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Torr to Atmospheres Converter

Convert torr to atmospheres and atmospheres to torr instantly. Bidirectional pressure converter with formula and common values.

Torr

Atmospheres

1

atm

760 Torr = 1 atm

atm = Torr × 0.00131579

Torr to Atmospheres: 1 Torr equals 0.001316 atm. To convert torr to atmospheres, multiply by 0.001316 (atm = Torr × 0.00131579). For example, 10 Torr = 0.013158 atm.

How to Convert Torr to Atmospheres

To convert from torr to atmospheres, multiply the value by 0.001316. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Torr to Atmospheres: atm = Torr × 0.00131579
  • Atmospheres to Torr: Torr = atm ÷ 0.00131579

Torr to Atmospheres Conversion Chart

Torr (Torr)Atmospheres (atm)
0.10.000132
0.250.000329
0.50.000658
10.001316
20.002632
30.003947
50.006579
100.013158
200.026316
250.032895
500.06579
1000.131579
2500.328948
10001.31579

Understanding the Units

What is a Torr?

One torr equals exactly 1/760 of a standard atmosphere, or about 133.322 pascals — close to one millimeter of mercury.

Named after Evangelista Torricelli (1608–1647), inventor of the barometer.

Common contexts: vacuum technology, medical blood pressure.

What is an Atmosphere?

A standard atmosphere equals exactly 101,325 pascals — defined as the average atmospheric pressure at sea level.

Common contexts: chemistry, reference conditions.

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FAQ

What is torr and how is it related to mmHg?

Torr is a unit of pressure named after physicist Evangelista Torricelli. One torr is approximately equal to one millimeter of mercury (mmHg). The exact definition is 1 torr = 101,325/760 Pa.

How many torr are in one atmosphere?

Exactly 760 torr equals one standard atmosphere. This value originates from the height of a mercury column (760 mm) that atmospheric pressure supports at sea level.

Where is torr commonly used?

Torr is primarily used in vacuum science, laboratory settings, and blood pressure measurement (as mmHg). High-vacuum systems often operate in the millitorr or microtorr range.

What is a good vacuum in torr?

Low vacuum ranges from 760 to 25 torr. Medium vacuum is 25 to 0.001 torr. High vacuum is below 0.001 torr (1 millitorr). Ultra-high vacuum systems reach below 10⁻⁹ torr.

How many atmospheres are in 1 torr?

1 Torr equals 0.001316 atm.

How do you convert torr to atmospheres?

Multiply the torr value by 0.001316. Formula: atm = Torr × 0.00131579.

How many atmospheres are in 5 torr?

5 Torr = 0.006579 atm.

How do you convert atmospheres back to torr?

Use the inverse formula: Torr = atm ÷ 0.00131579. For example, 1 atm = 759.999696 Torr.

What is the difference between Torr and Atmospher?

One torr equals exactly 1/760 of a standard atmosphere, or about 133.322 pascals — close to one millimeter of mercury. A standard atmosphere equals exactly 101,325 pascals — defined as the average atmospheric pressure at sea level.