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Pressure

Convert millimeters of mercury to psi

1 mmHg=0.01934psi

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

0.019337

Conversion formula

Forward
psi = millimeters of mercury × 0.01934
Reverse
millimeters of mercury = psi × 51.7149

Example: 10 mmHg × 0.01934 = 0.1934 psi.

About both units

From

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 →
To

Pound per Square Inch

psi

Pounds per square inch equals approximately 6895 Pa. It is the dominant pressure unit in the US — tyre pressures, plumbing, compressed air. Standard US tyre pressure: 32–35 psi.

Real-world: US tyre: 32–35 psi. Water supply: 40–60 psi. SCUBA tank: 3000 psi. Car AC system: 30–200 psi.
Read full pound per square inch reference →

Millimeter of Mercury to Pound per Square Inch conversion table

Common millimeters of mercury to psi values for quick reference.

Millimeter of Mercury (mmHg)Pound per Square Inch (psi)
1 mmHg0.01934 psi
5 mmHg0.09668 psi
10 mmHg0.1934 psi
25 mmHg0.4834 psi
50 mmHg0.9668 psi
100 mmHg1.93368 psi
200 mmHg3.86736 psi
500 mmHg9.66839 psi
1,000 mmHg19.3368 psi
5,000 mmHg96.6839 psi

Tips & common mistakes

Quick tips

  • 1 mmHg ≈ 133.32 Pa ≈ 1 Torr.
  • 760 mmHg = 1 atm.
  • Blood-pressure cuffs display mmHg worldwide.

Avoid these

  • Confusing mmHg with mmH₂O (different unit, factor of 13.6).
  • Mixing mmHg with torr in precise vacuum physics — they differ by one part per million.
  • Writing blood pressure in kPa — use mmHg for medical continuity.

Frequently asked questions

How many psi in a millimeter of mercury?
One millimeter of mercury equals 0.01934 psi.
How do I convert millimeters of mercury to psi?
Multiply the millimeter of mercury value by 0.01934 to get the equivalent in psi.
What is 100 millimeters of mercury in psi?
100 millimeters of mercury equals 1.93368 psi.
Is a millimeter of mercury bigger than a pound per square inch?
No. 1 millimeter of mercury equals 0.01934 psi, so one millimeter of mercury is smaller.
How to convert millimeters of mercury to psi without a calculator?
Multiply by 0.02 for a quick estimate; use a calculator for precise results.

Related pressure conversions

📊 See full comparison matrix →

More from Millimeter of Mercury

mmHg → Pa
1 = 133.322 Pa
mmHg → kPa
1 = 0.1333 kPa
mmHg → MPa
1 = 0.0001333 MPa
mmHg → bar
1 = 0.001333 bar
mmHg → mbar
1 = 1.33322 mbar
mmHg → atm
1 = 0.001316 atm
mmHg → Torr
1 = 1 Torr
mmHg → inHg
1 = 0.03937 inHg

More to Pound per Square Inch

Pa → psi
1 = 0.000145 psi
kPa → psi
1 = 0.145 psi
MPa → psi
1 = 145.038 psi
bar → psi
1 = 14.5038 psi
mbar → psi
1 = 0.0145 psi
atm → psi
1 = 14.6959 psi
Torr → psi
1 = 0.01934 psi
inHg → psi
1 = 0.4912 psi

Conversions in other categories

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