Vacuum Pressure Unit Conversions Chart From Ism

Vacuum Pressures Unit Conversions Chart (Absolute)
ver 08-Aug-2017
ATM in HG
Torr kPa
% Vacuum (standard PSIA (inches bar mbar
(mm Hg) (SI unit)
atmosphere) Mercury)
0.00 1.00 14.70 760.00 29.92 101.33 1.01 1013.25
1.40 0.99 14.49 749.36 29.50 99.91 1.00 999.06
1.90 0.98 14.42 745.56 29.35 99.40 0.99 994.00
3.30 0.97 14.21 734.92 28.93 97.98 0.98 979.81
6.60 0.93 13.73 709.84 27.95 94.64 0.95 946.38
7.90 0.92 13.53 699.96 27.56 93.32 0.93 933.20
9.80 0.90 13.26 685.52 26.99 91.40 0.91 913.95
10.00 0.90 13.23 684.00 26.93 91.19 0.91 911.93
20.00 0.80 11.76 608.00 23.94 81.06 0.81 810.60
25.00 0.75 11.02 570.00 22.44 75.99 0.76 759.94
30.00 0.70 10.29 532.00 20.94 70.93 0.71 709.28
33.00 0.67 9.85 509.20 20.05 67.89 0.68 678.88
35.00 0.65 9.55 494.00 19.45 65.86 0.66 658.61
40.00 0.60 8.82 456.00 17.95 60.80 0.61 607.95
45.00 0.55 8.08 418.00 16.46 55.73 0.56 557.29
50.00 0.50 7.35 380.00 14.96 50.66 0.51 506.63
55.00 0.45 6.61 342.00 13.46 45.60 0.46 455.96
60.00 0.40 5.88 304.00 11.97 40.53 0.41 405.30
61.00 0.39 5.73 296.40 11.67 39.52 0.40 395.17
65.00 0.35 5.14 266.00 10.47 35.46 0.35 354.64
68.00 0.32 4.70 243.20 9.57 32.42 0.32 324.24
70.00 0.30 4.41 228.00 8.98 30.40 0.30 303.98
75.00 0.25 3.67 190.00 7.48 25.33 0.25 253.31
80.00 0.20 2.94 152.00 5.98 20.27 0.20 202.65
85.00 0.15 2.20 114.00 4.49 15.20 0.15 151.99
87.00 0.13 1.91 98.80 3.89 13.17 0.13 131.72
88.00 0.12 1.76 91.20 3.59 12.16 0.12 121.59
89.00 0.11 1.62 83.60 3.29 11.15 0.11 111.46
90.00 0.10 1.47 76.00 2.99 10.13 0.10 101.33
92.00 0.08 1.18 60.80 2.39 8.11 0.08 81.06
93.00 0.07 1.03 53.20 2.09 7.09 0.07 70.93
95.00 0.05 0.73 38.00 1.50 5.07 0.05 50.66
96.60 0.03 0.50 25.84 1.02 3.45 0.03 34.45
97.40 0.03 0.38 19.76 0.78 2.63 0.03 26.34
98.70 0.01 0.19 9.88 0.39 1.32 0.01 13.17
100.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Perfect vacuum or 100% vacuum is a zero reference pressure. In practice, a perfect vacuum is impossible to obtain.
kPa = bar x 100; mbar = bar x 1000
Vacuum Pressures Unit Conversions Chart (Relative)
ver 08-Aug-2017
ATM PSIG Torr (mm Hg) inches Hg kPa bar mbar

% Vacuum (standard negative negative negative negative negative negative
atmosphere) gauge gauge gauge gauge gauge gauge
0.00 1.00 0.00 0.00 0.00 0.00 0.00 0.00
1.40 0.99 - 0.21 - 10.64 - 0.42 - 1.42 -0.01 - 14.19
1.90 0.98 - 0.28 - 14.44 - 0.57 - 1.93 -0.02 - 19.25
3.30 0.97 - 0.48 - 25.08 - 0.99 - 3.34 -0.03 - 33.44
6.60 0.93 - 0.97 - 50.16 - 1.97 - 6.69 -0.07 - 66.87
7.90 0.92 - 1.16 - 60.04 - 2.36 - 8.00 -0.08 - 80.05
9.80 0.90 - 1.44 - 74.48 - 2.93 - 9.93 -0.10 - 99.30
10.00 0.90 - 1.47 - 76.00 - 2.99 - 10.13 -0.10 - 101.33
20.00 0.80 - 2.94 -152.00 - 5.98 - 20.27 -0.20 - 202.65
25.00 0.75 - 3.67 -190.00 - 7.48 - 25.33 -0.25 - 253.31
30.00 0.70 - 4.41 -228.00 - 8.98 - 30.40 -0.30 - 303.98
33.00 0.67 - 4.85 -250.80 - 9.87 - 33.44 -0.33 - 334.37
35.00 0.65 - 5.14 -266.00 - 10.47 - 35.46 -0.35 - 354.64
40.00 0.60 - 5.88 -304.00 - 11.97 - 40.53 -0.41 - 405.30
45.00 0.55 - 6.61 -342.00 - 13.46 - 45.60 -0.46 - 455.96
50.00 0.50 - 7.35 -380.00 - 14.96 - 50.66 -0.51 - 506.63
55.00 0.45 - 8.08 -418.00 - 16.46 - 55.73 -0.56 - 557.29
60.00 0.40 - 8.82 -456.00 - 17.95 - 60.80 -0.61 - 607.95
61.00 0.39 - 8.96 -463.60 - 18.25 - 61.81 -0.62 - 618.08
65.00 0.35 - 9.55 -494.00 - 19.45 - 65.86 -0.66 - 658.61
68.00 0.32 - 9.99 -516.80 - 20.35 - 68.90 -0.69 - 689.01
70.00 0.30 - 10.29 -532.00 - 20.94 - 70.93 -0.71 - 709.28
75.00 0.25 - 11.02 -570.00 - 22.44 - 75.99 -0.76 - 759.94
80.00 0.20 - 11.76 -608.00 - 23.94 - 81.06 -0.81 - 810.60
85.00 0.15 - 12.49 -646.00 - 25.43 - 86.13 -0.86 - 861.26
87.00 0.13 - 12.79 -661.20 - 26.03 - 88.15 -0.88 - 881.53
88.00 0.12 - 12.93 -668.80 - 26.33 - 89.17 -0.89 - 891.66
89.00 0.11 - 13.08 -676.40 - 26.63 - 90.18 -0.90 - 901.79
90.00 0.10 - 13.23 -684.00 - 26.93 - 91.19 -0.91 - 911.93
92.00 0.08 - 13.52 -699.20 - 27.53 - 93.22 -0.93 - 932.19
93.00 0.07 - 13.67 -706.80 - 27.83 - 94.23 -0.94 - 942.32
95.00 0.05 - 13.96 -722.00 - 28.43 - 96.26 -0.96 - 962.59
96.60 0.03 - 14.20 -734.16 - 28.90 - 97.88 -0.98 - 978.80
97.40 0.03 - 14.31 -740.24 - 29.14 - 98.69 -0.99 - 986.91
98.70 0.01 - 14.50 -750.12 - 29.53 -100.01 -1.00 -1000.08
100.00 0.00 - 14.70 -760.00 - 29.92 -101.33 -1.01 -1013.25
Perfect vacuum or 100% vacuum is a zero reference pressure. In practice, a perfect vacuum is impossible to obtain.
kPa = bar x 100; mbar = bar x 1000

Vacuum Pressure Unit Conversions Chart From Ism

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Vacuum Pressures Unit Conversions Chart (Absolute)

ATM PSIG Torr (mm Hg) inches Hg kPa bar mbar

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