Conversion Factors for Units of Stress and Pressure (Small Units)
Metric Units
British Units
Millibar
(mb)
Normal atmosphere (atm)
Milimetre of mercury
(mm Hg)
Kilogram-
force per sq. m
(kgf/m
2
)
or
(mm H
2
O)
Poundal per sq. ft.
(pdl/ft
2
)
Pound-
force per sq. ft.
(lbf/ft
2
)
Inch of mercury
(in Hg)
Inch of water
(in H
2
O)
1 Millibar
(mb)
1
9.869 x 10
-4
0.750 06
10.197 2
67.197
2.0885 4
0.029 5300
0.401 463
1 Normal atmosphere (atm)
1.013 25
x 10
3
1
7.600 0
x 10
2
1.033 23
x 10
4
6.808 7
x 10
4
2.116 22
x 10
3
29.921 3
4.067 82
x 10
2
1 Milimetre of mercury
(mm Hg)
1.333 22
1.315 79
x 10
-3
1
13.595 1
89.589 8
2.784 50
0.039 3701
0.535 24
1 Kilogram-
force per
sq. m
(kgf/m
2
) or
(mm H
2
O)
0.098 066 5
9.678 4
x 10
-5
0.073 556
1
6.589 8
0.204 816
2.895 90
x 10
-3
0.039 370 1
1 Poundal per sq. ft.
(pdl/ft
2
)
0.014 881 6
1.468 70
x 10
-5
0.011 162 1
0.151 751
1
0.031 081 0
4.394 55
x 10
-4
5.9744
x 10
-3
1 Pound-force per sq. ft.
(lbf/ft
2
)
0.178 803
4.725 41
x 10
-4
0.359 131
4.882 43
32.1740
1
0.014 139 0
0.192 222
1 Inch of mercury
(in Hg)
33.863 9
0.033 421 1
25.4
3.453 16
x 10
2
2.275 55
x 10
0
70.726
1
13.595 1
1 Inch of water
(in H
2
O)
2.490 89
2.458 32
x 10
-3
1.868 32
25.4
1.673 80
x 10
2
5.202 3
0.073 556
1
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