UnitConvConvert
Pressure

Convert torr to atmospheres

1 Torr=0.001316atm

Use the converter below to change any torr value into atmospheres instantly — with formula, conversion table, and real-world examples.

0.0013158

Conversion formula

Forward
atmospheres = torr × 0.001316
Reverse
torr = atmospheres × 760

Example: 10 Torr × 0.001316 = 0.01316 atm.

About both units

From

Torr

Torr

The torr equals 1/760 atm — approximately 133.32 Pa. Essentially equivalent to mmHg but defined slightly differently. Used in vacuum-system engineering and older physics.

Real-world: Low-vacuum: 760 to 25 torr. High-vacuum: 10⁻³ to 10⁻⁹ torr. Semiconductor fabrication: often below 10⁻⁶ torr.
Read full torr reference →
To

Atmosphere

atm

The standard atmosphere equals 101,325 pascals exactly — defined by CGPM in 1954. Represents average sea-level atmospheric pressure. Used in chemistry, aviation and engineering as a reference pressure.

Real-world: Sea-level pressure: 1 atm. Mount Everest summit: ~0.33 atm. Submarine at 100 m: ~11 atm.
Read full atmosphere reference →

Torr to Atmosphere conversion table

Common torr to atmospheres values for quick reference.

Torr (Torr)Atmosphere (atm)
1 Torr0.001316 atm
5 Torr0.006579 atm
10 Torr0.01316 atm
25 Torr0.03289 atm
50 Torr0.06579 atm
100 Torr0.1316 atm
200 Torr0.2632 atm
500 Torr0.6579 atm
1,000 Torr1.31579 atm
5,000 Torr6.57895 atm

Tips & common mistakes

Quick tips

  • 1 Torr ≈ 1 mmHg (differ by ~1 ppm — negligible in practice).
  • 1 atm = 760 Torr exactly.
  • Named after Evangelista Torricelli, inventor of the barometer.

Avoid these

  • Assuming torr and mmHg are truly identical — they differ by ~10⁻⁷; only matters in metrology.
  • Using Torr in everyday context — obscure outside vacuum engineering.
  • Mixing Torr and mTorr without specification.

Frequently asked questions

How many atmospheres in a torr?
One torr equals 0.001316 atmospheres.
How do I convert torr to atmospheres?
Multiply the torr value by 0.001316 to get the equivalent in atmospheres.
What is 100 torr in atmospheres?
100 torr equals 0.1316 atmospheres.
Is a torr bigger than a atmosphere?
No. 1 torr equals 0.001316 atmospheres, so one torr is smaller.
How to convert torr to atmospheres without a calculator?
Multiply by 0 for a quick estimate; use a calculator for precise results.

Related pressure conversions

📊 See full comparison matrix →

More from Torr

Torr → Pa
1 = 133.322 Pa
Torr → kPa
1 = 0.1333 kPa
Torr → MPa
1 = 0.0001333 MPa
Torr → bar
1 = 0.001333 bar
Torr → mbar
1 = 1.33322 mbar
Torr → psi
1 = 0.01934 psi
Torr → mmHg
1 = 1 mmHg
Torr → inHg
1 = 0.03937 inHg

More to Atmosphere

Pa → atm
1 = 9.8692e-6 atm
kPa → atm
1 = 0.009869 atm
MPa → atm
1 = 9.86923 atm
bar → atm
1 = 0.9869 atm
mbar → atm
1 = 0.0009869 atm
psi → atm
1 = 0.06805 atm
mmHg → atm
1 = 0.001316 atm
inHg → atm
1 = 0.03342 atm

Conversions in other categories

WeightKilogram → PoundLengthKilometer → MileTemperatureCelsius → FahrenheitVolumeLiter → US GallonAreaSquare Meter → Square FootSpeedKilometer per Hour → Mile per HourEnergyKilojoule → KilocaloriePowerKilowatt → Mechanical Horsepower