Conversions of pressure or stress units

Pressure conversion p = F / A = force divided by area
The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m²).
This program converts English and American measures to metric units
pascal (Pa) 
 millibars (mbar) = hectopascals (hPa) 
 psi - pounds per square inch (lb/sq in) 
bar (bar) 
atmosphere (atm) 
torr (torr) 
Standard atmospheric pressure is 101,325 pascals = 1,013.25 hPa = 101.325 kPa
Important to know: 1 Pa = 1 N/m294 dBSPL and 1 bar = 105 Pa
1 kPa = 103 Pa = 1000 Pa = 1000 N/m2154 dBSPL
Pressure = force / area       p = F / A
Please enter two values, the third value will be calculated.
 Pressure p  Pa = N / m² Magisches Dreieck Ohm
Force F  N
Area A 
Pressure units conversion chart
Sorted from low to high
Pressure or mechanical stress unit, p Symbol Definition Relation to SI unit pascal, Pa = N/m²
pascal (metric SI unit) Pa ≡ N/m² = kg/(m·s²)
       
barye (cgs unit) - ≡ 1 dyn/cm² = 0.1 Pa
poundal per square foot pdl/sq ft ≡ 1 pdl / ft² ≈ 1.488 164 Pa
millimetre of water (3.98 °C) mmH2O ≈ 999.972 kg/m³ × 1 mm × g = 9.806 38 Pa (= 0.999972 kgf/m²)
pound per square foot psf ≡ 1 lbf / ft² ≈ 47.880 259 Pa
centimetre of water (3.98 °C) cmH2O ≈ 999.972 kg/m³ × 1 cm × g = 98.0638 Pa
torr torr ≡ 101 325 / 760 Pa ≈ 133.322 368 4 Pa
millimetre of mercury mmHg ≡ 13595.1 kg/m³ × 1 mm × g ≈ 1 torr = 133.322 387 415 Pa
inch of water (3.98 °C) inH2O ≈ 999.972 kg/m³ × 1 in × g = 249.082 Pa
pièze (mts unit) pz ≡ 1000 kg / m·s² = 1 kPa
centimetre of mercury cmHg ≡ 13 595.1 kg / m³ × 1 cm × g = 1.333 223 874 15 kPa
foot of water (3.98 °C) ftH2O ≈ 999.972 kg / m³ × 1 ft × g = 2.988 98 kPa
inch of mercury inHg ≡ 13 595.1 kg / m³ × 1 in × g = 3.386 388 640 341 kPa
pound per square inch psi ≡ 1 lbf / 1 in² ≈ 6.894 757 kPa
foot of mercury ftHg ≡ 13 595.1 kg/m³ × 1 ft × g = 40.636 663 684 091 9 kPa
short ton per square foot - ≡ 1 sh tn × g / 1 ft² ≈ 95.760 518 kPa
atmosphere (technical) atm ≡ 1 kgf / cm² = 98.0665 kPa
bar bar - ≡105 Pa = 100 000 Pa
atmosphere (standard) atm - ≡101 325 Pa
kip per square inch ksi ≡ 1 kipf / in² ≈ 6.894757 MPa
kilogram-force per square millimetre kgf/mm² ≡ 1 kgf / mm² = 9.806 65 MPa

Unit Equivalent energy measures
Pounds per square inch
(psi, PSI, lb/in2, lb/sq in)
Commonly used in the U.S., but not elsewhere. Normal atmospheric pressure is 14.7 psi, which means that a column of air one square inch in area rising from the Earth's surface up to space weighs 14.7 pounds.
Atmosphere
(atm)
Normal atmospheric pressure is defined as 1 atmosphere. 1 atm = 14.6956 psi = 760 torr.
Torr
(torr)
Based on the original Torricelli barometer design, one atmosphere of pressure will force the column of mercury (Hg) in a mercury barometer to a height of 760 millimeters. A pressure that causes the Hg column to rise 1 millimeter is called a torr (you may still see the term 1 mm Hg used; this has been replaced by the torr). 1 atm = 760 torr = 14.7 psi.
Bar
(bar)
The bar is nearly identical to the atmosphere unit. One bar = 750.062 torr = 0.9869 atm = 100,000 Pa.
Millibar
(mb or mbar)
There are 1,000 millibar in one bar. This unit is used by meteorologists who find it easier to refer to atmospheric pressures without using decimals. One millibar = 0.001 bar = 0.750 torr = 100 Pa.
Pascal
(Pa)
1 pascal = a force of 1 Newton per square meter. 1 Newton is the force required to accelerate 1 kilogram one meter per second per second = 1 kg · m/s2; this is actually quite logical for physicists and engineers. 1 pascal = 10 dyne/cm 2 = 0.01 mbar. 1 atm = 101,325 Pascals = 760 mm Hg = 760 torr = 14.7 psi.
Kilopascal
(kPa)
The prefix "kilo" means "1,000", so one kilopascal = 1,000 Pa. Therefore, 101.325 kPa = 1 atm = 760 torr and 100 kPa = 1 bar = 750 torr.
Megapascal
(MPa)
The prefix "mega" means "1,000,000", so one megapascal = 1,000 kPa = 1,000,000 Pa. Such high pressures are rarely encounterd.
Gigapascal
(GPa)
The prefix "giga" means "1,000,000,000", so one gigapascal = 1,000 MPa = 1,000,000 kPa = 1,000,000,000 Pa = 9,870 atm = 10,000 bar. Pressures of several gigapascals can convert graphite to diamond or make hydrogen a metallic conductor.
Conversion chart
Pressure, temperature and standard height (altitude or elevation)
Values in "standard atmosphere"
  Elevation      Temperature        Air Pressure
        (feet)         (degrees °C)     (millibar = hPa)

      0               15.0             1013.25
   500             14.0              995
 1,000             13.0              977
 1,500             12.0              959
 2,000             11.0              942
 2,500             10.0              925
 3,000              9.1              908
 3,500              8.1              891
 4,000              7.1              875
 4,500              6.1              859
 5,000              5.1              843
 5,500              4.1              827
 6,000              3.1              812
 6,500              2.1              797
 7,000              1.1              782
 7,500              0.1              767
 8,000             -0.9              752
 8,500             -1.8              738
 9,000             -2.8              724
 9,500             -3.8              710
 10,000             -4.8              697 
 10,500             -5.8              683 
 11,000             -6.8              670 
 11,500             -7.8              657 
 12,000             -8.8              644 
 12,500             -9.8              632 
 13,000            -10.8              619 
 13,500            -11.8              607 
 14,000            -12.7              595 
 14,500            -13.7              583 
 15,000            -14.7              572 
 15,500            -15.7              560 
 16,000            -16.7              549 
 16,500            -17.7              538 
 17,000            -18.7              527 
 17,500            -19.7              516 
 18,000            -20.7              506 
 18,500            -21.7              495 
 19,000            -22.7              485 
 19,500            -23.6              475 
 20,000            -24.6              465 
 20,500            -25.6              456 
 21,000            -26.6              446 
21,500            -27.6              437
22,000            -28.6              428
22,500            -29.6              419
23,000            -30.6              410
23,500            -31.6              401
24,000            -32.6              392
24,500            -33.6              384
25,000            -34.5              376
25,500            -35.5              368
26,000            -36.5              360
26,500            -37.5              352
27,000            -38.5              344
27,500            -39.5              336
28,000            -40.5              329
28,500            -41.5              322
29,000            -42.5              315
29,500            -43.5              307
30,000            -44.5              301
30,500            -45.4              294
31,000            -46.4              287
31,500            -47.4              281
32,000            -48.4              274
32,500            -49.4              268
33,000            -50.4              262
33,500            -51.4              256
34,000            -52.4              250
34,500            -53.4              244
35,000            -54.4              238
35,500            -55.4              232
36,000            -56.3              225
36,500            -57.3              219
37,000            -58.3              213
37,500            -59.3              207
38,000            -60.3              200
38,500            -61.3              194
39,000            -62.3              188
39,500            -63.3              182
40,000            -64.3              176

Air pressure depends on temperature and indirectly on altitude
Pascal (Pa) is the metric SI unit of pressure and the standard pressure unit in the MKS metric system, equal to one newton
per square meter or one "kilogram per meter per second per second." Sounds impressive, but in traditional English
terms a pascal is only 0.000 145 pounds per square inch (0.020 885 lbf/ft2 or 0.007 50 mmHg). Thus pressure is more
commonly measured in kilopascals (kPa), with 1 kPa = 0.145 lbf/in2. Air pressure is also measured in hectopascals (hPa),
with 1 hPa = 1 millibar. The unit is named after Blaise Pascal (1623 - 1662), French philosopher and mathematician,
who was the first person to use a barometer to measure differences in altitude.

1 Pa = 1 N/m2
  10 µbar
  10 dynes/cm2

1 µbar = 0.1 N/m2
  0.1 Pa
  1 dynes/cm2
 
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