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Vacuum Pressure Equivalence Table

Fluids Engineering and Design

Equivalence Table for Pressure/Vacuum Measurements (pressure reduction of 2 torr corresponds to 0.232% vacuum)

torr
mm Hg
mbar
(10-"MPa)
psi
inches
Hg
atm
% vacuum
760
1013
14.696
14.7)
29.92
1.0
0.0
750
1000
(1 bar)
14.5
29.5
0.987
1.3
735.6
981
14.2
28.9
0.968
1.9
700
934
13.5
27.6
0-921
7.9
600
800
11.6
23.6
0.789
21
500
667
9.7
19.7
0 .658
34
400
533
7.7
15.7
0.526
47
380
507
7.3
15.0
0.500
50
300
400
5.8
11.8
0.395
61
200
267
3.9
7.85
0.264
74
100
133.3
1.93
3.94
0.132
87
90
120
1.74
3.54
0.118
88
80
106.8
1.55
3.15
0.105
89.5
70
93.4
1.35
2.76
0.0921
90.8
60
80
1.16
2.36
0.0789
92.1
51.7
68.8
1.00
2.03
0.068
93.0
50
66.7
0.97
1. 97
0. 0658
93.5
40
53.3
0 . 77
1.57
0.0526
94.8
30
40.0
0.58
1.18
0.0395
96.1
25.4
33.8
0.4912
1.00
0.034
96.6
20
26.7
0.39
0.785
0.0264
97.4
10
13.33
0.193
0.394
0.0132
98.7
7.6
10.13
0.147
0. 299
0.01
99.0
1
1.33
0.01934
0.03937
0.00132
99.868

 

Micron
(10-3 torr)
mbar
(10-"MPa)
psi
inches
Hg
atm
% vacuum
750
1. 00
0.0145
0.0295
0.000987
99.9
100
0.133
0.00193
0.00394
0.000132
99.99
10
0.0133
0.000193
0.000394
0.0000132
99.999
1
0.00133
0.0000193
0.0000394
0.00000132
99.9999
0.1
0.00133
0.00000193
0.00000394 0.000000132
99.99999
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