Vacuum Pressure Conversion Charts (Absolute and Relative)
Perfect vacuum or 100% vacuum is a zero reference pressure. In practice, a perfect vacuum is impossible to obtain. The two tables below are for reference only when selecting vacuum pump related products. It is the sole responsibility of users who uses these tables to select their products. Any improper selection or use of the table may cause any damage or injury. Please consult with your own subject matter expert for advice on how to select appropriate vacuum.
Table 1 Vacuum Pressure Unit Conversion Chart (Absolute)
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Vacuum% ATM PSIA Torr in Hg KPa Bar mBar
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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
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Unit: kPa = bar x 100; mbar = bar x 1000;
Table 2 Vacuum Pressure Unit Conversion Chart (Relative)- Gauge
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Vacuum% ATM PSIG Torr in Hg KPa Bar mBar
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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
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Unit: kPa = bar x 100; mbar = bar x 1000;
Two charts can be found below in Figure 1 and Figure 2. At 40% Vacuum, the absolute vacuum pressure reads 17.95 in Hg while the absolute vacuum pressure is about 5.98 in Hg at 80% vacuum. Similarly in Figure 2, the gauge vacuum pressure is relative to atmosphere pressure (29.92 in Hg). Thus, at 40% vacuum, we can directly subtract the atmosphere pressure (22.9 in Hg) from the absolute pressure ( 17.95 - 29.92 = -11.97 in Hg gauge). At 80% vacuum, the relative vacuum can be calculated in the same way (5.98 - 29.92 = - 23.94 in Hg gauge).
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