Pressure conversion factors

 

To convert

Pa

hPa

kPa

Bar

mbar

mm Hg

psi

atm

torr

mtorr

ins. water

cm. water

 

 

 

 

 

 

 

 

 

 

 

 

to

 

 

 

 

 

 

 

 

 

 

 

Pa

Multiply

by

 

1

100

1000

100,000

100

133.322

6894.757

101325

133.28

0.133328

249.0889

98.0665

hPa

0.01

1

10

1000

1

1.33322

68.947 57

1013.25

1.3332

0.001333

2.490889

0.98066

kPa

0.001

0.1

1

100

0.1

0.133322

6.894757

101.325

0.13332

0.0001333

0.2490889

0.09806

Bar

0.00001

0.001

0.01

1

0.001

0.001333

0.068948

1.01325

1.3328

x10-3

1.3328

x10-6

2.489

x10-3

0.000981

mbar

0.01

1

10

1000

1

1.33312

68.948

1013.250

1.33322

1.3328

x10-3

2.489

0.980665

mm Hg

0.007500 615

0.750006

7.500615

750.0615

0.75006

1

51.72

760.000

1.00000

0.0001

1.868 320

0.73555

psi

1.4504

x10-4

0.014 504

0.145038

14.503774

1.450

x10-2

0.019337

1

14.696

0.019337

1.934

x10-5

3.612

x 10-2

0.0142233

atm

9.8693

×10-6

9.986923

x10-4

0.009 869

0.98692

0.986923

x10-4

0.001315

0.068046

1

1.3158

x10-3

1.316

x10-6

2.458

x10-3

9.678

x10-4

torr

7.5006

x10-3

0.75006

7.50067

750.2838

0.75028

1.000000

51.715

760

1

0.001

1.868

0.73556

mtorr

7.5006

750.06

7500.617

7.5028

x10-5

750.28

1000.0001

51710

760000

1000

1

1.868

x10-3

73.5530

ins water

4.01463

x10-3

0.401 463

4.01463

401.65

0.4018

0.53524

27.708

406.86

0.5353

5.353

x10-4

1

0.393700

cm water

0.0102

1.01972

10.1972

1019.716

1.01972

1.35951

70.3069

1033.228

1.35951

0.0013595

2.539999

1

Notes:
A large number of units are used to measure pressure. Only a limited number are given here. The S.I.unit of pressure is the Pascal, Pa.
The Standard Atmosphere (atm) is an international reference pressure defined as 101325 Pa. In practice it has been replaced by the Bar.
The Technical Atmosphere (symbol: at) is a non-SI unit of pressure equal to one kg force per square centimeter. 1at = 0.96784 atm.
1 Pa = 1 N/m2 = 10−5 bar  = 10.197×10−6 at  = 9.8692×10 −6 atm.
No responsibility is taken for accuracy of the above conversion factors. Please forward any corrections to andy@cpd-dynamics.co.uk