UnitConvConvert
Pressure

Convert torr to millimeters of mercury

1 Torr=1mmHg

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

1

Conversion formula

Forward
millimeters of mercury = torr × 1
Reverse
torr = millimeters of mercury × 1

Example: 10 Torr × 1 = 10 mmHg.

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

Millimeter of Mercury

mmHg

The millimetre of mercury equals about 133.3 Pa — the pressure exerted by a 1 mm column of mercury at 0 °C under standard gravity. Traditionally and still used in medicine: blood pressure of 120/80 mmHg.

Real-world: Normal blood pressure: 120/80 mmHg. Atmospheric: 760 mmHg. Good vacuum: <1 mmHg.
Read full millimeter of mercury reference →

Torr to Millimeter of Mercury conversion table

Common torr to millimeters of mercury values for quick reference.

Torr (Torr)Millimeter of Mercury (mmHg)
1 Torr1 mmHg
5 Torr5 mmHg
10 Torr10 mmHg
25 Torr25 mmHg
50 Torr50 mmHg
100 Torr100 mmHg
200 Torr200 mmHg
500 Torr500 mmHg
1,000 Torr1,000 mmHg
5,000 Torr5,000 mmHg

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 millimeters of mercury in a torr?
One torr equals 1 millimeters of mercury.
How do I convert torr to millimeters of mercury?
Multiply the torr value by 1 to get the equivalent in millimeters of mercury.
What is 100 torr in millimeters of mercury?
100 torr equals 100 millimeters of mercury.
Is a torr bigger than a millimeter of mercury?
No. 1 torr equals 1 millimeters of mercury, so one torr is smaller.
How to convert torr to millimeters of mercury without a calculator?
Multiply by 1 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 → atm
1 = 0.001316 atm
Torr → inHg
1 = 0.03937 inHg

More to Millimeter of Mercury

Pa → mmHg
1 = 0.007501 mmHg
kPa → mmHg
1 = 7.50062 mmHg
MPa → mmHg
1 = 7,500.62 mmHg
bar → mmHg
1 = 750.062 mmHg
mbar → mmHg
1 = 0.7501 mmHg
psi → mmHg
1 = 51.7149 mmHg
atm → mmHg
1 = 760 mmHg
inHg → mmHg
1 = 25.4 mmHg

Conversions in other categories

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