millitorr.
To convert torr to mTorr, multiply the torr value by 1,000.

How do you convert torr to millitorr?

Use this formula:
mTorr = torr × 1,000
Example: 0.25 torr × 1,000 = 250 mTorr.

Why does 1 torr equal 1,000 millitorr?

Millitorr means one-thousandth of a torr. The prefix "milli-" equals 0.001. So one torr contains 1,000 millitorr.

Is mTorr the same as micron?

In vacuum work, 1 mTorr is often called 1 micron (short for micron of mercury). The values match:
1 micron = 1 mTorr.

What are torr and millitorr used for?

Torr and millitorr measure pressure, most often for vacuum levels. You’ll see them in HVAC, lab equipment, coating systems, and vacuum pumps.

Are torr and mmHg the same?

They are very close, but not identical by strict definition. In most practical uses, 1 torr is treated as equal to 1 mmHg. For everyday calculations, the difference is usually too small to matter.

Can torr and millitorr be used for absolute pressure?

Yes. Torr and mTorr can describe absolute pressure when referenced to a perfect vacuum. Many vacuum gauges report pressure in torr or mTorr as absolute values.

What’s a quick mental shortcut for torr to mTorr?

Move the decimal three places to the right, then add zeros if needed.

2 torr = 2,000 mTorr
0.08 torr = 80 mTorr
0.003 torr = 3 mTorr

How do you convert millitorr back to torr?

Use the reverse formula:
torr = mTorr ÷ 1,000
Example: 750 mTorr ÷ 1,000 = 0.75 torr.

What are common torr to millitorr conversions?

1 torr = 1,000 mTorr
0.1 torr = 100 mTorr
0.01 torr = 10 mTorr
0.001 torr = 1 mTorr
5 torr = 5,000 mTorr

Related calculators

Use these next if you want similar conversions or tools.

Millitorr to Torrs Torrs to Pascals Pascals to Millitorr Torrs to Bars Bars to Millitorr Torrs to Atmospheres Atmospheres to Millitorr Torrs to Pounds per square inch