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CalcChef

Pressure Unit Converter

Convert pressure between Pa, hPa, kPa, MPa, bar, psi, atm, Torr, mmHg, inHg and inH2O. 1 atm = 101,325 Pa = 14.6959 psi = 760 Torr. How it works

Use the Pressure Unit Converter

Result
0.000145038 psi
From 1 Pa

1 Pascal ≈ 0.000145038 Pounds per square inch

Pascal — Common Use

SI unit of pressure. Used in scientific research, material testing, and engineering. 1 Pa = 1 N/m².

All units

Pa1
hPa0.01
kPa0.001
MPa0.000001
bar0.00001
psi0.000145038
atm0.00000986923
Torr0.00750062
mmHg0.00750062
inHg0.0002953
inH2O0.00401463

Reference

About the Pressure Unit Converter

1 atm is 101,325 Pa, 1,013.25 hPa, 1.01325 bar, 14.6959 psi, 760 Torr and 29.9213 inHg. The converter changes any of eleven pressure units, inches of water included, into any other by passing through the pascal, and it keeps Torr and mmHg as two separate units.

One standard atmosphere in each unit

Unit1 atm equals
Pascal (Pa)101325
Hectopascal (hPa)1013.25
Kilopascal (kPa)101.325
Megapascal (MPa)0.101325
Bar1.01325
Pounds per square inch (psi)14.6959
Atmosphere (atm)1
Torr760
Millimeters of mercury (mmHg)760
Inches of mercury (inHg)29.9213
Inches of water (inH2O)406.782

Shown to six significant digits with trailing zeros dropped, the way the converter prints them, which is why mmHg also reads 760 (it is 759.99989).

Common psi values in kPa, bar and atm

psikPabaratm
1068.94760.6894760.68046
15103.4211.034211.02069
20137.8951.378951.36092
30206.8432.068432.04138
32220.6322.206322.17747
35241.3162.413162.38161
40275.792.75792.72184
50344.7383.447383.4023
60413.6854.136854.08276
80551.5815.515815.44368
100689.4766.894766.8046

1 psi = 6,894.757 Pa, the factor the converter uses. Multiply psi by 6.894757 for kPa.

How to use this tool

  1. Type a value in the From box and pick its unit, or type in the To box to work backward.
  2. Pick the To unit. The line under the boxes shows what 1 of the From unit equals, and the All units panel lists the value in all eleven units.
  3. Use a quick button (sea level, car tire, bike tire, SCUBA tank, 1 Torr) or a row of the reference table to load a typical value.

Frequently asked questions

How many psi is 1 bar?
1 bar is 14.5038 psi, and 1 psi is 0.0689476 bar. A 2.2 bar tire pressure is 31.9083 psi, and 32 psi is 2.20632 bar.
Is 1 Torr the same as 1 mmHg?
Not exactly. The torr is defined as 1/760 of a standard atmosphere, 101325/760 Pa or 133.3224 Pa, while 1 mmHg is 133.322387 Pa, about 1.00000014 Torr. The gap is roughly 1.4 parts in ten million, so the converter shows 1 mmHg as 1 Torr at six digits but keeps the two factors apart.
How do I convert psi to kPa?
Multiply by 6.894757. 32 psi is 220.632 kPa and 100 psi is 689.476 kPa. To go back, divide kPa by 6.894757.
How many hPa is standard sea-level pressure?
1013.25 hPa, which is 1 atm, 101.325 kPa and 29.9213 inHg. One hectopascal is one millibar, 100 Pa. A reading of 29.92 inHg is 1013.21 hPa.
What is 120/80 mmHg in kPa?
120 mmHg is 15.9987 kPa and 80 mmHg is 10.6658 kPa. 1 kPa is 7.50062 mmHg. This is a unit conversion only, and the converter does not interpret a blood pressure reading.
What is the difference between psig and psia?
Gauge pressure (psig) is measured from the air around you, so a gauge reads 0 at ambient pressure; absolute pressure (psia) is measured from a vacuum. Absolute = gauge + atmospheric. A 32 psig tire at sea level is 32 + 14.6959 = 46.6959 psia, or 321.957 kPa absolute. Tire and blood pressures are gauge readings by convention. The converter changes units only and never adds the atmosphere, so convert gauge to gauge and absolute to absolute.

Where each pressure unit turns up

Tire gauges read psi in the US and bar or kPa in much of Europe: 32 psi is 220.632 kPa or 2.20632 bar. Weather reports use hPa, mbar or inHg, and US altimeter settings are in inHg: 1013.25 hPa is 29.9213 inHg. Blood pressure is quoted in mmHg, vacuum work in Torr, and hydraulics in MPa or bar. Duct static pressure, manometers and gas appliance specs use inches of water: 1 psi is 27.6799 inH2O. The All units panel lists all eleven units.

The converter changes the unit only. It does not add atmospheric pressure, so 32 psig stays gauge: 2.20632 bar gauge. Absolute pressure at sea level is 32 + 14.6959 = 46.6959 psia. It does not check a gauge, a tank rating or a medical reading.

Everything goes through the pascal

result = value × (Pa per from-unit) ÷ (Pa per to-unit)

The pascals per unit the tool uses:

  • 1 hPa = 100 Pa, 1 kPa = 1,000 Pa, 1 MPa = 1,000,000 Pa

  • 1 bar = 100,000 Pa

  • 1 psi = 6,894.757 Pa

  • 1 atm = 101,325 Pa

  • 1 Torr = 101325/760 Pa = 133.3224 Pa

  • 1 mmHg = 133.322387 Pa

  • 1 inHg = 3,386.389 Pa

  • 1 inH2O = 249.08891 Pa, the conventional inch of water (25.4 mm × 9.80665 Pa per mm)

Example: 32 psi × 6,894.757 ÷ 100,000 = 2.20632 bar.

Results show six significant digits in plain notation, so 1 Pa is 0.000145038 psi, never 1.45038e-4. The inHg factor is NIST's conventional inch of mercury; NIST lists 3,386.38 Pa for 32 °F, so inHg results can differ from other sources in the sixth digit.

Fun Fact: One atmosphere is exactly 760 Torr, because the torr is defined as 1/760 of a standard atmosphere. It is about 759.99989 mmHg: a millimeter of mercury is 1.00000014 Torr, so the two units differ by roughly 1.4 parts in ten million.

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